Arbiter Systems 1092A Operation Manual

PASO ROBLES, CA 93446 U.S.A. WWW.ARBITER.COM

Reasonable effort was made to verify that all contents were accurate as of the time of publication. Check with Arbiter Systems at the address below for any revisions made since the original date of publication. Contact Information Arbiter Systems, Inc. 1324 Vendels Circle, Suite 121 Paso Robles, CA 93446 (805) 237-3831 Website: www.arbiter.com mailto: [email protected] mailto: [email protected] What This Manual Covers This manual describes the set up and operation of the Model 1092A/B/C and Model 1093A/B/C series satellite-controlled clocks. How to Determine Firmware Version Date To display the firmware date for your instrument (Models 1092B, 1093B and 1093C only) press and release the SETUP key at power-up and the date should appear briefly on the LCD display. To display the firmware date for Models 1092A, 1092C and 1093A, use the main RS-232 port (see page 10.2.15). To determine the current firmware date for this product, see the Arbiter website under the specific product name. Firmware Updates – Main Board Clocks with an main board require a ROM change to update firmware. This version of the manual is written for clocks with a ROM current with the publishing date of this manual (see page v). Where applicable, this update may include new documentation, such as a new version of this manual.

product manufactured or sold by Arbiter Systems except for the following limited warranty against defects in materials and workmanship on products manufactured by Arbiter Systems. Products manufactured by Arbiter Systems are guaranteed against defective materials and work- manship under normal use and service from the date of delivery for the period listed as Limited Lifetime1. The responsibility of Arbiter Systems under this warranty is limited to repair or replace- ment, at Arbiter Systems’ option, of any product found to be defective. Arbiter Systems shall have no liability under this warranty unless it receives written notice of any claimed defect. For warranty service or repair, products must be returned to a service facility designated by Arbiter Systems. Buyer shall prepay all shipping charges to Arbiter Systems, and Arbiter Systems shall pay shipping charges incurred in returning the product to Buyer. However, Buyer shall pay all shipping charges, duties and taxes for products returned to Buyer in a country other than the United States of America. THE WARRANTY SET FORTH HEREIN CONSTITUTES THE ONLY WARRANTY OBLIGA- TIONS OF ARBITER SYSTEMS, EXPRESSED OR IMPLIED, STATUTORY, BY OPERATION OF LAW, OR OTHERWISE. ARBITER SYSTEMS DISCLAIMS ANY WARRANTY OF MER- CHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, AND BUYER EXPRESSLY WAIVES ALL OTHER WARRANTIES. This limited warranty does not extend to any product, which has been subject to: 1. Improper use or application, abuse, or operation beyond its rated capacity, or contrary to the instructions in the operation and maintenance manuals (if any); 2. Accident; 3. Repair or maintenance performed by Buyer, except in accordance with the operation and maintenance manuals, if any, and any special instructions of Arbiter Systems; 4. Modification without the prior written authorization of Arbiter Systems (whether by the substitution of non-approved parts or otherwise). The remedies provided herein are Buyer’s sole and exclusive remedies. In no event shall Arbiter Systems be liable for direct, indirect, incidental or consequential damages (including loss of profits), whether based on contract, tort, or other legal theory. FOR THE FASTEST POSSIBLE SERVICE, PLEASE PROCEED AS FOLLOWS: 1. Notify Arbiter Systems, Inc., specifying the instrument model number and serial number and giving full details of the difficulty. Service data or instrument-return authorization will be provided upon receipt of this information. 2. If instrument return is authorized, forward prepaid to the manufacturer. If it is determined that the instrument is not covered by this warranty, an estimate will be made before the repair work begins, if requested. See Contact Information on page ii. 1“Limited Lifetime” means that Arbiter Systems will repair or replace the defective component as long as com- ponents are available and for no more than five years after the product has been deemed obsolete.

Chapter 2 Front and Rear Panels Chapter 3 Connecting Inlet Power, Input and Output Signals Chapter 4 Antenna and Cable Information Chapter 5 Setting Internal Jumpers Chapter 6 Startup and Basic Operation Chapter 7 The Setup Menus Chapter 8 Timing, IRIG-B and Pulses Chapter 9 Relay Contacts and Event Inputs Chapter 10 Serial Communications and Command Set Appendix A Specifications and Technical Details Appendix B Using a Surge Arrester Appendix C Options List Appendix D CE Mark Certification Appendix E Statement of Compliance Index Copyright Arbiter Systems Incorporated February 2016 All rights reserved. International copyright secured. PD0021000AH

1 1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Unpacking and Locating Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.4 Attaching Rack-Mount Ears to 1093A/B/C Series Clocks . . . . . . . . . . . . . . . 2 1.4.1 Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.4.2 Rack-Mount Ears for Model 1092A/B/C Series Clocks . . . . . . . . . . . . . 3 2 Front and Rear Panels 4 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Front Panel Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.1 Command Key Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.2 LED Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.3 LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2.4 Enabling and Disabling the Keypad and Display . . . . . . . . . . . . . . . . 6 2.3 Rear Panel Identification and Connectors . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3.1 Power Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3.2 Antenna Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3.3 Event Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3.4 RS-232 and RS-485 Communication Ports . . . . . . . . . . . . . . . . . . . . 8 2.3.5 Form C, Relay Contacts – Option 93 . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.6 Standard Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 Connecting Inlet Power, Input and Output Signals 10 3.1 Option 07, IEC-320 Power Inlet Module . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1.1 Cordsets and Plug Styles for Option 07 . . . . . . . . . . . . . . . . . . . . . 10 3.1.2 Option 07, Connecting Power to the 1093B . . . . . . . . . . . . . . . . . . . 10 3.2 Option 08, 10 to 60 VDC Terminal Power Strip . . . . . . . . . . . . . . . . . . . . . 11 3.2.1 Option 08, Connecting Inlet Power . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 Option 10, 110 to 350 VDC Terminal Power Strip . . . . . . . . . . . . . . . . . . . 11 3.3.1 Option 10, Connecting Inlet Power . . . . . . . . . . . . . . . . . . . . . . . . 12 3.4 Fuse Locations and Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.4.1 Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.5 Connecting Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.6 Connecting Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

14 4.1 GPS Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1.1 Mounting the Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1.2 Optional Antenna Mounting Bracket, Kit P/N AS0044600 . . . . . . . . . . . 15 4.2 Verifying Antenna and Cable Operation . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.2.1 Checking the Antenna Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.2.2 Power Supply Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.2.3 Checking the Antenna Resistance . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.3 GPS Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.3.1 Using the GPS Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.4 Technical Details on GPS Antennas and Cables . . . . . . . . . . . . . . . . . . . . . 18 4.4.1 Antenna Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5 Setting Internal Jumpers 21 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.2 Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.3 Main Board Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.3.1 Output Signal Type, JMP3 and JMP4 . . . . . . . . . . . . . . . . . . . . . . 22 5.3.2 Change Unmodulated IRIG-B to Programmable Pulse . . . . . . . . . . . . . 23 5.3.3 Change 1 PPS to Programmable Pulse . . . . . . . . . . . . . . . . . . . . . . 23 5.3.4 I/O Connector Used as Event Capture Input, JMP7 . . . . . . . . . . . . . . 23 5.3.5 Output Signal Select, JMP1 and JMP2 . . . . . . . . . . . . . . . . . . . . . 24 5.3.6 Data Backup Battery, JMP5 (Option 02) - Obsolete . . . . . . . . . . . . . . 24 5.3.7 RS-232 AUX Out, JMP6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6 Startup and Basic Operation 25 6.1 Initial Startup Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.1.1 Clock Time, Startup Mode – 1092B, 1093B/C . . . . . . . . . . . . . . . . . 26 6.2 Front Panel Indication – 1092B, 1093B/C . . . . . . . . . . . . . . . . . . . . . . . . 26 6.2.1 Display Indication at Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6.2.2 Other Display Indications When Unlocked . . . . . . . . . . . . . . . . . . . . 27 6.2.3 Status Display Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.2.4 Event/Deviation Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.2.5 IRIG-B Time Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.3 Clock Status Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.4 Time Display Modes – 1092B and 1093B/C . . . . . . . . . . . . . . . . . . . . . . . 28 6.4.1 Date and Time Display, Universal Time Coordinated (UTC) . . . . . . . . . 29 6.4.2 Time of Year Display, UTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.4.3 Date and Time Display, Local Time . . . . . . . . . . . . . . . . . . . . . . . 29 6.4.4 Time of Year Display, Local Time . . . . . . . . . . . . . . . . . . . . . . . . 29 6.4.5 Daylight Saving Time/Summer Time (DST) . . . . . . . . . . . . . . . . . . 30 6.5 Position Display Modes – 1092B, 1093B/C . . . . . . . . . . . . . . . . . . . . . . . . 30 6.5.1 Longitude Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.5.2 Latitude Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.5.3 Elevation Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

31 7.1 To Begin Configuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7.2 Setup Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7.2.1 Default Firmware Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7.2.2 Numeric Data Entry Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7.2.3 To Exit Setup Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 7.3 Setting the Main RS-232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 7.3.1 Setting Port Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 7.3.2 Setting the Broadcast Mode from Main RS-232 . . . . . . . . . . . . . . . . . 34 7.4 Setting the Local Hour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 7.4.1 Set Daylight Saving Time (DST) . . . . . . . . . . . . . . . . . . . . . . . . . 36 7.5 Setting Out of Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 7.6 Setting the Back Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.7 Setting System Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.8 Setting Programmable Pulse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.8.1 Entering Numerical Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.8.2 Programmable Pulse – Seconds–Per–Pulse Mode . . . . . . . . . . . . . . . . 40 7.8.3 Programmable Pulse – Pulse–Per–Hour Mode . . . . . . . . . . . . . . . . . . 41 7.8.4 Programmable Pulse – Pulse–Per–Day Mode . . . . . . . . . . . . . . . . . . 42 7.8.5 Programmable Pulse – Single Trigger . . . . . . . . . . . . . . . . . . . . . . 43 7.8.6 Programmable Pulse – Slow Code . . . . . . . . . . . . . . . . . . . . . . . . 44 7.8.7 Programmable Pulse – Pulse Polarity . . . . . . . . . . . . . . . . . . . . . . 44 7.9 Setting IRIG Time Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.10 Setting the Event or Deviation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.11 Setting the Auto Survey Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.11.1 Number of Fixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.12 Setting Position Hold ON or OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 7.13 Setting Option Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 8 Timing, IRIG-B and Pulses 49 8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 8.2 Timing Output Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 8.2.1 Inputs and Outputs – Port 1, Port 2, Port 3 . . . . . . . . . . . . . . . . . . . 50 8.2.2 Digital Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 8.2.3 Analog Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 8.3 Output Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.3.1 IRIG-B Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.3.2 Modulated and Unmodulated IRIG-B . . . . . . . . . . . . . . . . . . . . . . 52 8.3.3 IRIG-B IEEE 1344 Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.3.4 1 Pulse-per-Second (1 PPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.3.5 Programmable Pulse (PROG PULSE) . . . . . . . . . . . . . . . . . . . . . . 53 8.3.6 Programmable Pulse with 200-Volt FET, Setup . . . . . . . . . . . . . . . . . 53 8.3.7 Protecting the 200-Volt FET Connection . . . . . . . . . . . . . . . . . . . . 53 8.4 Connecting the Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8.4.1 Attaching Cables to Screw Terminals . . . . . . . . . . . . . . . . . . . . . . . 54 8.4.2 How Far Can I Run IRIG-B Cabling? . . . . . . . . . . . . . . . . . . . . . . 54

54 8.4.4 Connecting Unmodulated IRIG-B . . . . . . . . . . . . . . . . . . . . . . . . 55 8.4.5 Connecting Modulated IRIG-B . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.4.6 Wire Losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 8.4.7 Voltage Matching for Modulated IRIG-B . . . . . . . . . . . . . . . . . . . . 56 8.4.8 Cable Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 8.4.9 Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 9 Relay Contacts and Event Inputs 58 9.1 Relay Contacts – Option 93 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.1.2 Relay Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.2 Event Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.2.1 Event Timing Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.2.2 Event Timing Latency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.2.3 Deviation Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.2.4 Measurement Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.2.5 Event Timer Input Channel Configuration . . . . . . . . . . . . . . . . . . . . 59 9.2.6 Firmware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 9.2.7 Displaying Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 9.2.8 RS-232C Event Trapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.2.9 Event Trapping Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 10 Serial Communication and Command Set 62 10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 10.2 Command Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 10.2.1 Custom String Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 10.2.2 String Setup Examples and Tutorial . . . . . . . . . . . . . . . . . . . . . . . 66 10.2.3 Broadcast Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 10.2.4 Event Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 10.2.5 Status Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 10.2.6 Local / Daylight Saving Time Setup Commands . . . . . . . . . . . . . . . . 78 10.2.7 Front Panel Control Commands . . . . . . . . . . . . . . . . . . . . . . . . . 79 10.2.8 IRIG-B Data Output Commands . . . . . . . . . . . . . . . . . . . . . . . . . 80 10.2.9 Position Data Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 10.2.10Survey Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 10.2.11Date and Time Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 10.2.12Programmable Pulse Output Commands . . . . . . . . . . . . . . . . . . . . . 84 10.2.13Antenna System Delay Commands . . . . . . . . . . . . . . . . . . . . . . . . 85 10.2.14Out-of-Lock Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 10.2.15Miscellaneous Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 10.3 Communication Port Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

88 A.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 A.2 Receiver Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 A.2.1 Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 A.2.2 Timing Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 A.2.3 Position Accuracy (rms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 A.2.4 Satellite Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 A.2.5 Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 A.3 I/O Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 A.3.1 I/O Connectors – Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . 89 A.3.2 Standard Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 A.3.3 Option 03, Four Additional Configurable Outputs . . . . . . . . . . . . . . . 89 A.3.4 Input Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 A.3.5 Event Input, Option 98 – Main Board . . . . . . . . . . . . . . . . . . . . . . 90 A.3.6 Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 A.4 System Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 A.4.1 RS-232C Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 A.4.2 Broadcast Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 A.5 Antenna System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 A.5.1 Antenna Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 A.6 Operator Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 A.6.1 Setup Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 A.6.2 Setup Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 A.6.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 A.6.4 Display Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 A.6.5 Annunciators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 A.7 Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 A.7.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 A.7.2 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 A.8 Temperature and Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 A.9 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 A.9.1 Power Connector (Model 1093A/B/C) . . . . . . . . . . . . . . . . . . . . . . 92 A.9.2 Electro-Magnetic Interference (EMI) . . . . . . . . . . . . . . . . . . . . . . . 93 B Using a Surge Arrester 94 B.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 B.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 B.3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 B.3.1 Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 B.3.2 Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 B.3.3 Antenna and Clock Connections . . . . . . . . . . . . . . . . . . . . . . . . . 95 B.3.4 Weather Sealing the Connections . . . . . . . . . . . . . . . . . . . . . . . . . 95 B.3.5 Suggested Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 B.4 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

97 C.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 C.2 Option 01: Backlighted LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 C.2.1 General Description – 1092B & 1093B/C Only . . . . . . . . . . . . . . . . . 98 C.2.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 C.2.3 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 C.3 Option 02: GPS Battery Backup - Obsolete . . . . . . . . . . . . . . . . . . . . . . . 99 C.3.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 C.3.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 C.4 Option 03: Four Additional Outputs – Obsoleted by Opt36 . . . . . . . . . . . . . . 100 C.4.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 C.4.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 C.4.3 Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 C.5 Option 04: ON/OFF Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 C.6 Option 07: Inlet Power Supply Description . . . . . . . . . . . . . . . . . . . . . . . 105 C.6.1 85 to 264 VAC, 47 to 440 Hz, 110 to 370 VDC, IEC–320 Connector . . . . . 105 C.6.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 C.7 Option 08: Inlet Power Supply Description . . . . . . . . . . . . . . . . . . . . . . . 106 C.7.1 10 to 60 VDC ONLY, Terminal Power Strip, SWC . . . . . . . . . . . . . . . 106 C.7.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 C.8 Option 10: Inlet Power Supply Description . . . . . . . . . . . . . . . . . . . . . . . 107 C.8.1 110 to 350 VDC, 85 to 250 VAC, 47 to 440 Hz Terminal Power Strip, SWC . 107 C.8.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 C.9 Option 19: Second RS-232C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 108 C.9.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 C.9.2 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 C.10 Option 20A: Four Fiber Optic Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 109 C.11 Option 27: 8-Channel High Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 C.11.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 C.11.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 C.11.3 Option Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 C.11.4 Output Load and Loop Example – Unmodulated IRIG-B . . . . . . . . . . . 114 C.11.5 Connecting Load(s) to Output Bus . . . . . . . . . . . . . . . . . . . . . . . . 115 C.11.6 Output Loading (Modulated IRIG-B) . . . . . . . . . . . . . . . . . . . . . . 116 C.12 Option 28: Power System Time, Frequency and Phase Monitor . . . . . . . . . . . . 117 C.12.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 C.12.2 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 C.12.3 System Reference Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 C.12.4 Firmware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 C.12.5 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 C.12.6 Phase Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 C.12.7 Amplitude Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 C.12.8 Option 28–Specific RS-232 Commands . . . . . . . . . . . . . . . . . . . . . . 119 C.12.9 Option 28 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 C.13 Option 29: Four Additional Outputs; Dry Contacts; +25/50 VDC . . . . . . . . . . 126 C.13.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

C.13.3 Firmware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 C.13.4 Output Jumper Setting Changes . . . . . . . . . . . . . . . . . . . . . . . . . 129 C.14 Option 32/33: Internal NTP Server – Obsoleted by Opt34 . . . . . . . . . . . . . . . 131 C.14.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 C.14.2 Jumper Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 C.14.3 Firmware Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 C.14.4 General Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 C.14.5 Basic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 C.14.6 NTP Server Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 C.15 Option 34: NTP/PTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 C.15.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 C.15.2 Option 34 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 C.15.3 Web Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 C.15.4 SSH Console Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 C.15.5 SNMP Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 C.15.6 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 C.15.7 HTTPS/SSL Certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 C.15.8 Time Zone Format Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 C.16 Option 36: Four Configurable Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 182 C.16.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 C.16.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 C.16.3 Changing Outputs via Internal Settings . . . . . . . . . . . . . . . . . . . . . 182 C.17 Option 91: 1-Microsecond Accuracy, RAIM - Obsolete . . . . . . . . . . . . . . . . . 185 C.18 Option 92: IRIG-B Modulated Output . . . . . . . . . . . . . . . . . . . . . . . . . . 185 C.19 Option 93: Out-of-Lock Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 C.20 Option 94: RS-422/485 Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 C.21 Option 95: Four BNC Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 C.21.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 C.22 Option 96: Programmable Pulse Output . . . . . . . . . . . . . . . . . . . . . . . . . 186 C.23 Option 97: IRIG-B Output Reconfigured to Programmable Pulse . . . . . . . . . . . 187 C.24 Option 98: Event Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 D CE Mark Certification 188 D.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 E Statement of Compliance 190 E.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

