AVE Opto 232 Operation Manual

Specifications

Brand:	AVE
Category:	Adapter
Model:	Opto 232 (Operation Manual)
File Type:	PDF
File Size:	0.13 Mb
Pages:	12

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Opto 232 Adapter

RS-232 Bi-Directional Optically Isolated Adapter • Introduction The Opto232 is designed specially for the VSI-Pro but will work with any RS-232C device. It basically separates the ground signal from the transmitting device to the receiving device by optical LED devices. The specific application is to optically isolate the RS-232 sig- nals and ground from cash registers to the VSI-Pro and the CCTV system. Many CCTV systems use many different power sources to power the cameras which are normally very far from the recording system. This can create power ground loops which make the ground signal of the CCTV system be at a higher voltage other than zero or ground. When this high voltage ground is connected to the cash register ground all kinds of problems can arise and can damage either the CCTV system or the cash register or both. Therefore isolating the ground signal via the Opto232 prevents this problem. • Function The Opto232 requires a power source for the VSI-Pro side and another power source from the cash registers side. Since the VSI-Pro can power external devices via the DTR (Pin4) and DSR (Pin6) of its DB9F connector an external power source for the VSI-Pro side is not required and no external power supply connector is supplied. Therefore if you use an- other device other than the VSI-Pro you must make sure one of these pins can supply a minimum of 10 VDC or you must wire a user supplied external supply to one of these pins. Page 2

The cash register side has an external power supply connec-

tor to use a standard 2.1 x 5.5 mm DC Coax power connector and unregulated 12VDC should be used. However the Op- to232 has jumpers to select using DTR (Pin4) and DSR (Pin6) to power to the Opto232 if the cash register has this ability. However, if the cash register is just using its TXD signal to send data to the VSI-Pro no power supply or power connec- tion is required. This power source is only required if data from the VSI-Pro is to be sent to the cash register and the cash register receives the data on its RXD. • Shielding The metal shield of a DB9 connector is normally connected to the shield of the cable to eliminate RFI and EMI interference in the RS-232 signal. In the Opto232 the metal shield of each DB9 connector is not connected to anything so a true isolation between input and output. Therefore the shield of any cable to the Opto232 must be connected to the shield of the sending or receiving device since no connection is made to or through the Opto232. • VSI-Pro Connection In most cases the Opto232 can plug in line with all the stan- dard cash register cables from AVE. It also can plug directly to the DB9F connector on the rear of the VSI-Pro. A standard CR-802 cable which is a DB9M to DB9F 9 conductor exten- sion cable can also work between the VSI-Pro and the Op- to232 or between the Opto232 and the register. Page 3

Since the DVR ground is normally part of the CCTV ground it

should be connected directly to the ground of the VSI-Pro. If you are using the TXD output of the VSI-Pro to the DVR, Reg- com, Networker or Vnetworker then you should use an AVE “Multifunction Cable Adapter” directly on the rear of the VSI- Pro and then use the Opto232 after that connection to the cash register. The Multifunction cable will wire the TXD signal with the VSI-Pro ground directly to the DVR before the Op- to232 and isolate the ground from the DVR from the cash reg- ister. If you wish to isolate the ground of the VSI-Pro from the DVR then you should use another Opto232 or that purpose. It is not recommended to connect the DVR ground to the cash register ground but in many cases for properly installed CCTV systems this will be okay. • Other Connections Jumpers are provided in the Opto232 to defeat standard RS- 232C Hardware handshaking functions without special cable wiring. It allows you to short RTS and CTS together and/or DTR and DSR together via convenient jumpers.

Connector Pin Out and Assignments

DB9M to VSI-Pro Side 1 – N/C 2 – TXD 3 – RXD 4 – DTR Connected to power the Opto232 5 – GND 6 – DSR Connected to power the Opto232 7 – RTS N/C 8 – CTS JP1 ON = Connected to power of the Opto232 OFF = N/C 9 – N/C DB9F from Cash Register Side 1 – N/C 2 – RXD 3 – TXD 4 – DTR JP1 1-2 ON = Connected to power the Opto232 1-2 OFF = Not Connected to power the Opto232 JP2 3-4 ON = Short DTR (4) to DSR (6) 5 – GND 6 – DSR JP1 3-4 ON = Connected to power the Opto232 3-4 OFF = Not Connected to power the Opto232 7 – RTS JP2 1-2 ON = Short RTS (7) to CTS (8) 8 – CTS JP2 1-2 OFF = No Short 9 – N/C

Networker / Regcom

CR-802 or Plug Direct Multi - Function Cable M Cash Register F Use Standard Emulate / Tap Cable M F VSI-Pro CR-802 or Plug Direct USB RS232 Adapter VSI-Pro Opto 232 Opto 232 VSI-Pro Opto 232 with DVR, Networking, Regcom VSI-Pro Opto 232 & USB232

VSI-Pro to PC Opto 232 Powered by PC

VSI-Pro to PC External Power PC PIN 7 - 8 PIN 4 - 6 & Powered PIN 7 - 8 PIN 4 - 6 & Powered VSI-Pro VSI-Pro M F Opto 232 Gender Changer Gender Changer CR-802 or Plug Direct CR-802 or Plug Direct M F Power Supply Opto 232