1.1 Packaging of Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2 Attaching Rack-Mount Ears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 Model 1092A/B/C and 1093A/B/C Front Panel Description . . . . . . . . . . . . . . 4 2.2 Model 1092A/B/C and 1093A/B/C Rear Panel Description* . . . . . . . . . . . . . 7 2.3 Option 07 Power Supply Inlet Connector . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Option 08 Power Supply Inlet Connector . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.5 Option 10 Power Supply Inlet Connector . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.6 GPS Antenna Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.7 Communications Port Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.8 Relay Contact Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.9 Standard Input/Output Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 Option 07 Power Supply Inlet Description . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Option 08 Power Supply Inlet Description . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 Option 10 Power Supply Inlet Description . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 Antenna Assembly for Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 Antenna Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.3 Antenna Mounting with AS0044600 . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.4 GPS Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1 Main board and Jumper Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7.1 Main RS-232 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 7.2 Port Parameter Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 7.3 Broadcast Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 7.4 Local Hour Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 7.5 Auto Daylight Saving Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 7.6 Out-of-Lock Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 7.7 Back Light Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.8 System Delay Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.9 Programmable Pulse Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.10 Seconds–Per–Pulse Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 7.11 Pulse–Per–Hour Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 7.12 Pulse–Per–Day Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.13 Single Trigger Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7.14 Slow Code Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7.15 Pulse Polarity Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7.16 IRIG-B Time Data Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.17 Event/Deviation Mode Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.18 Survey Mode Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.19 Position Hold Mode Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 7.20 Option Control Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 8.1 Rear Panel Descriptions – optional outputs may be shown . . . . . . . . . . . . . . . 50 8.2 IRIG-B Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 9.1 Relay Contact Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 B.1 GPS Surge Arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 B.2 Suggested Mounting of the AS0094500 Surge Arrester . . . . . . . . . . . . . . . . . 96 C.1 Option 03 Jumper Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 C.2 Model 1093A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 C.3 Model 1093B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 C.4 Option 07 Power Supply Inlet Description . . . . . . . . . . . . . . . . . . . . . . . . 105 C.5 Option 08 Power Supply Inlet Description . . . . . . . . . . . . . . . . . . . . . . . . 106 C.6 Option 10 Power Supply Inlet Description . . . . . . . . . . . . . . . . . . . . . . . . 107 C.7 Option 20A Jumper Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 C.8 Option 27 Jumper Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 C.9 Option 29 Jumper Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 C.10 Option 29 Connector − Signal Locations . . . . . . . . . . . . . . . . . . . . . . . . . 130 C.11 Option 32/33 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 C.12 Option 32/33 Board, Jumper Locations . . . . . . . . . . . . . . . . . . . . . . . . . 133 C.13 Startup Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 C.14 System Configure Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 C.15 Configure HTTPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 C.16 Configure System Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 C.17 Update System Firmware Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 C.18 Rebooting the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 C.19 Checking Network Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 C.20 Configure Network Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 C.21 Configure VLAN Network Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 C.22 View Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 C.23 View SNMP Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 C.24 SNMP Configuration Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 C.25 PTP Status Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 C.26 PTP Configuration Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 C.27 NTP Status Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 C.28 NTP Configure Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 C.29 NTP Authentication Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 C.30 Contact and Version Information Pages . . . . . . . . . . . . . . . . . . . . . . . . . 155 C.31 SSH Console Interface – Startup Screen . . . . . . . . . . . . . . . . . . . . . . . . . 156

xv C.32 System Configure Page Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 C.33 Configure System Password Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . 158 C.34 Checking Network Status Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 C.35 Configure Network Settings Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . 160 C.36 View Operation Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 C.37 View SNMP Operation Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 C.38 PTP Status Page Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 C.39 NTP Status Page Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 C.40 NTP Configure Page Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 C.41 NTP Authentication Page Using SSH . . . . . . . . . . . . . . . . . . . . . . . . . . 164 C.42 Contact and Version Information Pages Using SSH . . . . . . . . . . . . . . . . . . . 165 C.43 Option 36 Jumper Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 C.44 Option 95 Rear-Panel Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

2.1 Command Key Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 Available IEC-320 Cordsets by Country . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 Fuse Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 Antenna Mounting Bracket Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 GPS Cable Data and Accessory Information . . . . . . . . . . . . . . . . . . . . . . . 19 5.1 Main Board Jumper Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.1 Front-Panel Setup Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7.2 Default Firmware Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 8.1 Drive Current vs. Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.2 IRIG-B Time Code Types Available . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.3 Programmable Pulse Modes and Features . . . . . . . . . . . . . . . . . . . . . . . . 53 10.1 Characters used with Custom Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 10.2 List of Possible Time Quality Levels, Ordinal 01 . . . . . . . . . . . . . . . . . . . . 65 10.3 List of True Time Quality Levels, Ordinal 02 . . . . . . . . . . . . . . . . . . . . . . 65 10.4 Short Table of ASCII Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 10.5 Fault Indications and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10.6 Survey (Sn) / Position-Hold Status (Pm) . . . . . . . . . . . . . . . . . . . . . . . . 77 10.7 Unlocked Time Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 10.8 Auto Survey Setup Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 10.9 Option Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 10.10Main RS-232 Port Pin Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 A.1 Setup Functions Listed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 A.2 Clock and Antenna Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 A.3 Clock and Shipping Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 A.4 Temperature and Humidity List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 C.1 Option 03 Signal Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 C.2 Output Connector Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 C.3 Option 19, Second RS-232 Port Pin Locations . . . . . . . . . . . . . . . . . . . . . . 108 C.4 Option 20A, Four Fiber Optic Output Configuration . . . . . . . . . . . . . . . . . . 110 C.5 Example, Output Load and Loop Distance Matrix . . . . . . . . . . . . . . . . . . . 114

xvii C.6 Option 28 B2 Broadcast, Time Deviation Values . . . . . . . . . . . . . . . . . . . . 122 C.7 Output Connectors and Setup Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . 128 C.8 Option 32/33 Jumper Truth Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 C.9 Null-Modem Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 C.10 Option 34 LED Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 C.11 Option 36 Output Connector Jumper Settings . . . . . . . . . . . . . . . . . . . . . . 184

1.1 Introduction This section will assist you with unpacking the clock from its shipping container; other parts and accessories shipped with the clock include: • 1093A/B/C GPS Clock (includes internal power supply) • 1092A/B/C GPS Clock (includes external power supply) • Antenna Cable, 50 feet with connectors • GPS Antenna • Rack-Mount Ears, 2 ea. (1093A/B/C only) • Instrument Manual 1.2 Precautions Mechanical Shock Note that the GPS antenna is small and smooth, and can be damaged if dropped. Use care when handling. Remember to store the antenna in a safe place before the final installation. Static Discharge Note that the Model 1092A/B/C and 1093A/B/C are electronic devices and use static-sensitive components in their operation. Therefore, use care when handling against static discharges. Generally, these components are protected in their normal situation, however some of these are accessible when the cover is removed. CAUTION Antenna Input Connector - Connect only the antenna cable coming from the antenna into this connector. The antenna input connector on the clock itself leads to the GPS receiver, which could be damaged from high voltage or a static discharge. To protect the GPS clock from electrical discharges during operation, consider the optional surge suppressor (Part no. AS0049000). For more information see Section 4.3.

1.3 Unpacking and Locating Accessories The Model 1093A/B/C, and included accessories, are packed between two closed-cell foam shells (see Figure 1.1). The Model 1092A/B/C series clocks are packed between layers of molded foam pieces. Carefully pull apart the two shells to extract the clock and accessories. Some of the accessories (i.e. antenna and rack-mount ears) are located in one of these shells for protection. In the diagram below, you can see how the GPS antenna and rack-mount ears are located in the closed-cell foam marked with the label that reads, ADDITIONAL PARTS INSIDE Figure 1.1: Packaging of Accessories Antenna cable, clock and operation manual are located between the two pieces of closed-cell foam. The rack-mount ears and antenna are embedded in the packing foam side labeled ADDI- TIONAL PARTS INSIDE. 1.4 Attaching Rack-Mount Ears to 1093A/B/C Series Clocks Each Model 1093A/B/C comes with two rack-mount ears suitable for mounting in a 19-inch system rack. These ears have four mounting holes, two of which are used to attach them to the sides of the clock. Since it is required to remove the M25 x 10 mm screws which attach the cover to the chassis, it may be good to attach the ears after first making any jumper configuration inside the clock. You will want to return to this section after making these changes. 1.4.1 Mounting Instructions 1. Using a Torx T25 driver or large slot screwdriver, remove the four M5x10 screws attaching the clock cover to the chassis. Use either a T25 or large slot screwdriver. 2. With the ear facing out from the front panel, match the lower set of holes of the ear to the cover/chassis and remount the M5x10 screws. 3. Repeat this procedure with the other side of the chassis and other ear.

3 Figure 1.2: Attaching Rack-Mount Ears NOTE: Before installing the rack-mount ears, you might want to determine if you need to set any internal jumpers. To install the rack-mount ears requires removal of the top cover, which would be a good time to make any changes to jumper settings. See Chapter 5, Setting Internal Jumpers, for information on doing this. 1.4.2 Rack-Mount Ears for Model 1092A/B/C Series Clocks Rack-mount ears are available for Model 1092A/B/C series clocks by ordering part number AS0044500. These ears are similar to the rack-mount ears for 1093A/B/C, however the ears are wider to accommodate the narrower width of these clocks. Check with Arbiter sales or your local representative to order these items.

2.1 Introduction This section identifies the connectors, controls, and displays found on the front and rear panels of the 1092A/B/C and 1093A/B/C series clocks. Take care to review all of these items prior to connecting cables to and configuring these products. Figure 2.1: Model 1092A/B/C and 1093A/B/C Front Panel Description

5 2.2 Front Panel Controls and Indicators The front panels of the Model 1092A/B/C and 1093A/B/C series clocks are different from one another because of the arrangement of LED indicators, display(s) and keypad. See Figure 2.1 to see the difference between these models. Of the 1092-series clocks, only the Model 1092B has an eight-button keypad. Because of the large LED display, the Model 1092C does not have the two-line by twenty-character LCD. All 1092-series clocks have the two annunciator LED’s. The Model 1093A has two annunciator LED’s; the Model 1093B adds to that the two-line by twenty-character LCD and eight-button keypad; the Model 1093C adds to the Model 1093B another nine-character, LED for higher visibility. ON/OFF switch is optional and can be added for a small charge. The upper row of keys are Information keys and the lower row of keys are configuration keys. In the figure below are illustrated the front panels of all of these clocks, illustrating all of the indicators and controls. Definitions for the annunciator LEDs are found below and definitions for keys in Table 2.1. Each of four upper keys allows you to view specific clock information, such as time and date, geographical position and instrument status. Each of the four lower keys allows you to configure various clock functions. To configure, see Chapter 7, The Setup Menus. 2.2.1 Command Key Definitions Table 2.1 subdivides all of the functions of the eight keys by name and function. Some of the keys have alternate functions as well. Key Function Alternate Function TIME time and date N/A POSITION latitude, longitude and eleva- tion N/A EVENT DEVIATION Event or Deviation N/A STATUS Clock and Receiver Status N/A SETUP setup mode move cursor left in data entry mode UP select upper value increase numerical value DOWN select lower value decrease numerical value ENTER install selected value move cursor right in data entry mode Table 2.1: Command Key Definitions 2.2.2 LED Status Indicators Two LED’s provide information about the operational status of the instrument. The Operate LED is green and the Out-of-Lock LED is red. For normal operation, with the clock locked and accurate, the green LED should be ON and the red LED should be OFF. The following definitions apply to these indicators:

• OPERATE: Illuminates green when power is being supplied to the clock. • OUT OF LOCK: Illuminates red when the clock has not yet synchronized, or has lost synchronization, with the GPS. 2.2.3 LCD Display The Model 1092B and the 1093B/C contain a liquid crystal display (LCD), which provides a 20- character by 2-line readout. The readout displays instrument status, time and event data. The readout is also used to display the current configuration of operation parameters. 2.2.4 Enabling and Disabling the Keypad and Display The Model 1093A/B/C and 1092A/B/C also have one or more RS-232 ports that provide control over the operation of the keypad and display (lock, enable, blank). Refer to Section 10.2.7, in the Serial Communication and Command Set, for a detailed description of RS-232 commands to control the front panel. The front-panel Pushbutton Keys are described below. Time Sets the display to the Time Display Mode. There are four modes of the time display available and repeated pressing of this key will cause the display to scroll through all four modes continuously. Changing the time display has no effect on the time data, which is output from rear-panel timing outputs. Position Cycles the display through the longitude, latitude, and elevation data readouts of the antenna location according to the most recent position fix. Event/Deviation Selects Event and/or Deviation Data recorded by the specific clock model; up to 400 event records or updated 1-PPS deviation data. Also, see Event Inputs in Chapters 5, 6, 8 and 9. Status Toggles the display between four status display modes: Clock, Receiver, DXCO and EEPROM, including the display of GPS satellite acquisition and synchronization. Setup Invokes a series of menus used to adjust configurable parameters within the clock. In numeric data entry mode, moves the cursor to the left. Up Used in conjunction with the Setup menus to adjust values upward, or to scroll upward through the available menu choices. Also assists in navigating through main Setup menus in normal order. Down Used in conjunction with the Setup menus to adjust values downward, or to scroll downward through available menu choices. Also assists in navigating through main Setup menus in reverse.

7 Enter Used for confirming changes made within Setup menus. Generally, pressing Enter also advances to the next parameter, or returns to the previous menu level. In numeric data entry mode, moves the cursor to the right. 2.3 Rear Panel Identification and Connectors This section contains information to assist you in identifying where to connect inlet power, the GPS antenna cable and all of the input and output cables on the Model 1092A/B/C and 1093A/B/C series clocks. ������� �� ���� ������� ���� ����������� ������ ������� ��� �������� �������� �������� ������� ���� ������� ������ ����� ������ ��� � ��� ������ � ������� ������ ������ ������ ����� ���� ����� ���� ��� ��� ���� ���� �� ���� ���� �� ��� ������� � ������� �� ��� ������� ���� ����������� ����� �������� �������� �������� ������ ���� ������� ������ ����� ������ ��� � ��� ���� ���� ��� ��� ������� ������ ����� � ��� ��� �� � � ������� ������� ������ ������ ������ ������ � Figure 2.2: Model 1092A/B/C and 1093A/B/C Rear Panel Description* *Note: Optional outputs may be shown. 2.3.1 Power Inlet To cover all of the possible inlet power conditions, the Model 1093A/B/C has three optional power supplies. The Model 1092A/B/C series clocks have an external power supply that connects to a 3.5 mm mini connector on the rear panel. Carefully examine the paperwork you received to make sure you have correctly identified the inlet connection. The supply types described below apply to the 1093A/B/C only. Option 07. IEC-320 supply with a range of 85 to 264 VAC, 47 to 440 Hz and 110 to 370 VDC (see Figure 2.3). Figure 2.3: Option 07 Power Supply Inlet Connector ���� ����������� ���� ������� ������ ������ ��� ������� �� ������� ��� ��� � ���� ���� �������� Option 08. 10 to 60 VDC ONLY, Terminal Power Strip with Surge Withstand Protect Circuitry (SWC) power (see Figure 2.4).

Figure 2.4: Option 08 Power Supply Inlet Connector �� � � � � � � � � � � � � � ����� � � � �������� ��� �� ��� ��� ��� ���� ����� ���� ������ � ��������� � �������� � � � � � � � � � � � � ����� ���� Option 10. 110 to 350 VDC and 85 to 250 VAC, 47 to 440 Hz, Terminal Power Strip with Surge Withstand Protect Circuitry (see Figure 2.5). Figure 2.5: Option 10 Power Supply Inlet Connector �� � � � � � � � � � � � � � ���� � � � �������� ���� �� ���� ��� ��� �� ���� ��� ��� �� ���� �� ����� ���� ������ � �������� � �������� � � � � � � � � � � � � ����� ���� 2.3.2 Antenna Input Figure 2.6 illustrates the female type-F, GPS antenna input connector, which also supplies 5 VDC to energize the antenna. Figure 2.6: GPS Antenna Connector ������� To check for this 5-volt signal, use a small multimeter and probe from the center pin (+) of the connector to the threads. Voltage range is 4.9 to 5.1 VDC. For further information, see Chapter 4, Antenna and Cable Information. 2.3.3 Event Input For timing external events based on the GPS-synchronized time, use either of two event input connectors: J4 (Standard I/O) and J6 (RS-232C). See Figure 5.1, which illustrates the location of these two connectors and the jumper location to select either connector. 2.3.4 RS-232 and RS-485 Communication Ports The Model 1092A/B/C and 1093A/B/C each have one standard and one optional communication port with RS-232 supported. RS-485 is supported only on the standard RS-232 port, not the optional RS-232 port. The RS-232 port does not use flow control and the RS-485 is transmit only (uses Transmit A and Transmit B, no Receive A and Receive B). Figure 2.7: Communications Port Connector �������

9 2.3.5 Form C, Relay Contacts – Option 93 Optional Form C relay contacts provide contact closure for an out-of-lock condition, or loss of inlet power. Installing Option 93 gives the Model 1092A/B/C and Model 1093A/B/C one set of Form C relay contacts with three contact points labeled ERR (Normally Closed), OK (Normally Open) and COM; “Normally” refers to the clock in the powered OFF state (illustrated in Figure 2.8). The information below gives the contact states for two situations: (1) faulted (including power off) and, (2) not faulted. 1. Faulted, or Power OFF – ERR to COM is shorted, OK to COM is open. 2. Not Faulted and Power On – ERR to COM is open, OK to COM shorted. Failsafe Essentially “Failsafe” mode occurs in the event of a power loss, and the Form C relay contacts are faulted. For additional information on Option 93, including specifications, see Chapter 9, Relay Contacts and Event Inputs and the Options List in Section C.19. Figure 2.8: Relay Contact Connector ���� ��� ��� ��� 2.3.6 Standard Inputs/Outputs Figure 2.9 illustrates the timing output connector for three separate timing signals: unmodulated IRIG-B, modulated IRIG-B and 1 Pulse Per Second (PPS). Viewed from the rear panel, they are labeled IRIG-B UNMOD, IRIG-B MOD1, 1 PPS from left to right. Multiple devices may be connected in parallel from a single output connector. For more information concerning how to connect timing outputsv11, see Chapter 8, Timing, IRIG-B and Pulses. Figure 2.9: Standard Input/Output Connectors ������ � � ������ � ���� ����� � ��� 1Main board requires Option 92 for modulated IRIG-B.

Output Signals Model 1092A/B/C Model 1092A/B/C series clocks include an external wall-mount power supply with an output of +9 VDC at 500 mA. The Model 1092A/B/C has an input voltage range from +8 to +15 VDC. Model 1093A/B/C To provide for a wide range of inlet power sources, the 1093B can be ordered with any one of three different power inlet modules. Each of the power inlet module connectors are illustrated here and also in Chapter 2. Take time to examine the power inlet module connection on your clock to verify that it is correct according to your order. Also, carefully check the voltage range at the inlet connector before connecting power to the clock. 3.1 Option 07, IEC-320 Power Inlet Module The Option 07, IEC-320 power inlet module, comes with power cord for the required country code. See Figure 3.1 below. Inlet Specifications: 85 to 264 VAC, 47 to 440 Hz, or 110 to 370 VDC, < 20 Watts Figure 3.1: Option 07 Power Supply Inlet Description ���� ����������� ���� ������� ������ ������ ��� ������� �� ������� ��� ��� � ���� ���� �������� 3.1.1 Cordsets and Plug Styles for Option 07 Make sure that the cordset matches the wall connector for your country. Table 3.1 lists IEC-320 mating cordsets by country and include plug style and specifications. 3.1.2 Option 07, Connecting Power to the 1093B Connect the IEC-320 plug on the cordset to the IEC-320 connector on the 1093B, and then connect the wall plug on the cordset into the wall socket.

11 No. Country Specification Rating P01 Continental Europe CEE 7/7 220V P02 Australia, NZ, PRC AS3112-1981 240V P03 U.K. BS 1363 240V P04 Denmark Afsnit 107-2-01 240V P05 India BS 546 220V P06 Israel SI 32 220V P07 Italy CEI 23-16/VII 1971 220V P08 Switzerland SEV 1011.1959 220V P09 North America and ROC NEMA 5-15P CSA C22.2#42 120V P10 Japan JIS8303 120V Table 3.1: Available IEC-320 Cordsets by Country 3.2 Option 08, 10 to 60 VDC Terminal Power Strip This option replaces the standard power supply with one accepting 10 to 60 VDC (only), < 20 VA typical. Replaces the standard IEC-320 inlet with a 3-pole terminal strip. Provides input surge protection (SWC) for compliance with ANSI C37.90-1 and IEC 801-4. Option 08 operates from common low-voltage battery systems, including 12, 24, and 48 VDC. Figure 3.2: Option 08 Power Supply Inlet Description � � � � � � � � � � � � � � ����� � � � �������� ��� �� ��� ��� ��� ���� ����� ���� ������� � �������� � ��������� � � � � � � � � � � � � ����� ���� 3.2.1 Option 08, Connecting Inlet Power When wiring station batteries to this power supply, make sure to first connect an earth ground wire to the terminal strip connector labeled “G” (for ground). After connecting a ground wire, connect the positive and negative leads from the station batteries to the corresponding Option 08 terminals. Figure 3.2 illustrates the Option 08 connector with terminals labeled as “+” and “–”. 3.3 Option 10, 110 to 350 VDC Terminal Power Strip Figure 3.3 illustrates Option 10, which replaces the standard IEC-320 inlet with a 3-pole terminal strip and provides input surge protection for compliance with ANSI C37.90-1 and IEC 801-4. Input voltages are: 85 to 250 VAC, 47 to 440 Hz, or 110 to 350 VDC, < 20 VA typical.

Figure 3.3: Option 10 Power Supply Inlet Description � � � � � � � � � � � � � � ���� � � � �������� ���� �� ���� ��� ��� �� ���� ��� ��� �� ���� �� ����� ���� ������� � �������� � �������� � � � � � � � � � � � � ����� ���� 3.3.1 Option 10, Connecting Inlet Power When wiring this power supply, make sure to first connect an earth ground wire to the terminal strip connector labeled “G” (for ground). After connecting a ground wire, connect the positive and negative leads from the station batteries to the corresponding Option 10 terminals. Positive and negative terminals are marked on the terminals as “+” and “–”. 3.4 Fuse Locations and Types Use the fusing table below for identifying the correct fuse for your option power supply. PS Option Arbiter P/N Fuse ID Size, mm 07 FU0001816 F1AL250V 5 x 20 08 FU0001419 T2AL250V 5 x 20 10 FU0001816 F1AL250V 5 x 20 Table 3.2: Fuse Chart 3.4.1 Replacing Fuses An IEC-320 power inlet connector includes a 1-A, 250-V fast acting fuse. The fuse is contained in a small compartment with a snap-fit latch, which also has a compartment for a spare fuse. Check Table 3.2 for replacement fuse information. The fuse compartment is located directly adjacent to the input connector socket, and can be opened by pulling both sides directly out away from the chassis, or by gently prying with a small flag-blade screwdriver. To replace the fuse, first disconnect the line cord from the power source and then remove the cord from the rear-panel IEC connector. The in-circuit fuse is the innermost one; inspect it to determine if it is open. As required, replace with fuse in the outer compartment, and replace the spent fuse. Option 08 and 10 fuses are located in a separate threaded compartment. To check the fuse, use a small flat-bladed screwdriver and turn the cover counter-clockwise. The cover and fuse should pop out. CAUTION: Replace fuse only with another of the same type and rating. See Table 3.2 above for the correct fuse configured for your option. To replace the fuse, first disconnect inlet power from the clock. Using a small flat-blade screw- driver, turn the fuse cover counter-clockwise (CCW) and it should pop outward. Replace fuse with the same size and type.

13 3.5 Connecting Output Signals Output signals may be connected through designated standard or option connector. For standard I/O connectors, see Section 2.3.6. Terminals are Phoenix-type with 5-mm spacing and will accept between 0.25 and 2.5–mm wire diameter. For Options that have terminals for output connectors, see Appendix C for details about those options and connectors. BNC connectors (on installed option boards) are female and require only connecting the (male) connector into it. To connect wires to any of the terminals, strip the insulation back to expose about 1/4” of bare wire and DO NOT tin the bare end. Insert the stripped wire into the terminal and turn the screw down to secure it in the connector. 3.6 Connecting Input Signals Input signals may be connected through the designated I/O terminals, the RS-232 connector and through an installed option connector designated as Input. For standard I/O connectors, see Section 2.3.6. Terminals are Phoenix-type with 5-mm spacing and will accept between 0.25 and 2.5–mm wire diameter. Option 95 has four BNC connectors and allows connection of an input signal for event timing besides the three output connectors. See specific option number in Appendix C for details about wiring and connectors. BNC connectors (on installed option boards) are female and require only connecting the (male) connector to it. To connect wires to any of the terminals, strip the insulation back to expose about 1/4–inch of bare wire and DO NOT tin the bare end. Insert the stripped wire into the terminal and turn the screw down to secure it in the connector.

The Model 1092A/B/C and 1093A/B/C come complete with the necessary hardware to be able to receive GPS signals: 50-feet of RG-6 cable and a GPS antenna. Longer cables are available. The antenna cable is connected between the female F connector on the antenna and the female F connector at the rear panel of the clock. This section should help you with installing the GPS antenna and antenna cable(s) and acces- sories. It should also be a source of information if you should need to trouble shoot the antenna cable system. 4.1 GPS Antenna Installation To properly receive GPS signals, the GPS antenna needs to be mounted clear of buildings and surrounding elements that may block the GPS signals being transmitted by the satellites. For complete coverage, the antenna needs to have a clear view of the sky from 10 degrees above the horizon to directly overhead for all points of the compass. Minimal installations, where the antenna is mounted in a less favorable location, may work however reception may be somewhat limited during certain hours of the day. 4.1.1 Mounting the Antenna The standard antenna is designed for pole mounting on a 26-mm pole (1.05-in. OD or 3/4-in. ID pipe), with either a standard 1-in. – 14 (approximately M25.4 x 1.81) marine-mount thread or a 3/4-in. NPT pipe thread. The Type F connector on the inside of the antenna is protected from direct exposure to the elements when the antenna is mounted in this way. This will extend the operational life of the antenna-to-cable interface. To mount the antenna, you will need a short piece of gray, 3/4–in. plastic pipe nipple that can be attached to a solid fixture. The piece of pipe nipple should be threaded up into the antenna receptacle after connecting the antenna cable to the Type F cable adapter. Arbiter Systems sells an antenna mounting kit (P/N AS0044600) that simplifies installation for a variety of locations. Figures 4.1, 4.2 and 4.3 illustrate several components for a suggested mounting method.

15 ���� ����� ���� ���� ������ ��������� ����� ��� ������� ������� ��� Figure 4.1: Antenna Assembly for Mounting Antenna mounting procedure: 1. Thread the RG-6 antenna cable through the plastic pipe. 2. Tighten the Type F male connector to the female connector on the antenna. WARNING! Do not spin the antenna onto cable. Attach and tighten using cable nut. 3. Thread the plastic pipe into the antenna mounting nut. 4. Mount the plastic pipe and antenna/cable assembly to a fixture. 4.1.2 Optional Antenna Mounting Bracket, Kit P/N AS0044600 The AS0044600 antenna mounting kit is designed specifically for use with antennas shipped with Arbiter Systems GPS-controlled clocks. The hardware included with the bracket allows installation of the antenna on a mast or pipe up to about 2–in. in diameter, and a different clamp may be substituted for use with a larger diameter pipe. Also, the bracket can be mounted to a wall, a roof, or any other flat surface. For complete details on this product request Installation Instructions for Arbiter Systems GPS Antenna Mounting Bracket on document number PD0024700A. All metallic hardware is stainless steel. Qty Description ASI P/N 1 GPS antenna mounting bracket HD0052700 1 U-bolt, 1-1/8–in., with 2 hex nuts HP0014700 1 3/4 x 4–in. threaded pipe, PVC, schedule 80 HP0014804 1 Hose clamp, worm drive HP0014900 1 Mounting bracket stabilizer HD0054200 Table 4.1: Antenna Mounting Bracket Parts List

Figure 4.2: Antenna Mounting Bracket �������� �������� �������� ������� ���������� ������ ������� ����� ������ ���� �� �� ��� �� ���� ���� ������� ����� Figure 4.3: Antenna Mounting with AS0044600

17 4.2 Verifying Antenna and Cable Operation A two-color operate LED, located at the base of the antenna, indicates proper antenna operation. GREEN indicates proper operation (i.e. the antenna is getting the correct voltage); AMBER indicates improper operation (i.e. the voltage is low). 4.2.1 Checking the Antenna Voltage The GPS clock provides +5 VDC to the GPS antenna, which is carried through the antenna cable. Nominal antenna current is 29 mA (nominal). Check the voltage at the antenna connector on the rear panel. Without a 5 VDC signal applied to the antenna, the GPS clock will not synchronize with the Global Positioning System and can generate an out-of-lock alarm, if the Out-of-Lock feature is enabled. 4.2.2 Power Supply Check The Antenna Voltage test (above) actually tests the main power supply voltage for all models of clocks. This signal should be between 4.9 and 5.1 VDC. 4.2.3 Checking the Antenna Resistance Checking the internal resistance of the Arbiter GPS antenna is not as useful as verifying the antenna current mentioned above. Antenna resistance measures several megohms with meter probes at one polarity and less so if you change the meter probe polarity. 4.3 GPS Surge Arrester Figure 4.4 illustrates the GPS surge arrester kit (P/N AS0094500), which is mounted in line with the antenna cable. The surge suppressor has two female F connectors, which are bidirectional, and two ground lugs with hardware for connecting to a solid ground. The surge arrester passes power to the GPS antenna, but does not draw power from the clock. ������� � �������� ������ ������������������ ����� ���������� Figure 4.4: GPS Surge Arrester 4.3.1 Using the GPS Surge Arrester Before installation, review the documentation on this device found in Appendix B. The AS0094500 surge arrester is weatherproof except for the F connectors, which may be sealed with rubber port seals or GE Silicone II compound.

4.4 Technical Details on GPS Antennas and Cables 4.4.1 Antenna Cable Length and Loss Considerations Standard Antenna Cable The standard antenna cable assembly included with the clock is constructed using a 15-meter (50-foot) length of RG-6 type low-loss coaxial cable, terminated with male Type F connectors. Optional lengths of RG-6 coax are separately available for longer runs; see Table 4.2, Cable Data and Accessory Information. Effects of Cable Parameters To receive GPS signals and properly operate the clock, the type and length of the cable are impor- tant. Due to their effect on specific parameters described in the following paragraphs, any changes to the length and/or type of antenna cable should be made carefully. Damaged cables may also affect performance. Cable Delay The velocity factor and the physical length of the cable determine cable delay. During the initial factory calibration of the clock, a value for cable delay (based upon the length and type of cable supplied) is entered into the clock memory. Firmware uses this figure to counteract the effect that the delay has upon GPS timing accuracy. The value entered for a standard 15-meter cable is 60 nanoseconds. For other cable options, the delay is tabulated below. The formula for calculating cable delay is: (4.1) T = λ 1 CKv + 1ns Where: T = Cable delay, in nanoseconds; λ = Cable length, in meters; C = Speed of light (3 × 108 meters per second); Kv = Nominal velocity of propagation (0.85). One nanosecond is added to the calculated value to account for the length and velocity factor of the short connecting cable inside of the clock. Attenuation Attenuation depends upon the cable length, and the loss per unit length. The total attenuation must be limited to 21 dB (maximum) at the GPS L1 frequency of 1575.42 MHz. Loss up to 42 dB can be accommodated with the separately available 21-dB in-line preamplifier (P/N AS0044700).

19 DC Resistance The cross-sectional area and length of the conductors in the cable determine the dc resistance. Since power to the RF preamplifier in the antenna is supplied via the antenna cable, excessive dc resistance will degrade performance. Because of the above factors, changes to the length and/or type of antenna cable should be made carefully. Damaged cables may also affect performance. Available Antenna Cables and Accessories for Longer Runs Arbiter Systems offers longer antenna cables for use with all models of clocks when the standard 15-meter (50-foot) cable is inadequate. For RG-6 cable runs greater than 250 feet, up to 500 feet, Arbiter offers a 21-dB in-line amplifier, P/N AS0044700. A larger RG-11 style cable is available (P/N WC0004900, 305-m / 1000-ft roll), that can be used for runs to 120 meters (400 feet) without the in-line preamplifier, or 240 meters (800 feet) with the AS0044700 amplifier. See a list of these accessories in Table 4.2. P/N Description Delay, ns Signal Level, dB CA0021315 15-m (50-ft) cable, RG-6 60 ns -5 dB CA0021330 30-m (100-ft) cable, RG-6 119 ns -9 dB CA0021345 45-m (150-ft) cable, RG-6 177 ns -13 dB CA0021360 60-m (200-ft) cable, RG-6 236 ns -17 dB CA0021375 75-m (250-ft) cable, RG-6 295 ns -21 dB WC0004900 305-m (1000-ft) roll RG-11 3.92 ns/m -17.5 dB/100 m AS0044800 RG-11 crimp tool and 25 connectors N/A N/A AS0044700 21-dB in-line amplifier 1 ns +21 dB Table 4.2: GPS Cable Data and Accessory Information Physical Protection When routing the antenna cable, protect it from physical damage, which may result from closing doors, falling objects, foot traffic, etc. Also, when routing around corners, allow for sufficient bend radius to prevent kinks. Extra length should be allowed at both ends of the cable to prevent tension on the connectors, which could cause damage or failure. Extra length is useful as a service loop, in the event that a connector needs replacement. Do not stretch the cable mid-air over any appreciable distance without support. Cable degra- dation or failure could result. Always leave a drip loop wherever the cable enters a structure, to prevent water from entering the structure via the cable jacket. The maximum temperature rating for the type of cable provided with the clock is 75◦C (167◦F). Exercise care when routing the cable near sources of heat to avoid cable damage.

Adjacent Signals Although the standard RG-6 style cable is triple-shielded and has excellent shielding properties, be cautious when routing near high power RF sources or alongside cables carrying high power RF, such as transmitter cables. In these applications, consider using RG-11 style cable (P/N WC0004900). Its quad-shielded design provides even more isolation. Antenna Power The RF preamplifier within the antenna requires 5 VDC at 15 mA nominal for operation. A power supply within the clock generates this voltage, which is applied to the antenna via the two conductors of the coaxial antenna cable. Avoid shorting the center conductor to the shield of the coaxial cable as it may damage the preamplifier. Conversely, a high-resistance connection or open circuit would deprive the preamplifier of power. Either a short-circuit or open-circuit condition in the antenna cable will render the clock inoperable. Prior to initial operation or if problems are suspected, perform the Antenna/Cable Operational Test Procedure described in Section 4.2. Connection to Antenna The male Type F connector on one end of the antenna cable mates with the female Type F connector on the antenna. Avoid placing mechanical stress on the cable attachment to the antenna. Connection to Clock The male Type F connector on the opposite end of the antenna cable connects to the female Type F connector on the rear panel of the Substation Clock. User-Supplied Antenna Cables Any RF cable meeting the requirements described above for loss (< 21 dB at 1575 MHz) and dc resistance (< 15 ohms total loop resistance) may be used with the clock. However, prior to using a non-standard antenna cable, verify proper installation by performing the Power Supply Test and Antenna Resistance Test above. For additional technical details concerning the GPS, GPS antennas and antenna cabling see Appendix A, Technical Details and Specifications.

5.1 Introduction Jumpers in the the 1092A/B/C and 1093A/B/C series clocks are normally set up at the factory according default settings, or according to the purchase order if requested. If it should be necessary to change any jumpers or to enable an alternate function, follow the instructions in this chapter. 5.2 Cover Removal To change jumper configurations, the instrument cover must be removed. Remove top cover as follows: 1. On all Models, disconnect the power cord. If equipped with Option 04 (power switch), first turn the power switch to OFF. 2. Using a T-25 driver, remove the four screws securing the cover (and rack-mount ears, if used). Lift the cover off. 5.3 Main Board Version Figure 5.1 indicates important jumper and test point locations on the main board in the Model 1092A/B/C and 1093A/B/C. Use this drawing to assist you with locating the jumpers you may want to configure. Jumpers are noted on the main board with a “JMP” prefix before the numbered location. For example, jumper 3 would have a label of JMP3 on the main board. Table 5.1 lists all of the current jumpers and their functions.

Figure 5.1: Main board and Jumper Locations 5.3.1 Output Signal Type, JMP3 and JMP4 Jumpers JMP3 and JMP4 may be installed to change the output signal type available at I/O connector J4.1 Before installing either of these jumpers, the drill-out via under the jumper location must be broken, using a small drill in a pin-vise or a sharp blade (such as an X-Acto knife). This disconnects the original signal from the buffer input. Note: Vias are marked by small targets at the Jumper, shown on Figure 5.1. 1Note: do not attempt to change these settings on boards whose serial number begins with the digits 9636 without first contacting the factory.

23 Jumper Name Function Special Note 1 JMP1 Output Signal Select if 200 V Open Drain Output Option is In- stalleda 2 JMP2 Output Signal Select if 200 V Open Drain Output Option is In- stalledb 3 JMP3 Output Signal Type IRIG-B Unmodulated* or Programmable Pulse 4 JMP4 Output Signal Type 1 PPS* or Programmable Pulse 5 JMP5 Data Backup Battery Obsolete* 6 JMP6 RS-232 Aux. Output RS-232 handshake* or Programmable Pulse Output 7 JMP7 Event Select Set to A for RS-232 Input, B for I/O aOption P/N, 1092optS001 or 1093optS001 bOption P/N, 1092optS001 or 1093optS001 Table 5.1: Main Board Jumper Table 5.3.2 Change Unmodulated IRIG-B to Programmable Pulse To change the output signal at pin 1 of J4 from IRIG-B unmodulated to Programmable Pulse, drill the via at JMP3 and install a zero-ohm jumper or a short piece of wire as shown on the PC board. 5.3.3 Change 1 PPS to Programmable Pulse To change the output signal at pin 5 of J4 from 1 PPS to Programmable Pulse, drill the via at JMP4 and install a zero-ohm jumper or a short piece of wire as shown on the PC board. 5.3.4 I/O Connector Used as Event Capture Input, JMP7 With modification, the Model 1092A/B/C and 1093A/B/C can accept an Event Capture input through connectors J4 or J6 (I/O and RS-232 respectively). See Figure 5.1. To select the RS-232 input from J6, set jumper JMP7 to the “A” position2. To select the I/O connector as the Event Input from J4, set jumper JMP7 to the “B” position. The event capture circuit will, once armed, capture the time of occurrence of the start bit of the next received character (see Section 7.10, entitled “Setting the Event or Deviation Modes”). Selection of one of the I/O connector pins for event capture (in place of the normal output signal) is done by a hardware modification, which is generally performed at the factory at the time of initial order. If this has been done, it will be indicated by the “EVENT INPUT” label above the appropriate pins of J6. Then, setting jumper JMP7 to the “B” position will enable an external 5 V CMOS-level signal to drive the event-capture circuit. 2Available on boards with serial numbers beginning with four digits greater than 9636. For boards with serial numbers beginning with 9636, this jumper is not available, and the only event input possible without a board modification is RS-232.

For RS-232C Event Trigger Operation, it is necessary to configure the clock as described in Section 9.2.8, “RS-232C Event Trapping.” 5.3.5 Output Signal Select, JMP1 and JMP2 JMP1 and JMP2 (available only if the 200 V open-drain outputs have been installed) select between the standard surge-protected 5 V CMOS drivers (position A) and the 200 V open-drain FET drivers (position B). JMP1 controls the signal at pin 1 (IRIG-B unmodulated, or Programmable Pulse) and JMP2 controls the signal at pin 5 (1 PPS, or Programmable Pulse). The drive of the open-drain FETs has been inverted, so that the signal at this pin (with an external pull-up) will have the same polarity in either mode of operation. Also note that the open-drain outputs do not have any protection against reverse polarity, transient over-voltage, or over-current. It is the responsibility of the user of this function to provide the necessary protection. Maximum recommended operating voltage is 150 VDC (200 V peak) and continuous operating current is 100 mA (power limited). 5.3.6 Data Backup Battery, JMP5 (Option 02) - Obsolete Jumper JMP5 is no longer used. All new GPS receivers incorporate an manganese-lithium recharge- able data backup battery. 5.3.7 RS-232 AUX Out, JMP6 The function of the AUX OUT line, pin 4 of J6, may be changed from a handshake line (position “A”) to Programmable Pulse, at RS-232 levels (position “B”). This may be used to provide a synchronization pulse, which can generate an interrupt in a host computer.

6.1 Initial Startup Sequence Before powering ON any of these clock models, make sure that the chassis cover is installed and if equipped with a power switch, that inlet power is properly connected to the power inlet connector. If the clock does not have a power switch, then the clock will begin the startup sequence when inlet power is connected to the rear panel. When the clock starts, several things should occur1 in the sequence listed below: • The two annunciator LED’s initially should flash momentarily, then the OPERATE LED and UNLOCKED LED should light steadily. • The LCD should display several introductory messages - see below (for 1092B and 1093B/C clocks only). • The Out-of-Lock Relay (Fault) will be in the out-of-lock (or faulted) position (if equipped with Option 93). • Eventually, the UNLOCKED LED should extinguish. • The Out-of-Lock Relay (Fault) should change to Locked (non-faulted) position after a few minutes. • The LCD should indicate that the clock is Locked (for 1092B and 1093B/C clocks). 1Startup behavior is based on Models 1092B and 1093B/C clocks with a display. Startup behavior for the 1092A and 1093A models have no visible display other than two annunciator LEDs. For the 1092A and 1093A, time and position (and other) data may be viewed if monitoring through a RS-232 port. Model 1092C has two annunciator LEDs and nine-digit LED time display. At startup, the 1092C time display will start counting from zero seconds until acquiring satellites, then begin displaying the time with day of year.

6.1.1 Clock Time, Startup Mode – 1092B, 1093B/C When the clock first starts, it will not indicate the correct time until it is locked to the GPS. Pressing the TIME key before the UNLOCKED LED is extinguished will produce the message: TIME NOT AVAILABLE For IRIG-B time, it will begin counting from zero, with the Julian Day also set to zero. This method was chosen so that there would be no mistake in interpreting that the clock was in startup mode. For example, the time could indicate as follows: 000:00:00:01 000:00:00:02 000:00:00:03 . . . 265:13:45:21 265:13:45:21 (these values chosen for illustrative purposes only) During a short period of time (from a few minutes to a few seconds) the displayed clock time may jump and add or lose some seconds as more satellites are acquired. This is normal, until the full set of ephemeris data is received by the GPS receiver from the GPS (satellites), when the time will be accurate. At this time, the Out-of-Lock LED will extinguish and the Out-of-Lock relay will close (if equipped with Option 93). 6.2 Front Panel Indication – 1092B, 1093B/C 6.2.1 Display Indication at Startup In the startup sequence, the LCD display should indicate clock status as follows: ARBITER SYSTEMS GPS SUBSTATION CLOCK followed by: COPYRIGHT (C) 2010 ARBITER SYSTEMS, INC. followed by: CLOCK STATUS STARTUP followed by: CLOCK STATUS UNLOCKED – MIN followed by: CLOCK STATUS NOT STABILIZED

27 After this, the second line of the status display should change to UNLOCKED, or LOCKED depending on the previous operation, inactivity or if the clock has been moved. During startup, the Unlocked LED should remain extinguished after the GPS receiver begins tracking satellites. 6.2.2 Other Display Indications When Unlocked Time Display TIME NOT AVAILABLE Position Display POSITION NOT AVAILABLE Event Display PLEASE WAIT! TIME ADJUSTMENTS Status Display GPS RECEIVER STATUS ACQUIRING SATS 6.2.3 Status Display Indications There are three indications when successively pressing the STATUS key. These are as follows: CLOCK STATUS STARTUP* *The second line will change between STARTUP, to UNLOCKED (with time), to NOT STABILIZED, to LOCKED–AUTO SURVEY, to LOCKED–POSITION HOLD. Press status key: GPS RECEIVER STATUS TRACKING: 00* *The number of tracked satellites can change from 0, 1, . . . , 12. Press status key: DCXO STATUS DEVIATION: ±nn.nn PPM Press status key: EEPROM STATUS CORR. ERRORS = 0 If the number of corrected (CORR.) errors begins to climb, contact the factory about replacing the EEPROM. 6.2.4 Event/Deviation Display There are separate displays when pressing the EVENT/DEVIATION key, depending on the setting. Successive events appear when repeatedly pressing the EVENT/DEVIATION key, or if configured

for DEVIATION, it will indicate the 1-PPS Deviation (updates once per second) and Sigma. If there are no records, the second line will indicate “NO DATA”. Event Display Ch A EVENT nnn ddd:hh:ss.sssssss Where: nnn = event number(001 to 400) ddd = day of year of the event(1 to 366) hh = hour of the event(00 to 23) mm = minute of the event(00 to 59) ss.sssssss = second and fractional seconds of the event Deviation Display 1 PPS: 0.00 µS SIGMA: 0.00 µS 6.2.5 IRIG-B Time Data IRIG-B time is sent out immediately, when the clock is powered ON, from any timing output port configured for IRIG-B as indicated above. Time will not be accurate until the clock is locked to the GPS. See also, check out-of-lock indication in Section 2.2.2 and Section 7.5. 6.3 Clock Status Display Mode When first applying power to the clock, the display will indicate several startup messages, then will revert to Clock Status mode condition called STARTUP. After a short time, while the GPS receiver begins collecting data from the GPS, it will indicate either UNLOCKED (XX Min), NOT STABILIZED, LOCKED–AUTO SURVEY, or LOCKED–POSITION HOLD. Various faults, if they exist, may be indicated as follows: • Not Stabilized • Out Of Lock • Time Error • VCXO Tuning Error • Receiver Failure For additional information on internal faults, please see Chapter 2, Front and Rear Panels, and Section 10.2.5, System Status command. 6.4 Time Display Modes – 1092B and 1093B/C After establishing GPS satellite synchronization, date and time information can be displayed on the front panel by pressing the TIME key and scrolling through the four available displays. Press this key to select the time display mode (UTC or Local) time data (Date/Time or Day of Year).

29 Time Definitions: www = Day of the Week (Sun – Sat); dd = the Day of the Month (1 – 31); ddd = the Day of Year (1 – 366); mmm = the Month (Jan – Dec); yyyy = the Year (e.g. 2007); hh = the Hour (00 – 23); mm = the Minute (00 – 59); ss = the Second (00 – 59) 6.4.1 Date and Time Display, Universal Time Coordinated (UTC) This mode displays UTC, in the Date and Time format, as maintained by the United States Naval Observatory (USNO), as described below: UTC DATE/TIME www dd mmm yyyy hh:mm:ss This mode displays UTC, Time of Year mode, without the application of daylight saving cor- rection and local offset. 6.4.2 Time of Year Display, UTC This mode also displays UTC, in Time of Year format, which differs from the previous format as follows: UTC DATE/TIME www yyyy ddd:hh:mm:ss This mode displays UTC, Time of Year mode, without the application of daylight saving cor- rection and local offset. NOTE: Daylight saving and local-offset have no effect on this display. 6.4.3 Date and Time Display, Local Time This mode displays the date and time after the daylight-saving correction and local offset have been applied, but in the same format as that of the Date and Time, UTC. LOCAL DATE/TIME www dd mmm yyyy hh:mm:ss 6.4.4 Time of Year Display, Local Time This mode displays the time of year after the daylight-saving correction and local offset have been applied, but in the same format as that of the Time of Year, UTC. LOCAL DATE/TIME www yyyy ddd:hh:mm:ss NOTE: Unless the daylight saving and local offset parameters have been set properly, this display may not reflect the correct local time.

6.4.5 Daylight Saving Time/Summer Time (DST) The Daylight Saving Time/Summer Time (DST) configuration feature allows expanded settings. The addition of AUTO allows the user to customize the DST settings to match the requirements of locations in either Northern or Southern latitudes. DST configuration may be changed through the serial port or through the front panel keypad. 6.5 Position Display Modes – 1092B, 1093B/C When the clock is first powered ON and acquiring satellites, the only position information available is the previous position, stored in the clock’s EEPROM. This position information reflects the location of the receiver as determined by the last position while locked to at least four satellites. Displayed position will be based on the most recent position fix. Press the front-panel button named POSITION to access longitude, latitude, and elevation data values. Repeatedly pressing the POSITION key scrolls the readout display continuously through these values. If pressed prior to acquisition of enough satellites to accurately determine and update position data, these numbers will reflect the receiver’s power-on defaults, or display the message, POSITION NOT AVAILABLE. Synchronization to a minimum of four satellites is necessary for precise determination of longi- tude, latitude, and elevation. When meeting this minimum satellite lock requirement, POSITION values will accurately correspond to the present antenna location. 6.5.1 Longitude Display ANTENNA LONGITUDE XXX◦ XX’ XX.XXX” W* Where: *W = WEST, or E = EAST 6.5.2 Latitude Display ANTENNA LATITUDE XX◦ XX’ XX.XXX” N* Where: *N = NORTH, or S = SOUTH 6.5.3 Elevation Display ANTENNA ELEVATION XXXXX.XX m WGS-84 Where the elevation is displayed referenced to the WGS-84 datum.

7.1 To Begin Configuring This section should guide you in configuring the Model 1092A/B/C and 1093A/B/C operation using the setup menus or RS-232 port(s). These menus allow you to configure the operation according to your preferences. Logically, use the setup menus after installing the clock for the first time, or changing any of the main board jumpers as described in Chapter 5. There are two available methods for configuring the 1092B and 1093B/C: (1) Using the lower row of keys on the front panel, and (2) remotely, using either the main RS-232 port or option RS-232 port. To configure Models 1092A/C and 1093A, you must use the RS-232 port(s). Both methods are described in this section. For complete information on configuring all clocks remotely through either serial port, please refer to Chapter 10, Serial Communication and Command Set. At the end of each setup menu section are references to the corresponding RS-232 commands for configuring these functions. Table 7.1 lists the various menus used to configure the operation of these clock models. Press the setup key to enter the clock configuration menus, starting with the main RS-232 port parameters. ����� ���� �� ����� SETUP: Press the setup key repeatedly to scroll through the main menus. Also, after pressing SETUP once, you can press the UP or DOWN keys to scroll the menus. In numeric data entry mode, pressing SETUP moves the cursor to the left. ENTER: Press the Enter key to confirm changes made within setup menus. Generally, pressing ENTER also advances the next parameter, or returns to the previous menu level. In numeric data entry mode, pressing ENTER moves the cursor to the right. UP: Press the UP key, within the setup menus, to adjust numerical values upward, or to scroll upward through the available menu choices. The UP key also assists in navigating through main Setup Menus in normal order. DOWN: Press the DOWN key, within the setup menu, to adjust numerical values downward, or to scroll downward through available menu choices. Also assists in navigating through main Setup menus in reverse order.

7.2 Setup Menus No. Setup Menus Setup Items 1 Set Main RS-232? Main RS-232 Port Parameters and Broadcast 2 Set Local Hour? Set Local Offset, Daylight Saving mode 3 Set Out-Of-Lock? Set Time Interval Before Alarm 4 Set Back Light? Set to ON, OFF or AUTO 5 Set System Delays? Set Antenna Cable Delay in Nanoseconds 6 Set Prog. Pulse? Set Mode, Pulse Width and Time Zone 7 Set IRIG Time Data? Set IRIG-B Time Zone and IEEE-1344 8 Set Event/Deviation? Set for Event, or 1–PPS Deviation 9 Set Auto Survey? Set Survey mode 10 Set Position Hold? Set ON or OFF 11 Set Option Control? Set Main board and Aux. board options Table 7.1: Front-Panel Setup Menus 7.2.1 Default Firmware Settings When shipped from the factory, and unless specified otherwise, all models will be configured with default settings. Most users elect to modify the clock settings to fit their locale and desired opera- tion. Default settings are listed in Table 7.2. Menu Item Default Menu Item Default Main RS-232 9600, 8, N, 1 Local Offset & DST none, OFF Out-of-Lock 01 minute Backlight Auto System Delays 60 ns Prog Pulse Sec. per Pulse IRIG-B Time Data UTC, 1344 OFF Event/Deviation 1 PPS Deviation Auto Survey Power On Survey Position Hold ON Option Control None – – Table 7.2: Default Firmware Settings 7.2.2 Numeric Data Entry Mode Numeric data entry mode is activated anytime you enter a menu that requires a change in numerical value and press either the UP or DOWN key to change the digit value. When in this mode, the function of the SETUP and ENTER keys change to give left and right cursor control.

33 7.2.3 To Exit Setup Menus To exit any configuration menu without saving, press any of the upper row of keys before pressing ENTER (which installs a new value). To return to the configuration menus, press SETUP again. If you make a configuration error, you can scroll through the menus again and press ENTER when you find the menu you want to change. 7.3 Setting the Main RS-232 Port Press SETUP key to configure the main RS-232 port, and press the ENTER key to begin setting up the RS-232 port parameters (See Figure 7.1). To set up the broadcast mode, press SETUP and skip to Section 7.3.2 below. NOTE: port settings may not be changed in the 1092A/C and 1093A series clocks since they do not have a keypad, and there are no port setting commands. ��� � � � � � � � � � � � � ���� ������� ����� ����� ���� � � � � � � � � � ���� ������ ����� ����� ��� ���� ����� �������������� ��� ���� �� ���������� ����� Figure 7.1: Main RS-232 Setup

7.3.1 Setting Port Parameters The “Set Port Config” menu allows you to configure any of the RS-232 port parameters from the front panel. Use the UP and DOWN keys to adjust the parameter values. For RS-232 command, Port parameters may not be changed from RS-232C ports. They may only be changed with Models 1092B and 1093B/C from front-panel interface. ��� � � � � � � � � � � � � � � � � � � ����� ����� ����� ����� � � � � �� ���� ����� � �� ��� � � � � � � � � � � � � � � � � � ���� ����� ���� ���� � �� � ���� ����� ����� � ����� � ���� � ���� � ���� ��� � � � � � � � � � � � ���� ������� ���� ������ � � � � ���� ����� �� � ��� � � � � � � � � � � � � � � � � � � � � � � � ������� ������� � � ��� ����� ��� ���� ���� �� � �������� ������� ���� �� ���� �� ���� �� ���� �� Figure 7.2: Port Parameter Setup 7.3.2 Setting the Broadcast Mode from Main RS-232 The “Set Broadcast Mode” menu allows you to configure any of these clock models to broadcast ASCII time/date-related data from the available RS-232 ports. With the UP/DOWN keys select the desired broadcast mode and press ENTER to immediately start the broadcast. For RS-232 command, see Section 10.2.3. ��� � � � � � � � � � � � � � � � ���������� ����� ��� � � � � � ��������� ����� ����������� ���� ����� ����� � ��� ������ ��������� ���������� ���������� ���������� ���������� ���� ����� ���������� ������ ��������� ������ ���� ��������� ����� ��� ��������� ����� ��� ����������� ���� � � � �������� ������� ���� �� Figure 7.3: Broadcast Setup

35 7.4 Setting the Local Hour Use “Set Local Hour” to set the offset in time from UTC to your locale and any Daylight Saving settings if they apply. Offsets may be adjusted in 15-minute increments, up to plus or minus 12 hours. Daylight Saving is adjusted for start and stop times, based on month, week of month, day and time of day. Use this menu to set up basic DST adjustment. For RS-232 command, see Section 10.2.6. ��� � � � � � � � � � � � ������ ����� ���� �� ����� ����� ��� � � � � � � ������ ������� �������� � �� � ����� ����� ��� ���������� ����� � � � � � � � � � � � � � � � � ��� ����� ������ � � � � � � � � � ������ � � � � � � �� � ������ ���� �� ���� ���� �� � �� �������� ������� Figure 7.4: Local Hour Setup

7.4.1 Set Daylight Saving Time (DST) Use the “Set Daylight Saving Time” menu to configure the one-hour offset to “Local Hour” settings. For automatic changeover, use the AUTO setting explained above. Make sure to determine the changeover requirements in your locale before trying to adjust the settings. The default setup is for North America, where DST begins on the second Sunday of March at 2 am and ends on the first Sunday of November at 2 am. Go through each setting and verify that the settings are valid. To adjust and install values, press the UP/DOWN keys to adjust the desired value and ENTER key to install that value and proceed to the next setting. For RS-232 command, see Section 10.2.6. ���� � ���������� ����� � � � � � � � � � � � � � � � � � � ���� ����� ����� ���������� � � � � � ������ ����� ��� ���������� � � � � � ������ ������� ���� ��� � ��� � ���� ����� � ������ � � ����� ���� �� ���� �� ���� ���������� � � � � � ������ ������� ��� ��� � ���� � ��� ���� �� ���������� � � � � � ������ ������ ���� ��� ��� ��� ����� ���� ���� ���� ���� ���� ����� ������� ����� ���������� � � � � � � � ����� ���� ��� ���������� � � � � � � � ����� ������� ���� ��� � ��� � ���� ����� � ������ � ����� ���������� � � � � � � � ����� ������� ��� ��� ���� � ��� ���������� � � � � � � � ����� ������ ��� ��� ��� ��� ����� ���� ��� ����� ���� ���� ����� ������ ������ � � ������� ������� ���� �� ���� �� ���� �� ���� �� ���� �� ����� ����� ����� ����� ����� ����� ����� ����� ���� �� ���� �� Figure 7.5: Auto Daylight Saving Setup

37 7.5 Setting Out of Lock Use the “Set Out of Lock” feature to control how the clock responds to an out-of-lock condition. Out of lock means that the GPS receiver in the clock is no longer tracking any satellites and that the time may drift according to characteristics of the internal clock and environmental conditions. Adjust these settings so that, in the event of an out-of-lock condition, you will be notified in a reasonable amount of time. The default setting is for the clock to alarm after being unlocked for a period of one minute. Unlocked indications include the red unlocked LED being ON, and the optional out-of-lock relay (Option 93) switching to the unlocked, or faulted, condition. For RS-232 command, see Section 10.2.14. “Extend Relay Start” increases the time for the clock to change from an unlocked to a locked indication, thereby increasing clock stability at startup. Normally at startup, the clock waits until the GPS receiver is tracking at least four satellites before it will indicate that the signal is accurate and changes to a Locked” condition. To extend the out-of-lock indication for a few minutes longer, select “Yes” to the selection, “Extend Relay Start.” ���� � � � � � � � � � ������������ ����� ����� ��� � � � � � � � � � ������������ ����� ���� � � �� ��� ��������� � �� ��� � ��������� � ��� ���� ����� ������ ������ ������� ��� � � ������� ������� ���� �� ������ ������ ������ ��� �� ��� � � ����� � �� ���� �� ����� Figure 7.6: Out-of-Lock Setup

7.6 Setting the Back Light If the optional back light (Option 01) is installed in the clock, use the “Set Back Light” menu to configure how the back light operates. If back light is not installed, then the “Set Back Light” menu will have no effect. Settings are either (1) Back light OFF, (2) Back light ON, or (3) Back light AUTO. In the Auto setting, the back light will operate for approximately 30 seconds before switching OFF. For RS-232 command, see Section 10.2.7. ��� � � � � � � � � � � � � ���� ������ ����� ����� ���� � � � � � � � � � � � � ����� ������ ���� ����� � ��� ����� ����� ���� ���� ����� �� ���� ����� ���� � � ������� ���� �� ����� Figure 7.7: Back Light Setup 7.7 Setting System Delays Use the “Set System Delays” menu to set the delay of the GPS signal received at the GPS antenna until it reaches the GPS receiver. The delay in nanoseconds (10−9 seconds) is a product of the length of the cable and the its velocity factor. Without compensating for the cable delay, the time would be slow by this amount. For RS-232 command, see Section 10.2.13. ���� � � � � ������ ������� ����� ����� ��� � � � � � � � � � ����� ������ ������ � � � � � � � ������� �� ������ � ������� � ������ � �� ������� ���� �� ����� Figure 7.8: System Delay Setup

39 7.8 Setting Programmable Pulse Mode Use the “Set Prog. Pulse” menu to set up one of the many pulse modes, in which you can broadcast a pulse over one of the standard outputs (I/O) at a predetermined interval or rate. Also, there is a “pulse-per-day” mode and a “pulse-per-year” mode. Programming includes adjusting the pulse width, from a minimum of 10 milliseconds to 600 seconds, depending on the application, and also allows you to configure the pulse to occur at either UTC or Local time where applicable. For RS-232 command, see Section 10.2.12. ��� � � � � � � � � � � ����� ������ ����� ����� ����� ����� � � � � ����� ���� ���� ������ ���� �� ��� ��������� ���� ��������� ���� ����� ���� ���� ����� ���� ������ �������� ����� ��� ���� ����� ��� ����� ���� ��� ������ � � � ������� ����� Figure 7.9: Programmable Pulse Setup 7.8.1 Entering Numerical Values When installing numerical values first use the UP/DOWN keys to change the digits and then SETUP and ENTER to move the cursor left or right. Then, use the UP/DOWN keys as before to change digits. To complete the installation after you have configured the numerical value, keep pressing the ENTER key to move the cursor to the right and exit the menu.

7.8.2 Programmable Pulse – Seconds–Per–Pulse Mode Use the “Seconds–Per–Pulse” mode to generate a pulse every X number of seconds, from 1 to 60,000 seconds, and a Pulse Width of from 10 milliseconds to 600 seconds. Refer to Section 7.8 above for additional detail on the Programmable Pulse mode. For RS-232 command, see Section 10.2.12. ��� � � � � � � � � � � ����� ������ ����� ����� ������ ����� � � � � ����� ���� ���� ������ ���� �� � � � ���� � � ����� ������ � � ����� ����� � ������ ������ � ������� ���� � � ���� ��� ������ � � � � � � � � � � ����� ���� ����� � ������ ������ ��� �� ������ ����� ���� � ��� ��� ���� � � �������� ������� ��� ��������� ��� ��������� ���� ����� ���� ���� ����� ���� ������ �������� ����� ���� ���� ������ ��� ����� ���� ���� ������ � ���� �� ���� �� ���� �� ����� ����� ����� ����� Figure 7.10: Seconds–Per–Pulse Setup

41 7.8.3 Programmable Pulse – Pulse–Per–Hour Mode Use the “Pulse–Per–Hour” mode to generate a pulse every hour, at the number of specified sec- onds (from 0 to 3599 seconds) after the hour. Refer to Section 7.8 above for additional detail on the programmable pulse modes, and entering numerical values. For RS-232 command, see Section 10.2.12. ��� � � � � � � � � � � ����� ������ ����� ����� ����� ����� � � � � ����� � � � ����� ���� ����� ���� �� � � � ���� � � ����� ������ � � ����� ������ � ������ ������ � ������� ���� ���� ������ � ����� � � � � � � � � � � � � ����� ���� ����� � ���� ������ ��� �� ������ ����� ���� � ��� ��� ���� � � ������� ������� ��� ��������� ��� ��������� ���� ����� ���� ����� ����� ���� ������ �������� ����� ���� ���� ������ ��� ����� ���� ���� ������ � ����� ����� ����� ����� ���� �� ���� �� ���� �� Figure 7.11: Pulse–Per–Hour Setup

7.8.4 Programmable Pulse – Pulse–Per–Day Mode Use the “Pulse–Per–Day” mode to generate a pulse every day, at the specified hour, minute, second and fractional seconds. Refer to Section 7.8 above for additional detail on the Programmable Pulse mode, and entering numerical values. For RS-232 command, see Section 10.2.12. ���� � � � � � � � � � � ����� ������ ����� ����� ����� ����� � � � � ����� � � � ����� ���� ���� ���� �� � � � ���� � � ����� ������ � � ����� ����� � ������ ������ � ������� � � � � � � ���� ������ ����� � � � � � � � � � � � ����� �� �� � ��� ������� ��� ��� ������ ����� ���� � ��� ��� ���� � �� ������� ������� � � � � � � ���� ������ ����� � � � � � � � � � � � � � � � ����� �� �� � ��� � � � � � � ���� ������ ����� � � � � � � � � � � � � � � � ����� �� �� � ��� � � � � � � ���� ������ ����� � � � � � � � � � � � � � � ������ �� �� � ��� ��� ��������� ���� ��������� ����� ���� ���� ����� ���� ���� ������� �������� ����� ��� ���� ������ ��� ����� ���� ���� ������ � ���� �� ���� �� ���� �� ���� �� ���� �� ���� �� ����� ����� ����� ����� ����� ����� ����� Figure 7.12: Pulse–Per–Day Setup

43 7.8.5 Programmable Pulse – Single Trigger Use the “Single Trigger” mode to generate a pulse once per year at the specified Julian Day, hour, minute, second and fractional seconds. For reference, many calendars indicate the Julian Day. Refer to Section 7.8 above for additional detail on the Programmable Pulse mode, and entering numerical values. For RS-232 command, see Section 10.2.12. ��� � � � � � � � � ���� ������ ����� ����� ����� ����� � � � � ����� � � � � ������ �������� ���� �� � � � ��� � � ������ ������ � � ����� ����� � ������ ������ � ������� � � � � ���� ������� ����� � � � � � � � � � � � ����� �� ���� �� �� � ��� ������� ��� ��� ������ ����� ���� � ��� ��� ���� �� � ������� ������� � � � � ���� ������� ����� � � � � � � � � � � � � � � � ����� �� �� � ��� � � � � ���� ������� ����� � � � � � � � � � � � � � � � ����� �� �� � ��� � � � � ���� ������� ����� � � � � � � � � � � � � � � ������ �� �� � ��� � � � � ���� ������� ����� � � � � � � � � � � � ���� ��� ���� �� ��� � ���� ��� ��������� ��� ��������� ���� ����� ���� ���� ���� ���� ������ �������� ����� ���� ���� ����� ���� ����� ���� ��� ������ � ���� �� ���� �� ���� �� ���� �� ���� �� ����� ����� ����� ����� ����� ����� ����� ����� Figure 7.13: Single Trigger Setup

7.8.6 Programmable Pulse – Slow Code The “Slow Code” mode causes the output voltage to be held high and go low for six seconds on the day, four seconds on the hour and two seconds on the minute. For RS-232 command, see Section 10.2.12. ���� � � � � � � � � ���� ������ ����� ����� ����� ����� � � � � ����� � � � � ����� ���� ���� ���� �� ����� ��� ��������� ��� ��������� ���� ����� ���� ���� ����� ���� ������ �������� ����� ���� ���� ������ ��� ����� ���� ���� ������ � � � ������� Figure 7.14: Slow Code Setup 7.8.7 Programmable Pulse – Pulse Polarity Use “Pulse Polarity” to change the pulse’s OFF-to-ON behavior as follows: 1. Positive: the voltage is held low (0 VDC) when the pulse is off and transitions high (5 VDC) when on. 2. Negative: the voltage is held high (5 VDC) when the pulse is off and transitions low (0 VDC) when on. To set up the pulse polarity, first set up the programmable pulse mode (e.g. Single Trigger) and then go back into the Prog Pulse menu and set up the polarity separately. For RS-232 command, see Section 10.2.12. ��� � � � � � � � � ����� ������ ����� ����� ����� ����� � � � � ����� � � � � � � � ��� � ��������� ��� ��������� ��� ��������� ����� ���� ���� ���� ���� ���� ������� �������� ������ ��� ���� ����� ��� ����� ���� ��� ������ � � �� ������� ���� �� ����� Figure 7.15: Pulse Polarity Setup

45 7.9 Setting IRIG Time Data Use the “Set IRIG Time Data” menu to adjust the time for IRIG-B Time Data from UTC to Local, and to turn ON or OFF the IEEE-1344 extension. The IEEE-1344 extension controls some additional information contained in the IRIG-B time code (see Section 8.3.3). For RS-232 command, see Section 10.2.8. ���� � � � � � ���� ���� ����� ����� ����� ������� ��� �� ����� � ����� ���� ����� �� ��� ��� ��� � ���� �� ����� ������� � � � � � ���� ���� � � � � � � � � � � � � ����� ��� �� ��� � � � ������� ���� �� ����� Figure 7.16: IRIG-B Time Data Setup 7.10 Setting the Event or Deviation Modes Use the “Event/Deviation” mode to capture an event (input signal) at any of the configured ports (see Sections 5.3.4). Configure for either event timing (up to 400 stored events) or one pulse-per- second (1 PPS) deviation, including sigma (see Section 9.2.3 for details on the principle of deviation measurement). For RS-232 command, see Section 10.2.4. ���� � ���������������� ����� ����� ������ � � � � �� �� ����� � � � � � ��� �� � ��� ��� ����� ����� ���� ��� � ���� �� ����� � � � ������ �� �� ����� � � � � �� �� � � ��� ���� ������ ���� ���� ���� � � �� ������� ������� ���� �� ����� ���� ������ ������� ������ Figure 7.17: Event/Deviation Mode Setup

7.11 Setting the Auto Survey Mode Use one of the Auto Survey modes to control how and when the clock determines position infor- mation. The accuracy of the position (and indirectly, time) is based on averaging the assigned number of position fixes surveyed, either during startup or by a single survey. At the conclusion of a survey, the averaged position is placed into memory and the clock is placed in Position Hold mode. If accurate position information is used, this results in a reduced standard deviation for the time data. For RS-232 command, see Section 10.2.10. There are five Auto Survey modes available: 1. Turn Off Survey – halt the survey in progress 2. Single Survey – initiate a new survey at this time 3. Power-On Survey – initiate a new survey when the clock is powered on 4. Suspend Survey – pause a survey in progress 5. Resume Survey – resume a survey that was paused ��� � � � � � � � � ���� ������� ����� ����� ������� ������� ����� � � � � �������� ������ ������ ������ ������� ������ �������� ������� ������� ������� ���� ��� ������ ���� �� � � � � � � ��� �� �� ����� � � � � � � �� ��� �� ��� ����� ����� � ��� �� � � �� �� ������� ������� ���� �� ����� ����� Figure 7.18: Survey Mode Setup 7.11.1 Number of Fixes Auto Survey configuration presents a list of possible surveys from 1 to 86,400 seconds (approx. 24 hours). Surveys are listed as 1 (single fix), 60 (1 minute or more), 300 (5 minutes or more), 900 (15 minutes or more), 1800 (30 minutes or more), 3600 (1 hour or more), 7200 (2 hours or more), 14400 (4 hours or more), 28800 (8 hours or more), 43200 (12 hours or more), and 86400 (24 hours or more). To complete a survey, the GPS receiver must be tracking at least four satellites. If, during a survey, the number of satellites being tracked drops below four, the survey will pause until the GPS receiver again begins tracking four or more satellites. Then, the survey will resume computing positions until completion.

47 7.12 Setting Position Hold ON or OFF With Position Hold turned ON, the surveyed position is placed into memory and used for computing more precise timing solutions. With Position Hold turned OFF, the GPS receiver is placed in the Fix mode, calculating a new position approximately every second as long as the GPS receiver is tracking four or more satellites. For RS-232 command, see Section 10.2.9. ��� � � � � � ��������� ����� ����� ����� � � � � � �������� ���� � � � � � � � � � � � � � � � � � �� �� ���� ���� �� ����� � � ������� ������� Figure 7.19: Position Hold Mode Setup

7.13 Setting Option Control Use the “Set Option Control” menu to configure any main board or auxiliary board option mounted in the clock. Some of these options require you to configure additional settings. For information on configuring specific options see the Option List located in Appendix C. For RS-232 command, see Section 10.2.15. ��� � ������� �������� ����� ����� ����� ������ � � � ������� � � � � � � � � � � � � ���� �� ����� ���� �� ����� � � ����� � � � ������� � � � � � � � � � � � � ���� �� �� �� �� �� �� �� ��� �� ����� �� � �������� ������� �� ��� ������� ����� �� �������� � ��� ���������� ������ ������ ������������ ���� �� ����� ����� Figure 7.20: Option Control Setup

8.1 Introduction This section covers some basic information about timing signals and how to connect them to your IEDs. Common questions concerning connecting timing signals include: • What are the different types of IRIG-B, and what are the differences? • How do you connect multiple devices to one timing output? • How far can you transmit timing signals? • What kind of cabling and connectors should I use? The steps involved in getting your devices synchronized to the GPS are fairly simple and should not take long to complete. To expedite the process, make sure to: 1. determine the type of timing signal each piece of equipment requires, and 2. enable the equipment to receive the timing signal Various methods are used to configure equipment to receive IRIG-B time codes including setting a physical jumper, or using a setup application. Some equipment can auto detect the timing signal, so that nothing else is required, other than connecting the cable. 8.2 Timing Output Description When viewing the rear panels of the Model 1092A/B/C and 1093A/B/C, you will see a number of different types of connectors as illustrated in Figure 8.1. Generally, there is a power inlet connector, a GPS antenna connector, two DB-9 serial connectors (one is an optional RS-232 port), one optional SPDT relay connector, one optional and two standard timing outputs. The Model 1093A/B/C series clocks also have an option plate that can be replaced by one of several accessory boards. Whereas the Model 1093A/B/C has an internal power supply, the Model 1092A/B/C clocks have a separate external power supply.

������ �� ��� ������� ����� ����������� ������ ������ �� �������� �������� �������� ������ ���� ������� ������ ����� ������ ��� � ��� ������� � ������� ����� ����� ������ ����� ��� ���� ��� ��� ��� ��� ��� �� ���� ���� �� ��� ������� � ������ �� ���� ������� ����� ����������� ������ �������� �������� �������� ������� ���� ������� ������ ����� ������ ��� �� ��� ���� ���� ��� ��� ������� ����� ����� �� ��� ���� �� � � ������� ������� ������ ������ ������ ������ � Figure 8.1: Rear Panel Descriptions – optional outputs may be shown 8.2.1 Inputs and Outputs – Port 1, Port 2, Port 3 Three, Phoenix-style, terminal connectors can supply timing signals to external equipment and may also be configured for input. Two of the outputs (Ports 1 & 3) are designed for digital signals and one (Port 2) for analog. Signals supplied to the digital drivers include unmodulated IRIG-B, 1 PPS (pulse per second), and programmable pulse. On main boards Option 92 is required for modulated IRIG-B. 8.2.2 Digital Drivers Each of the digital outputs is driven by a CMOS 74HCxxx quad driver capable of supplying 75 mA at 5 VDC, which may be fanned out to a number of devices. To determine the number of devices you can supply, calculate the load current required by each connected device. For example, if the IED timing signal input (e.g. IRIG-B003) requires 10 mA, one digital output should be able to support eight identical devices. 8.2.3 Analog Driver Modulated IRIG-B is available1 at Port 2 of the standard input/output block, and uses an analog driver exclusively for this purpose. Basically a push-pull audio design, the analog driver supplies 4.5 volts peak-to-peak (Vpp) to a 19.6-ohm source resistor, then to connected equipment. As the load current increases (by adding external loads), more voltage is dropped across the clock source resistor causing the drive voltage to decrease. To assure detection by your equipment, make sure to match the modulated output to within the required voltage range of the receiving equipment. Table 8.1 shows how the actual drive voltage varies with increasing load current. For IED’s with a restricted input range, it may be necessary to match the available drive voltage to the IED through a small dropping resistor or amplifier. 1For main boards choose Option 92; for new main boards it is standard.

51 Drive Current, mA Actual Drive Voltage, Vpp 0 4.5 1 4.48 10 4.3 100 2.54 Table 8.1: Drive Current vs. Voltage 8.3 Output Signal Description All clock models can provide three different digital signals and one analog signal. Digital signals consist of unmodulated IRIG-B, 1 PPS and Programmable Pulse. Analog consists of modulated IRIG-B. 1 PPS is often used to synchronize another (unsynchronized) timing signal. Programmable pulse modes are similar to 1 PPS only they have an adjustable period and pulse width with the rising edge on time. Programmable pulse modes include, seconds per pulse, pulse per hour, pulse per day, single trigger (once per year) and slow code. Pulse polarity adjustment is also available. 8.3.1 IRIG-B Description IRIG-B is a complete serial time code that occurs once per second and, depending on the config- uration, contains the day of year, hours, minutes, seconds, year and other important information. The Model 1092A/B/C and 1093A/C transmit (IRIG) Format B with four variations as seen in Table 8.2. Note that with the newer IRIG Standard 200-04, two of the designations have changed: the older B000 has become B004 and B120 has become B124. Designation, New (Old) Signal Type Code Components B004 (B000) Pulse width code, No carrier BCDT OY , BCDY EAR, CF, SBS B003 Pulse width code, No carrier BCDT OY , SBS B124 (B120) Sine wave, amplitude modulated, 1 kHz BCDT OY , BCDY EAR, CF, SBS B123 Sine wave, amplitude modulated, 1 kHz BCDT OY , SBS Table 8.2: IRIG-B Time Code Types Available The IRIG-B time code consists of 100 bits produced every second, 74 bits of which contain various time, date, time changes and time quality information of the time signal. Consisting of logic ones, zeros and reference bits, the time code provides a reliable method of transmitting time to synchronize a variety equipment. Three functional groups of bits in the IRIG-B time code are arranged in the following order: Binary Coded Decimal (BCD), Control Function (CF) and Straight Binary Seconds (SBS). The BCD group, with IEEE 1344 OFF, contains only time information including the seconds, minutes, hours and days, recycling yearly. With IEEE 1344 ON, BCD adds year information. The CF group contains other information including time quality, leap year, pending leap seconds and parity. Reference bits separate the various components of the IRIG-B time code.

8.3.2 Modulated and Unmodulated IRIG-B Figure 8.2 illustrates the primary differences between modulated and unmodulated IRIG-B. You will notice that the while modulated IRIG-B is distinctive because of the 1 kHz sinewave carrier, it is similar to unmodulated IRIG-B since the peak-to-peak values of the carrier follow the same form as the peaks of the digital waveform, which contain the information. ������� �� ��� ���� ���� ���� ��������� ��������� ���� ���� ���� ���� ���� ���� ��� ������ �� ���� ������� �� ���� ���� ��������� ����������� Figure 8.2: IRIG-B Waveforms 8.3.3 IRIG-B IEEE 1344 Extension As mentioned above, the turning IEEE 1344 ON in the clock enables extra bits of the Control Function (CF) portion of the IRIG-B time code. Within this portion of the time code, bits are designated for additional features, including: • Calendar Year (old method, now called BCDY EAR) • Leap seconds, and leap seconds pending • Daylight Saving Time (DST), and DST pending • Local time offset • Time quality • Parity • Position identifiers To be able to use these extra bits of information, protective relays, RTU’s and other equipment receiving the time code must be able to decode them. Consult your equipment manual to determine if the IEEE 1344 feature should be turned ON in the clock. To view details of the IEEE Std 1344- 1995, please check with the IEEE. NOTE: To download a copy of of the IRIG-B 2004 specification, please go to the Arbiter web site (at www.arbiter.com) and check under Documentation. 8.3.4 1 Pulse-per-Second (1 PPS) A one pulse-per-second timing signal is very simple in concept. It is a digital bit transmitted every second with a pulse width of 10 milliseconds. A critical part of this signal is that it is “on time” at

53 the rising edge when compared with the signal from the Global Positioning System (GPS). When configured from any of the TTL/CMOS (5-volt) drivers, it has the same drive power as the IRIG-B and the programmable pulse. See Figure 8.2 for a comparison between unmodulated IRIG-B and 1 PPS. 8.3.5 Programmable Pulse (PROG PULSE) Models 1092A/B/C and 1093A/B/C have an programmable pulse feature that may require some jumper and firmware configuration. Models 1093B/C and 1092B may be configured from the front panel and 1092A/C and 1093A must be configured through the RS-232 port. There are many available programmable pulse modes from which to choose that include setting the pulse width and time zone. For jumper configuration, please see Section 5.3.1, and for available modes and firmware configuration, please see Section 7.8. Programmable Pulse Mode Configured Feature Seconds per pulse X number of seconds between pulses, 0 – 60,000 Pulse per hour Number of seconds after each hour, 0 – 3599 Pulse per day Hour, minute, second, fractional seconds Single trigger Day, hour, minute, second, fractional seconds Slow code 2 seconds on the minute, 4 seconds on the hour, 6 sec- onds on the day Pulse polarity Positive or negative–going pulse Table 8.3: Programmable Pulse Modes and Features 8.3.6 Programmable Pulse with 200-Volt FET, Setup For high-level switching on the main board, choose option 1093optS001 or 1092optS001. Clocks can provide high-level switching at either of the two digital outputs (Port 1 or 3). Connect a voltage of up to 200 volts and pull down a signal with the open drain 200-Volt FET. Make sure to connect the FET with suitable protection against overvoltage transients and over current conditions. To set timing output jumpers for programmable pulse with 200-Volt FET, see Section 5.3.5. Next, you will need to configure the type of programmable pulse through the setup menus or serial port. See Sections 7.8 or 10.2.12. 8.3.7 Protecting the 200-Volt FET Connection Open-drain outputs are not internally protected against overcurrent or overvoltage. Maximum peak ratings are 100 mA and 200 V. External protections (current-limiting resistors, surge suppression diodes, snubbers, etc.) must be provided by the user, if required, to ensure that maximum ratings are not exceeded even momentarily. Also, consult the data sheet of the VN0120N3 FET used in these models.

8.4 Connecting the Outputs All clocks come equipped with Phoenix-style, screw terminal connectors, which are compatible with twisted pair cabling. To attach, strip the wires bare, DO NOT tin with solder, insert into the correct screw terminal positions and tighten clockwise. To adapt coaxial cabling to the 1092/93 terminal connectors, use a BNC Breakout2, or other similar adapter. NOTE: If using a shielded, twisted-pair cable (like Belden 8760), connect the cable shield at the clock. It has become best industry practice to ground time-code outputs from clocks, and use galvanic isolation of time code inputs to IEDs.3 8.4.1 Attaching Cables to Screw Terminals Prepare the twisted pair cable by stripping back at least 1/4” of the insulation and any shielding; DO NOT tin the bare wire with solder. Tighten the screws (clockwise) down on the wire. 8.4.2 How Far Can I Run IRIG-B Cabling? Before laying cable to transmit IRIG-B over long distances, take time to consider the following factors: (1) resistive losses in cabling, (2) electromagnetic interference, (3) propagation delays, and (4) installation and maintenance costs. Realize that when cable is laid from point A to point B that two cables are involved: one outgoing and one return. For coaxial cable, the resistance is different for the center conductor than for the outer conductor, or shield. For twisted pair wires, both outgoing and return wires will be the same. As a simple example, to connect an IRIG-B signal to a device 100 feet away from the clock, you must account for resistive losses in 200 feet of wire. For details on distributing IRIG-B signals over long distances, see application note, AN101, Distributing Timing Signals in a High-EMI Environment. Download file appnote101.pdf at the following link: http://www.arbiter.com/resources/documentation.php For important considerations about IRIG-B connections, distribution of signals and accuracy, download the following file from the same link. IRIG-B accuracy and connection requirements.pdf at the same link above. 8.4.3 Synchronizing Multiple IED’s From One Masterclock Output In many installations, master clock signals are “fanned out” to a number of devices. This method makes more efficient use of the clock synchronizing capability since the clock drivers are designed to handle multiple loads. The exact number of possible loads must be determined from the input impedance of each connected IED. 2Pomona Electrics, www.pomonaelectronics.com, (800) 444-6785, (425) 446-6010, part no. 4969 and 4970 3William Dickerson, “Time in the Power Industry: How and Why We Use It,” www.arbiter.com, Resources, Documentation

55 8.4.4 Connecting Unmodulated IRIG-B To drive multiple loads from one unmodulated IRIG-B output, make sure that the loads are wired in parallel. A common term for this is “Daisy-Chaining”, however the idea is to drive all of these loads in parallel from a single output. It is much simpler to connect loads using unmodulated IRIG-B than for modulated, because all of the loads are driven at the same voltage. To determine load current imposed on one Unmodulated IRIG-B output: 1. Determine the impedance or resistance (Rdev) of each IED load (check device manuals). 2. Calculate the load current for each device (Idev = 5V ÷ Rdev). 3. To get the total current, sum up all the load currents for all devices connected to the output in question. IdevT = Idev1 + Idev2 + . . . + IdevN, where T = Total for N devices. Unmodulated Example For example, if the input impedance of the IED is 5 kilohms, determine the device current (I) as seen in Calculation 8.1: (8.1) I = V ÷ Rdev = 5 V olts ÷ 5000 Ohms = 0.001 Amps (1 mA) If you were to connect ten of the same IED’s to the same output, then the total current drawn would be 10 x 0.001 A = 0.01 A (10 mA). Another method is to determine the lumped impedance of all of the connected IED’s in parallel. Then, determine the overall current by dividing the drive voltage (5 V) by the computed lumped impedance value. This current should not exceed 75 mA. 8.4.5 Connecting Modulated IRIG-B While the modulated driver supplies approximately 4.5 volts peak-to-peak (Vpp) open circuit, it can supply 3 Vpp into 50 ohms. This amounts to about 0.064 A (64 mA) drive current. Make sure to check the acceptable voltage range for the equipment. Some modulated IRIG-B decoders are fairly sensitive to peak-to-peak voltage levels (3.3 Vpp ± 0.5 Vpp), others are more tolerant (0.1 – 10 Vpp). With added loads, the clock’s modulated driver produces more current, which reduces the output voltage at the output terminals. Calculation 8.2 shows how to calculate the available output voltage with a 10 mA drive current. (8.2) V pp = 4.5 V pp − I × 19.6 Ohms Therefore, if you had 10 mA of load current (I load) the available voltage (Vpp) would be 4.304 Vpp. If the load current equals 100 mA, then the available voltage would be 2.54 Vpp. So, you can see how the increasing load current (i.e number of loads) affects the available drive voltage at the clock output. See also Table 8.1.

8.4.6 Wire Losses Another factor affecting the available voltage is the resistive losses through the cabling. Wire has a certain resistivity associated with it that is determined by its metallic composition, and resistance determined by the diameter and length. For example, single-strand, 22 AWG (bare, enamel-coated) copper wire has a resistance of approximately 19.6 ohms per 1000 feet. To compute the loss we must include both wires in the connection, signal and return. For coaxial cabling, the resistance of the center conductor is rated differently than the shield. For a twisted pair, both of them should essentially have the same resistance per cut length. Using 500 feet of 22 AWG shielded twisted pair wire, and including the source resistor, the available voltage would be as calculated in 8.3: (8.3) V pp available = 4.5 − I × 19.6 (Rsource) − I × 19.6 (Rwire) = 0.58 V pp So, you can see that most of the drive voltage is lost with 100 mA of current and 500 feet of 22 AWG twisted pair transmission line; this includes the voltage losses at the source resistor. 0.58 Vpp may not be detected by the decoder in some IED’s. To assure reliable detection, make your cable runs as short as possible, use a larger diameter wire and carefully distribute the loads. 8.4.7 Voltage Matching for Modulated IRIG-B With modulated IRIG-B, it was mentioned that certain decoders are very intolerant of drive voltage variation. If the IED specification says that the acceptable voltage range is 3.3 Vpp ± 0.5 volt, and the available voltage is high, then you must reduce the voltage using a dropping resistor (Rdrop). The value of the dropping resistor is determined by dividing the difference voltage (Vdiff) by the device current (Idev). For example, suppose that the available voltage is 4.3 Vpp, the (nominal) acceptable voltage is 3.3 Vpp, and the device current is 10 mA. Determine the dropping resistor value. (8.4) Rdrop = Vdiff ÷ Idev = (4.3 − 3.3) ÷ 0.01 = 100.4 Ohms The Power dissipation (P) is: (8.5) P = I2R = 0.012 × 100.4 = 0.01 Watts In this example, an eighth-watt resistor should work fine. For a voltage that is too low, then the modulated IRIG-B signal level must be increased by some other means, such as (1) distributing the load differently to reduce the current (raising the available voltage), (2) by reducing the loss through the wiring, or (3) by using an amplifier. 8.4.8 Cable Delays Electromagnetic waves travel at the speed of light (C) in free space or vacuum and a fraction of that speed through cabling. The speed of an electromagnetic wave in free space is given by Constant 8.6. (8.6) C ≈ 9.82 × 108 feet/second

57 Since electromagnetic waves travel slower through any cable, cable manufacturers normally specify cable with a velocity factor (VF), which is a percentage of the speed of light in free space, and characteristic of the specific cable. The Velocity Factor for the RG-6 cabling used by Arbiter Systems for GPS antenna connections, is about 83% of C. Most transmission lines have velocity factors in the range of 65% to 97%. Using these values you can determine the actual time delay in your cable distribution system and compare it to your required accuracy. As an example, 840 feet of RG-6 cable (with a velocity factor of 83%) would delay the timing signal by one microsecond. For IRIG-B timing applications, these delays may not be important, compared to other criteria. Otherwise, you would be forced to compensate for the time delay using another method, such as advancing the timing output or placing another master clock at the remote site. 8.4.9 Solutions There are many solutions to providing an accurate timing signal to equipment in distant locations. However, the most satisfying solution may not be to string cabling for hundreds of meters. The costs associated with installing and maintaining cabling over a wide area may be unsatisfactory. Since the GPS is so pervasive, it may prove to be less costly to install another clock at a distant location, which would also improve accuracy and provide redundancy. Before installing cabling over a wide area, be sure to first examine all the possibilities.

9.1 Relay Contacts – Option 93 9.1.1 Introduction Option 93 provides a single set of SPDT relay contacts when installed the Model 1092A/B/C or 1093A/B/C. Without Option 93 installed, the relay contact connector will be visible, however no contacts or related circuitry will be installed. To retrofit the Option 93, Out-of-Lock relay, you must arrange to return it to the factory for installation. These Form C type contacts have a limited lifetime of approximately 100,000 cycles. See also Section 2.3.5. 9.1.2 Relay Operation The out-of-lock relay is in the faulted position when the clock is powered OFF (Failsafe operation) or is not locked to the GPS. The faulted indication is as follows; ERR (Normally Closed) is shorted to COM and OK (Normally Open) is open with respect to COM. If the clock loses synchronization with the GPS, the out-of-lock relay will change state (is faulted) based on the “Out-of-Lock” setup. Configure this through the front panel (see Section 7.5) or the RS-232 interface (see Section 10.2.14). Out-of-Lock settings are (1) Unlock OFF, (2) Zero Delay Unlock, and (3) 1 to 99 Minute Delay for unlock. Figure 9.1: Relay Contact Connector 9.2 Event Inputs 9.2.1 Event Timing Input When configured for event timing, the 1092A/B/C and 1093A/B/C can provide one input channel with one microsecond resolution. This channel is primarily used for synchronization via the RS-232 port with an external computer or other type of device. It may also be used to time an external 5 V CMOS signal applied to one of the I/O connectors; see Section 5.3.4.

59 Data for individual recorded events can be recalled using either the Event/Deviation front panel key or via the RS-232C interface (see Section 10.2.4). Data for each event will be retained until it is retrieved using one of these two methods. Thus, if no event data points are retrieved, recording will be suspended when the total number of event buffer is full. As soon as data is retrieved for a recorded event, its address is made available for data corresponding to a new incoming event. 9.2.2 Event Timing Latency Event data are recorded using a high-speed capture circuit operating with a 4 MHz time-base. Latency is limited by the interrupt processing speed of the clock’s microcontroller, which in turn depends on its workload at the time the event is received. Since the workload varies from time to time, latency likewise varies. However, response time will, in general, never be less than a few hundred microseconds nor greater than 10 milliseconds. 9.2.3 Deviation Measurement The Channel A input can also be configured to display measured event times as 1 pulse-per-second (1 PPS) deviation measurements. The intended purpose of the deviation measurement function is to allow comparison of an external 1–PPS signal to the clock’s internal 1–PPS signal. The clock determines the mean time difference between the two signals, which can be displayed on the front panel or read via the RS-232 Interface. 9.2.4 Measurement Principle The measurement technique employed for 1–PPS Deviation uses the same time determination and recording scheme used for event time measurement (refer to paragraph above), but makes the assumption that the input signal is periodic and continuous. Also, the operation of the circular memory buffer is modified somewhat, in that recording does not stop after the buffer is full; new Event Data is given priority over existing data, and will overwrite it. Since the incoming signal occurs once per second and the circular buffer holds a number of events, each event time record will be overwritten on a regular basis. Once every second, the processor looks at the most recent group of 16 events. When computing deviation, it uses only the portion of the event data describing fractional seconds (e.g. values between 0.0000000 and 0.9999999 seconds). By normalizing the 16 fractional-second values around 0.0000000, the range of results from the deviation computations will be centered on zero (-0.4999999 to +0.5000000 seconds). Statistical computations are then performed on the 16 values to determine their Mean and Sigma (Standard Deviation) values, which are then displayed on the front panel or output via RS-232. 9.2.5 Event Timer Input Channel Configuration In order for the Model 1092A/B/C or 1093A/B/C to receive a timing input, adjustments to both the hardware and software configuration may be required. The hardware configuration is described in Section 5.3.4.

9.2.6 Firmware Setup Reconfiguration of the firmware may also be required to allow measurement and display of Event Time Data and/or 1 PPS Deviation. See Figure 7.17 for detail on configuring the Event/Deviation parameters from the front panel. See Section 10.2.4 for details on using the RS-232 interface. 9.2.7 Displaying Data Event and deviation data can be accessed from either the front panel or via RS-232 com- mands. The following paragraphs describe the steps required to access data using the front panel EVENT/DEVIATION key. When pressing the EVENT/DEVIATION key, the display will enter a circular scroll, which begins by showing the data (if any is present) for Channel A, as previously configured for Event Recording in Section 10.2.4. The readout will display one of the event times using the following format: CH A EVENT #nnn TIME ddd:hh:mm:ss.sssssss Where: nnn = event number (001 to 400) ddd = day of year of the event (1 to 366) hh = hour of the event (00 to 23) mm = minute of the event (00 to 59) ss.sssssss = second and fractional seconds of the event (e.g. 59.9999999) Pressing the UP and DOWN keys will scroll the display through all events presently stored in the event time buffer. If the event display mode is exited and then re-entered, the first event data displayed for a given channel will correspond to the same event number as was last displayed for that channel. However, the data itself may be changed if it has been overwritten. To clear the event buffer, press the EVENT/DEVIATION key again, while viewing event data. This will cause the display to issue the following prompt: CLEAR EVENT (A)? NOTE: If the event capture channel is not configured for event time recording, the CLEAR EVENT prompt will not be displayed. Clocks display the CLEAR EVENT prompt only if the event capture channel was previously configured for event time recording. Press ENTER during this display to delete all of the records in the event buffer, and to allow recording of new event times, starting with event number 001. If the event capture channel is configured for 1–PPS Deviation (via Event/Deviation Setup Menu), the readout will display the deviation of the 1–PPS input signal. In this case, the readout display will have the format: A 1 PPS XXXXX.XX ?S SIGMA: XXXXX.XX ?S Where: The top number is the mean (average) value of the most recent 16 records in the event buffer, and represents the mean deviation (in microseconds) of the measured 1–PPS signal from

61 the GPS 1-PPS signal. A negative number means the applied 1–PPS signal is early, i.e. before on-time, and a positive number means it is late, i.e. after on-time. The bottom number is the standard deviation (sigma) of the values of the 16 samples. 9.2.8 RS-232C Event Trapping The event capture channel of the Model 1092A/B/C and 1093A/B/C can be configured to capture one or more events via the RS-232C Serial Interface. The time mark for a captured event will correspond to the leading edge of the start bit of the first character in the RS-232C signal. This event mode can be both armed and interrogated for data over the RS-232C interface, allowing automated synchronization of an external computer or system. To perform event trapping via the RS-232C interface, the circuit must first be ARMED; that is, made ready to receive an event trigger. Only one event may be captured after every arming, but the events are stored sequentially in the event buffer in exactly the same manner as the normal event time mode. 9.2.9 Event Trapping Setup Configuring the clock to trap events on the RS-232C interface requires making the configuration changes described in Section 5.3.4. Arm the Event-Trapping circuit from the front panel using the SET RS-232 sub-menu of the SETUP menu. This menu also provides for configuration of communications port parameters (e.g. baud rate, word length, etc.) to match those of the computer or equipment to be interfaced. The following steps are required to arm the Event Trapping circuitry from the front panel: Press the following keys in order; SETUP > ENTER > SETUP > SETUP. The display should indicate the following: SET A EVENT? Press ENTER again and the display should indicate the following: ARM A EVENT? PRESS ENTER TO ARM Press the ENTER button and the Event Input should be armed. When the event occurs on the RS-232C port (i.e. the start bit of the next received character), the event data can be reviewed in the event mode, exactly as any normally captured event would be. To capture further events, the circuit must be re-armed, either by the front panel or by using the RS-232 Command “AR.” Note that received commands are viewed as complete when the final character in the command is received. Control characters, such as carriage-return and line-feed, are ignored and may follow the ‘AR’ command, but the start bit of the next character after the ‘R’ (even if a carriage return) may trigger the event timer. For a complete list of RS-232C Event Mode commands, refer to Section 10.2.4.

Set 10.1 Introduction Models 1092A/B/C and 1093A/B/C have one main RS-232 port, and one optional RS-232 port. These are labeled RS-232C and Option RS-232. When viewing the rear panel, the main port is nearest the antenna connector and the optional port is to the left of the Standard I/O connectors. RS-232 combines an RS-485 function in the same connector if Option 94 is installed. It is important to note that the Option RS-232 port does not support RS-485, neither RS-232 ports use flow control, and the RS-485 port functions in transmit only mode. Use the two serial ports interchangeably for separate functions. You may wish to interrogate the clock on one port for basic information (i.e to configure something) and at the same time be able to have the second serial port broadcasting a specific time code to a meter. While most substation IEDs appear to have standardized on the IRIG-B time code, some devices are designed to receive ASCII data through the serial port. Another common serial-port function is to connect a digital wall display to indicate the time. 10.2 Command Set This section provides information for controlling and communicating with these clocks via the RS- 232C serial interface. All off the RS-232 commands are functionally grouped into similar categories. For example, Section 10.2.3 lists all of the commands used to broadcast the date and time in one of the standard formats. Each command name and syntax is highlighted in bold at the beginning of each definition. Detailed information used to interpret the commands and responses follows each command heading. Sometimes the command is very short, such as the command to return the Local Time: TL. Other commands require a prefix or suffix with the letter command to specify them, such as to broadcast: Bn, where n = an integer specifying the broadcast. For example, the command to start the ASCII Standard broadcast string at a rate of once per second, on Local time, from the main RS-232 port is B1. When a command requests information from a clock, it returns the most current data available. Numeric data is returned as an ASCII string of numeric characters, with leading sign and embedded

63 decimal point as required. Strings are normally terminated with carriage return and line feed characters, however not always. Enter any RS-232C command as written in these tables without pressing ENTER. Characters are automatically received when typed. If including any of these commands in a programming sequence, do not include any carriage-return or line-feed characters. In each case, the actual command to do something in the clock follows the word “Command:” and is in bold font. Please read the comments below each command as some commands include one or more commas and in other cases a comma will separate multiple commands. The following symbols and syntax are used: C= Shorthand for carriage-return, line-feed U = UTC Time L = Local Time soh = An ASCII character (start of header) = Hex 01 bel = An ASCII character = Hex 07 n = integer used for various numerical values yyyy = four digit year ddd = Julian day-of-year mm = month hh = hour mm = minute ss = second www = Day of Week = Underlines are used for clarity only and graphically represent the location of ASCII spaces. 10.2.1 Custom String Command Command: @@A . . . , @@B . . . The 1093A/B/C is able to store two custom strings for broadcasting; one (i.e. Custom A) may be broadcast from the main serial port and one (i.e. Custom B) from the option serial port (Option 19 required). Use the @@A . . . command to create a Custom A string, and the @@B . . . command to create a Custom B string. Available characters and controls that may define these strings are listed in Table 10.1, followed by custom string examples. Start Custom Broadcast Command: B9, O9 B9 activates the Custom A string broadcast from the main serial port; O9 activates the Custom B string broadcast from the option serial port. Use the B0 and O0 commands to stop the broadcast (see Section 10.2.3). Return Custom String Command: UB, UO Use the UB command to return the Custom A string definition (Standard RS-232 port), and the UO command to return the Custom B string definition (Option RS-232 port, requires Option 19).

Custom Broadcast Character Set Character Meaning // / character Cssnn Xor checksum of specified range, where ss = start location (hex value from 00 to FF) and nn = number of bytes (hex value from 00 to FF) D Day of month: 01, . . . , 31 d Day of year: 001, . . . , 366 e GPS elevation: ±dddddd.dd length = 10 f Fractional Seconds: 00, . . . , 99 Hxx Hexadecimal value where xx is a hex value from 00, . . . , FF h Hour: 00, . . . , 23 Ln LCD front panel display buffer, 2 lines, 20 characters: L1 = top line; L2 = bottom line m Minute: 00, . . . , 59 M Month: 01, . . . , 12 O Local hour offset: ±hh where hh=00, . . . , 12 o Local minute offset: 0, . . . , 59 minutes Pi Latitude: where i = 1, degrees (dd); = 2, Minutes (mm); = 3, Fractional minutes (mmmm); = 4, Seconds (ss); = 5, Fractional seconds (fff); = 6, N (North) or S (South) pi Longitude: where i = 1, degrees (ddd); = 2, minutes (mm); = 3, fractional minutes; = 4, seconds (ss); = 5, fractional seconds (fff); = 6, E (East) or W (West) r Carriage return and line feed Sii String Type where ii: 01 = Status change; 02 = Vorne Opt28; 03 = Opt28 ASCII; 04 = True Time Opt28 s Seconds: 00, . . . , 59 Txx On time character where xx is a hex value from 01 to FF (Note: Must be at the start or end of the string!) U Unlock time: 00, . . . ,99 minutes vnn Option 28 values: 01 = Time Deviation; 02 = Frequency; 03 = Frequency Deviation; 04 = Amplitude; 05 = Phase Angle W Day of week: 1, . . . , 7 where 1 = Sunday w Day of week: 1, . . . , 7 where 1 = Monday y Year: 00, . . . , 99 Y Year: 2000, . . . , 2xxx z Display number Table 10.1: Characters used with Custom Strings Table 10.1 Notes. Conditionals can use any of the above, with the exception of Cssnn and Txx, in addition to any string characters. CONDITIONALS CANNOT BE NESTED!

65 True/False Condition Command: /[ii? < t > / :< f > /] where: < t > = True condition < f > = False condition ii: 01 = Locked; 02 = Status change; 03 = Locked with max accuracy; 04 = Fault; 05 = Daylight Saving Time change pending; ; 06 = Unlocked LED status (whether Unlocked LED On/Off) Ordinal Condition Command: /{ii? < 0 > / :, . . . , < n > /; < e >} where: < 0 >, < 1 >, . . . , < n > = ordinal position < e > = Else condition ii: 01 = Time Quality (13 possible ordinals); 02 = Time Quality for True Time1 format (5 possible); 03 = Time Zone Indicator (3 possible, 0=DST active, 1=Not active, 2=UTC) Binary Hex Value (worse case accuracy) 1111 F Fault-clock failure, time not reliable 1011 B 10 seconds 1010 A 1 second 1001 9 100 milliseconds (time within 0.1s) 1000 8 10 milliseconds (time within 0.01s) 0111 7 1 millisecond (time within 0.001s) 0110 6 100 microseconds (time within 10−4s) 0101 5 10 microseconds (time within 10−5s) 0100 4 1 microsecond (time within 10−6s) 0011 3 100 nanoseconds (time within 10−7s) 0010 2 10 nanoseconds (time within 10−8s) 0001 1 1 nanosecond (time within 10−9s) 0000 0 Normal operation, clock locked Table 10.2: List of Possible Time Quality Levels, Ordinal 01 Symbol ASCII Character Accuracy (space) 32 locked, maximum accuracy . 46 Error < 1 microsecond * 42 Error < 10 microseconds # 35 Error < 100 microseconds ? 63 Error > 100 microseconds Table 10.3: List of True Time Quality Levels, Ordinal 02 1For True Time Broadcast Mode, see Page 123

Using Ordinals and Conditionals An ordinal returns an ASCII character or characters (e.g. 1, 2, 3,...., good, bad, etc.) for a requested value (e.g. clock accuracy). A conditional returns an ASCII character or characters (e.g. 0, 1, locked, unlocked, etc.) based on a true/false request (e.g. Is there a Fault?). Illustrated below are several examples of using ordinals and conditionals when constructing a custom string. You can even construct standard strings to check your work. All the ordinal/conditional examples below use the ASCII Standard broadcast string. Ordinal 01. This ordinal consists of 13 different accuracy values as listed in Table 10.2. Notice the ordinals (0, 1, 2,...,B,F) are all represented in this example. All need not be used as shown in the second example. This example more closely follows the 1093A/B/C accuracy, not signaling a change until reaching 1 microsecond. @@A/T01/d:/h:/m:/s/{01?0/:1/:2/:3/:4/:5/:6/:7/:8/:9/:A/:B/:F/}/r @@A/T01/d:/h:/m:/s/{01?0/:0/:0/:0/:4/:5/:6/:7/:8/:9/;out of lock/}/r Note that the accuracy values (e.g. 0, 1, 2,...,F) can be replaced with textual values. For example, note that the value ”out of lock” in the second example replaced everything after ”9” in the first example. Ordinal 02. This ordinal consists of 5 different accuracy values as listed in Table 10.3. @@A/T01/d:/h:/m:/s/{02? /:./:∗/:#/:?/}/r Ordinal 03. This ordinal consists of three different time zone values: DST active (i.e. Daylight Saving Time), DST inactive (i.e. Standard Time) and UTC time. @@A/T01/d:/h:/m:/s/{03? DST Active/: DST Inactive/: UTC/}/r Conditional 03. In this condition the clock is queried for a locked condition. It answers true with a space if locked and false with a question mark if unlocked. @@A/T01/d:/h:/m:/s/[03? /:?/]/r 10.2.2 String Setup Examples and Tutorial In this section, you will find a number of examples of constructing a custom broadcast string that produces one of the standard broadcasts. By building up a custom string that produces a standard broadcast, you to compare the output your custom string produces with that of the standard broadcast. If the outputs agree, then your custom string must be correct. This should give you some confidence in constructing your own broadcast string. In each broadcast example that follows the first line will give the broadcast name, the second line will give the desired broadcast output and the third line shows the custom input string code. At the end of each example, you will find some string constructions notes to help you understand how to use the custom string commands in Table 10.1. This includes the use of ordinals and conditionals.

67 ASCII Standard Desired Output: ddd:hh:mm:ssC Input String Code: @@A/T01/d:/h:/m:/s/r Input String Construction Notes: Note that the ordinary method of starting the ASCII Standard broadcast is using the B1 or O1 command as described on page 69. Custom string entry always begins with the @@A for strings output from the main serial port, or @@B for strings output from the option serial port. Next, the T01 specifies the on-time character as a Hex 01, which is the Start of Header. Notice that these characters are preceded by the “/”, which precedes each of the other (Table 10.1) characters. “d” is for Julian Day, “h” if for hours, “m” is for minutes, “s” is for seconds, and “r” is for carriage return, line feed. The “:” subdivides the Julian day, hour, minute and second, and no space between characters. After typing in the Input String Code (as shown above), press the Enter key. The code’s acceptance is indicated by a carriage return line feed. Vorne Standard Desired Output: 44hhmmssC 55dddC 11nnC bel Input String Code: 44/h/m/s/r55/d/r11/U/r/T07 Input String Construction Notes: Note that the ordinary method of starting the Vorne Standard broadcast is using the B2 or O2 command as described on page 69. This input string code begins with the characters “44”; note that these are printed as that and are not preceded by a “/”. “h”, “m” and “s” follow and include a “r” for carriage-return, line-feed. “55” immediately follows the “r”, then a “d” for Julian day, followed by another “r”. “11” immediately follows the “r”, followed by a “U” for unlock time and “r” for another carriage-return, line-feed. Lastly, the “T07” specifies the on time character as the Hex 07, which sounds the bel in the machine. Note that the “44”, “55” and the “11” are not preceded by a “/” since they are printed as characters. Status Desired Output: ddd:hh:mm:ss I=nn:nn X=nn:nnC Input String Code: /[02?/d:/h:/m:/s /S01/r/:/] Input String Construction Notes: Note that the ordinary method of starting the Status broadcast is using the B4 or O4 command as described on page 70. This string begins with a true/false conditional 02, which is a change of status. Since it is a part of the Table 10.1 character set, it must be preceded by the “/”. After the “?”, appears the Julian day, hours, minutes and seconds that indicate the day and time that the status changed. After the “s” (seconds) is an intentional space as shown in the input string code. After the space is the intended “/” and “S01”, which indicates a status change string type of “01”. The “/:” separates the “or” of the “true or false” conditions, only in this case there is no specified false condition.

Extended ASCII (DTSS MSG) Desired Output: C Q yy ddd hh:mm:ss.000 Input String Code: /T0D/H0A/[03? /:?/] /y /d:/h:/m:/s.000 Input String Construction Notes: Note that the ordinary method of starting the Ext. ASCII broadcast is using the B5 or O5 command as described on page 70. “T0D” sets the on time mark as a carriage return, and “H0A” is line feed. Immediately following is a “03”, which is a “locked with maximum accuracy” conditional. This is followed by a space, which indicates that the clock is locked with maximum accuracy. If the condition is false, then it prints a “?”. The “/:” separates the true/false outputs. Outside the conditional statement are the normal values that are broadcast at the chosen rate. “y”, “d”, “h”, “m” and “s” are the two-digit year, Julian day, hours, minutes, seconds, followed by three fractional second digits and three spaces. ASCII + Quality Desired Output: ddd:hh:mm:ssQC Input String Code: /T01/d:/h:/m:/s/{01? /:./:∗/:#/;?/}/r Input String Constructions Notes: Note that the ordinary method of starting the ASCII + Quality broadcast is using the B6 or O6 command as described on page 71. This string is very similar to the Standard ASCII described earlier appended with a quality indicator, “Q”. All of the notes under ASCII Standard apply, except that “Q” is an ordinal. The ordinal will produce all of the necessary time quality values passed on by the clock. The ordinal begins with a “{” and ends with a “}”. “01” is the selected (time quality) value governing the output character. Ordinals are a sequence conditional, meaning that you have values separated by a “/:” (OR), and (in this case) at last is a “/;” (ELSE). For ASCII + Qual, there are four OR conditions (specific time quality ranges) followed by one ELSE (worst quality range). The initial ordinal is a space, meaning maximum time quality followed by a “.”, a “*”, a “#” and finally by the ELSE condition of a “?”. A carriage return line feed “r” ends the string. ASCII + Year Desired Output: yyyy:ddd:hh:mm:ssQC Input String Code: /T01/Y:/d:/h:/m:/s/{01? /:./:∗/:#/;?/}/r Input String Constructions Notes: Note that the ordinary method of starting the ASCII + Year broadcast is using the B8 or O8 command as described on page 71. The ASCII + Year is identical to the ASCII + Qual described above but includes the four-digit year followed by a space that precedes the Julian day. Notice that there are two characters for year: y (0 – 99) and Y (2000 – 2xxx). Common ASCII Characters Listed below are a few common ASCII control characters used with the Model 1092/93 series clocks. For a more complete listing of ASCII characters, you will need to consult a additional sources2. 2See Wikipedia, at http://en.wikipedia.org/wiki/ASCII

69 Other printable characters may be typed in as seen on a keyboard. Decimal Hex Abbreviation Description 0 00 NUL Null Character 1 01 SOH Start of Header 7 07 BEL Bell (sound) 10 0A LF Line Feed 13 0D CR Carriage Return Table 10.4: Short Table of ASCII Characters 10.2.3 Broadcast Mode Commands Broadcast Mode – INTERROGATE (Broadcast OFF) Command: B0, O0 B0 deactivates the RS-232C broadcast mode (resets to interrogate mode) on the main RS-232 port. O0 deactivates the RS-232C broadcast mode on the option RS-232 port. Response: C Broadcast Mode – ASCII STD Command: B1, O1 B1 configures the clock to broadcast the time-of-day as ASCII standard data from the main RS-232 port. O1 configures the clock to broadcast ASCII standard data from the option RS-232 port. Response: ddd:hh:mm:ssC Broadcast Mode – VORNE STD Command: B2, O2 B2 configures the clock to broadcast data formatted for Vorne large format time displays from the main RS-232 port. O2 configures the clock to broadcast from the option RS-232 port Vorne- formatted data. Refer to Arbiter Systems Application Note 103 for more information on using large format displays with GPS clocks from Arbiter Systems. Response: 44hhmmssC (UTC/Local Time) 55dddC (day of year) 11nnC (out-of-lock time) bel (bel = Hex 07; sounds at the end of the time code) The number and order of strings returned depend upon options ordered with clock (for example Option 28): Data is transmitted ahead of time, and the bel character is transmitted on time. When properly configured, the Vorne displays update simultaneously upon receipt of the bel character.

Broadcast Mode – EVENT DATA Command: B3, O3 B3 configures the clock to broadcast from the main RS-232 port any event data at the time it is recorded. O3 configures the clock to broadcast from the option RS-232 port any event data at the time it is recorded. Response: (Local) mm/dd/yyyy hh:mm:ss.sssssss nnnALC (UTC) mm/dd/yyyy hh:mm:ss.sssssss nnnAUC Where: nnn = Event-Buffer Read Index Number U = UTC Time, and L = Local Time Broadcast Mode − STATUS Command: B4, O4 B4 configures the clock to broadcast any status data from the main RS-232 port when it changes. O4 configures the clock to broadcast any status data from the option RS-232 port when it changes. NOTE: When a valid fault is detected, the specific status fault is broadcast (with Julian day, and time) to the chosen serial port once. When the fault clears, another message is sent describing the cleared fault. Response: ddd:hh:mm:ss I=nn:nn X=nn:nnC (Updates whenever the status changes.) Where: I, Internal clock conditions X, External clock conditions nn:nn, Status byte(Hex). The 2 digits preceding the colon describe the present condition of the instrument. The 2 digits after the colon indicate the parameters, which have changed. Bit Weight Fault Bit Weight Fault 0 1 Reserved 4 16 Out-of-Lock 1 2 Stabilized (=1) 5 32 Time Error 2 4 Reserved 6 64 VCXO tune Error 3 8 Reserved 7 128 Receiver Failure Table 10.5: Fault Indications and Definitions Broadcast Mode – EXT. ASCII Command: B5, O5 B5 configures the clock to broadcast from the main RS-232 port, the time-of-day as ASCII using an extended format prefaced with a time quality indicator (Q). O5 configures the clock to broadcast the same data from the option RS-232 port. The start bit of a carriage-return is transmitted on time. EXT. ASCII (or Extended ASCII) adds a time quality indicator at the start of the Standard ASCII time string (including some spaces).

71 Response: C Q yy ddd hh:mm:ss.000 Format: Q = Time quality indicator, and may be represented by: = meaning it is locked with maximum accuracy. ? = (ASCII 63) unlocked, accuracy not guaranteed = (space) used for clarity only and graphically represents the location of an ASCII space. Broadcast Mode – ASCII + QUAL Command: B6, O6 B6 configures the clock to broadcast from the main RS-232 port the time-of-day as ASCII data appended with a time quality indicator. O6 configures the clock to broadcast from the option RS-232 port. ASCII + QUAL means Standard ASCII plus Time Quality Indicator. Response: ddd:hh:mm:ssQC Format: soh = Hex 01 – the start bit of the soh character is transmitted on time. Q = Time quality indicator. May be represented by: (space) = locked, maximum accuracy . = (ASCII 46) Error < 1 microsecond * = (ASCII 42) Error < 10 microseconds # = (ASCII 35) Error < 100 microseconds ? = (ASCII 63) Error > 100 microseconds Broadcast Mode – YEAR + ASCII Command: B8, O8 B8 configures the clock to broadcast from the main RS-232 port, the year and time-of-day as ASCII data appended with a time quality indicator. O8 configures the clock to broadcast from the option RS-232 port. YEAR + ASCII is the same as ASCII plus Time Quality Indicator adding the four digit year to the beginning of the string. Response: yyyy:ddd:hh:mm:ssQC Format: soh = Hex 01 – the start bit of the soh character is transmitted on time. Q = Time quality indicator. may be represented by: space = locked, maximum accuracy . = (ASCII 46) Error < 1 microsecond * = (ASCII 42) Error < 10 microseconds # = (ASCII 35) Error < 100 microseconds ? = (ASCII 63) Error > 100 microseconds

Broadcast Mode – NMEA183GLL Command: 0,nB 0,nB configures the clock to broadcast the National Marine Electronics Association Standard (NMEA - 0183) to broadcast from the main RS-232 port, where n = the update rate in seconds, from 1 to 9999. GLL - Geographic Position, Latitude-Longitude Latitude and Longitude of present vessel position, time of position fix and status. Response: $–GLL,llll.llll,a,yyyyy.yyyy,a,hhmmss.sss,A*csC Where: GLL = Geographic Position, Latitude / Longitude llll.llll = Latitude of position a = N or S yyyyy.yyyy = Longitude of position a = E or W hhmmss.sss in UTC A = status: “A” is Active, “V” is Void *cs = checksum Broadcast Mode - NMEA183ZDA Command: 1,nB 1,nB configures the clock to broadcast the National Marine Electronics Association Standard (NMEA - 0183) to broadcast ZDA format from the main RS-232 port, where n = the update rate in seconds from 1 to 9999. ZDA, time and date, includes the UTC day, month, year, and local time zone. Response: $–ZDA,hhmmss.ss,dd,mm,yyyy,±xx,xx,*csC Where: ZDA = Time and date hhmmss.ss = Time in UTC dd = Day, 01 to 31 mm = Month, 01 to 12 yyyy = Year ±xx,xx = Local zone description, 00 to +/- 13 hours and minutes *cs = checksum Broadcast Data – ABB SPA MSG Command: 0,nTB 0,nTB configures the clock to broadcast the ABB SPA format from the main RS-232 port, where n = the time zone; time reported is in UTC format for n = 0, and Local format for n = 1. The ABB SPA time string is a sequence of 32 ASCII characters starting with the characters >900WD and ending with the carriage return character. The letters printed in italics are replaced by ASCII numbers whereas the other characters are part of the time string.

73 Response: >900WD:yy-mm-dd hh:mm:ss.fff:cc< CR > yy-mm-dd the current date: yy = year of century, (00. . . 99) mm = month, (1. . . 12) dd = day of month, (01. . . 31) = Space (ASCII 20h) hh:mm:ss.fff the current time: hh = hours, (00. . . 23) mm = minutes, (00. . . 59) ss = seconds, (00. . . 59, or 60 while leap second) fff = milliseconds, (000. . . 999) cc = Check sum* < CR > = Carriage Return (ASCII code 0Dh) *EXCLUSIVE-OR result of previous characters, displayed as HEX byte (2 ASCII characters 0. . . 9 or A. . . F) Broadcast PATEK PHILIPPE MSG (CUSTOM 1) Command: BA, OA BA configures the clock to broadcast the Patek Philippe message (or CUSTOM 1) from the main RS-232 port. OA configures the clock to broadcast the Patek Philippe message from the Option RS-232 port. Response: T:yy:mm:dd:dw:hh:mm:ssC Where: dw = day of week Broadcast KISSIMMEE MSG Command: 1,nTB 1,nTB configures the clock to broadcast the Kissimmee message (Telegyr 5700) from the main RS-232 port, where n = the time zone; time reported is in UTC format for n = 0, and Local for n = 1. Response: ddd:hh:mm:ssQC Where: Q = quality indicator (with indicators shown below) = locked, maximum accuracy . = (ASCII 46) Error < 1 microsecond * = (ASCII 42) Error < 10 microseconds # = (ASCII 35) Error < 100 microseconds ? = (ASCII 63) Error > 100 microseconds Pin 6 Serial Port Broadcast Control Command: xPM

xPM activates (x = 1) or deactivates (x = 0) the use of the main serial port, pin 6 controlling (by high or low input) the output from pin 3. When used with a modem, the modem can be programmed to toggle HI and LO to effectively free it from domination from a broadcast output from the clock and restore operation. Normally, pin 6 is not used to control any communications in the clock. The default setup when shipped from the factory turns OFF this feature. To enable this feature, and halt the transmit output from the UART to the serial port connector (pin 3), send a 1PM. When the broadcast control is enabled and pin 6 is pulled LO, the transmitted output will stop. When broadcast control is enabled and pin 6 is pulled HI, the transmitted output will continue from the serial port. Response: C 10.2.4 Event Mode Commands Return Specific Event Command: nnnA nnnA sets the event buffer read index to a specific event number (001 to 400), and returns that event information in either Local or UTC time format depending on how the command, nTA is configured. Response: LCL mm/dd/yyyy hh:mm:ss.sssssss nnnLC UTC mm/dd/yyyy hh:mm:ss.sssssss nnnUC Format: nnn = Event–Buffer Read Index Number U = UTC Time L = Local Time Set Event Channel Time Command: nTA nTA sets the time source as either Local or UTC, where n = 0 sets the event time to UTC and n = 1 sets the event time to Local. Response: C Set Channel – Deviation Command: AD AD sets channel A to the 1-PPS deviation mode. Response: C Set Channel – Event Command: AE AE sets Channel A to the event recording mode. Response: C

75 Clear Event Buffer Command: CA CA clears the channel A event buffer and then resets the read and wrote indices to 0. Response: C Return Deviation for Event Channel Command: DA DA returns 1-PPS deviation and sigma for the event input. Response: ± dddd.dd ssss.ssC (Results are in microseconds) Format: dddd.dd = the deviation from 1-PPS (GPS), averaged over 16 samples ssss.ss = the standard deviation (sigma) of samples Arm Event Trigger Command: AR AR arms the RS-232C event capture circuitry. Response: C Return Single Event Command: EA EA returns a single event record from the channel A event buffer. The record number (nnn) increments once for every issuance of this command. Response: Local Time mm/dd/yyyy hh:mm:ss.sssssss nnALC UTC time mm/dd/yyyy hh:mm:ss.sssssss nnnAUC Format: A = Channel A U = UTC time, Channel A L = Local time, Channel A NO DATAC (if buffer is empty) 10.2.5 Status Mode Commands Return Status of Event/Deviation Command: SA SA returns the event/deviation channel setup information, read index number and write index number. Response: D(E), R = nnn, S = mmmC Format: D indicates the input channel is in 1–PPS deviation mode E indicates the input channel is in event mode

nnn Channel read index (001 to 400) mmm Channel write index (001 to 400) NOTE: When nnn = mmm, using the EA command to read event data, the event buffer is empty, i.e., all event data which has been recorded has also been read. Return Clock Status Command: SC SC returns the current clock status. Response: L/U, U=xx, S=nnC Format: L = Clock currently locked to GPS (U for unlocked). xx = Indicates loss of lock period, up to 99 minutes. nn = User specified out-of-lock delay, 00 to 99 minutes (refer to Table A-8). S = Off if the out-of-lock function is deactivated, S = ZDL indicates zero delay. Return DCXO Status Command: SD SD returns the DCXO (Digitally Compensated Crystal Oscillator) status, which compares the oscillator with the 1 PPS to track the oscillator drift. Response: ±pp.pp PPMC Format: pp.pp = Residual, corrected DCXO error, in parts per million EEPROM Status Command: SE SE returns the EEPROM status. Response: T=t CE=ee Format: t = 0, No Timeout Error; t = 1, Timeout Error ee = Number of corrected errors in reading EEPROM data Receiver Status Command: SR SR returns the current receiver status. Response: V=vv S=ss T=t P=Off E=0C Format: vv = number of satellites, visible to the antenna, per almanac. ss = relative signal strength (range: 0 to 255, nominal value = 15)

77 t = number of satellites being actively tracked (up to twelve) P = Off, indicates that the time dilution of precision (TDOP) calculation is not being performed. Returns 1.0 - 99.0, depending on satellite geometry, when TDOP calculation is being performed. A TDOP calculation is NOT performed if less than 3 satellites are visible, OR if Position-Hold is active. E = 0, currently unused. Survey Status Command: SQ SQ returns Auto-Survey mode data. For a survey in progress, it returns current status of the survey. For a completed survey, it returns the final results of the survey, i.e. the averaged position. Response: Sn Pm Fnnnnn #nnnnn Tyyyy:dd:hh:mm:ss Eddd:mm:ss.sss Ndd:mm:ss.sss Hmmmmm.mm C Format: Sn = status of the Auto-Survey mode Pm = status of the Position-Hold mode Fnnnnn = current number of fixes #nnnnn = total number of fixes required yyyy:ddd:hh:mm:ss = completion time of the most recent average Eddd:mm:ss.sss = surveyed longitude Ndd:mm:ss.sss = surveyed latitude Hmmmmm.mm = surveyed elevation Table 10.6 columns on the left show the significant three bits of the Auto Survey status byte, weighting and assignments. On the right, columns show the significant three bits of the Position Hold status byte, weighting and assignments. Bit Weight Function Bit Weight Function 0 (LSB) 1 Single Auto Survey 0 (LSB) 1 Position Hold Enabled 1 2 Power-On Survey 1 2 Position Hold Active 2 4 Suspend Survey 2 4 Position Hold ID:* 3–7 N/A – 3–7 N/A – Table 10.6: Survey (Sn) / Position-Hold Status (Pm) *0=surveyed, 1=User-entered The remainder of the information is the running position average, including all fixes since the beginning of the Auto Survey cycle. Gives latitude and longitude in degrees, minutes and seconds. Indicates E, W, N, and S respectively as East or West longitude and North or South latitude, and H indicating elevation in meters WGS–84 (World Geodetic Survey, 1984). System Status Command: SS SS returns the instrument operation status whenever the status changes. See Table 10.5 for bit assignments of clock conditions.

Response: I=nn:nn X=nn:nnC Format: I = internal clock conditions X = external clock conditions nn:nn = hexadecimal representations of the status byte. The two digits preceding the colon describe present condition of the instrument. The two digits after the colon indicate the parameters that have changed. Time Quality Command: TQ TQ returns a single ASCII character (0, 4–9, A, B, F) indicating estimated worst-case time quality, which follows the IEEE Standard, P1344. Table 10.7 gives the returned value and error category. Response: hC Value, h Time Error Value, h Time Error 0 Locked, max. Accuracy 8 Unlocked, accuracy < 10 ms 4 Unlocked, < 1 us 9 Unlocked, < 100 ms 5 Unlocked, < 10 us A Unlocked, < 1 s 6 Unlocked, < 100 us B Unlocked, < 10 s 7 Unlocked, < 1 ms F Clock failure Table 10.7: Unlocked Time Quality 10.2.6 Local / Daylight Saving Time Setup Commands Return Daylight Saving/Summer Time Settings Command: 0DT 0DT returns the current Daylight Saving / Summer Time settings to the connected RS-232 port (Modes: OFF, ON, or AUTO). Response: Mode :AUTO C START:02:00 Second SUN of MARC STOP :02:00 First SUN of NOVC Set Daylight Saving/Summer Time Mode Command: 1,mDT 1,mDT activates the Daylight Saving mode, where m = 0, 1, 2, with 0 = OFF, 1 = ON, and 2 = AUTO. When OFF this time adjust feature does not add the specified offset to local time display and output. With m = 1 (ON), the Daylight Saving / Summertime feature is always on. With m = 2, the Daylight Saving / Summertime feature will automatically change at the specified dates

79 and times. To complete the Daylight Saving / Summer Time setup, you must also use the “Set Daylight Saving Auto Start” and “Stop” commands that follow below. Response: C Set Daylight Saving/Summer Auto Start Time Command: 2,w,x,y,zDT 2,w,x,y,zDT sets the starting (Start) date and time for Daylight Saving / Summer Time AUTO setting. Where: w = Month (0 through 11), with 0 = Jan, 1 = Feb, ... 11 = Dec. x = WeekOfMonth (0 through 5), with 0 = First, 1 = Second, 2 = Third, 3 = Last, 4 = Second from Last, and 5 = Third from Last. y = DayOfWeek (0 through 6), with 0 = Sun, 1 = Mon, . . . , 6 = Sat. z = Minutes after midnight z (0 through 1440). Response: C Set Daylight Saving/Summer Auto Stop Time Command: 3,w,x,y,zDT 3,w,x,y,zDT sets the ending (Stop) date and time for Daylight Saving / Summer Time AUTO setting. Where: w = Month (0 through 11), with 0 = Jan, 1 = Feb, . . . , 11 = Dec. x = WeekOfMonth (0 through 5), with 0 = First, 1 = Second, 2 = Third, 3 = Last, 4 = Second from Last, and 5 = Third from Last. y = DayOfWeek (0 through 6), with 0 = Sun, 1 = Mon, . . . , 6 = Sat. z = Minutes after midnight z (0 through 1440). Response: C Local Offset Command Command: ±hh:[mm]L ±hh:[mm]L sets the local offset in hours and fifteen-minute increments from -12:00 to +12:00, where hh and mm equals the number of hours and minutes, positive (East) or negative (West). Response: C 10.2.7 Front Panel Control Commands Disable Control Panel Command: FB FB disables all control–panel keys and blanks the front panel display – Models 1092B and 1093B/C only. Response: C

Enable Control Panel Command: FE FE enables all control–panel keys and activates the front panel display – Models 1092B and 1093B/C only. Response: C Lock Setup Keys Command: FL FL disables setup control keys and activates the front panel display – Models 1092B and 1093B/C only. Response: C Set Backlight – OFF Command: L0 L0 disables the backlight operation – Models 1092B and 1093B/C only, with Option 01 installed. Response: C Set Backlight – ON Command: L1 L1 selects the continuous backlight operation – Models 1092B and 1093B/C only, with Option 01 installed. Response: C Set Backlight – AUTO Command: L2 L2 enables the automatic backlight operation – Models 1092B and 1093B/C only, with Option 01 installed. It keeps the backlight active for 30 seconds after any key is pressed. Response: C 10.2.8 IRIG-B Data Output Commands IRIG Data IEEE 1344 Command: In In activates (n=1) or deactivates (n=0) the IEEE 1344 extension, which uses IRIG-B control bits for additional information. Information includes the two-digit year, local offset, time quality and notification of pending non-sequence events such as leap seconds and daylight saving time changeovers. Response: C

81 IRIG Data – Local Command: IL IL configures all IRIG time data outputs to local time code reference. Response: C IRIG Data – UTC Command: IU IU configures all IRIG time data outputs to UTC time code reference. Response: C 10.2.9 Position Data Commands Return Elevation Command: LH LH returns the current antenna elevation. In Position Hold mode, LH returns the current position- hold elevation setting. In Fix mode, LH returns the most recent computed elevation value (calcu- lated each second). Elevation is referenced to the WGS-84 datum. Response: nnnnn.nnC (from -1000.00 to +18000.00 meters WGS-84) Format: n = -1000.00 to +18000.00 meters. Return Latitude Command: LA LA returns the current antenna latitude. In Position Hold mode, LA returns the current position- hold latitude setting. In Fix mode, LA returns the most recent computed latitude value (calculated each second). Response: Ndd:mm:ss.sssC Format: N = North (S for South), dd = degrees, mm = minutes, ss.sss = seconds Return Longitude Command: LO LO returns the current antenna longitude. In Position Hold mode, LO returns the current position- hold longitude setting. In Fix mode, LO returns the most recent computed longitude value (calcu- lated each second). Response: Wddd:mm:ss.sssC Format: W = West (E for East), ddd = degrees, mm = minutes, ss.sss = seconds

Position–Hold – OFF Command: PH0 PH0 deactivates the Position–Hold timing mode. The receiver resumes computing time and position solutions approximately each second. This is referred to as the Fix mode. Response: C Position–Hold – ON Command: PH1 PH1 activates the Position–Hold timing mode. In this mode, the receiver position is held fixed and each channel is used to compute a timing solution. These solutions are averaged together, resulting in reduced timing noise due to to Selective Availability and RF channel noise. To operate properly, the position used by the receiver must be fairly accurate. Due to the risk that previously stored position data may be inaccurate, exercise caution when activating the Position–Hold mode without either performing an Auto Survey or getting the position directly. Failure to observe these precautions may result in serious timing errors. Set Position Hold – Elevation Command: MMMMM.mmH Sets the antenna elevation in meters MSL (mean sea level); fractional meters of elevation are optional. Position Hold must be enabled to set position. Format: M = meters; m = fractional meters Response: C Set Position Hold – Latitude Command: dd:mm:ss.sssN(S) Sets the antenna latitude in degrees, minutes and seconds, North (N) or South (S). Position Hold must be enabled to set position. Format: dd = degrees; mm = minutes; ss.sss = seconds and fractional seconds Response: C Set Position Hold – Longitude Command: ddd:mm:ss.sssE(W) Sets the antenna longitude in degrees, minutes and seconds, East (E) or West (W). Position Hold must be enabled to set position. Format: ddd = degrees; mm = minutes; ss.sss = seconds and fractional seconds Response: C