US Robotics 3CP3453 Quick Reference Card

Commands This card provides a quick reference for the most commonly used AT commands. Defaults in bold type. NOTE: Refer to the Alphabetic Command Summary, in the User Guide on the CD-ROM for additional commands, like the Percent (%) and Octothorpe (#) command sets. BASIC COMMAND SET Command/Description $ Displays Help for the basic command set +++ Escape code > Repeat command (up to 10 attempts) A modem answers when there’s no incoming call A/ Reexecutes the last-issued command A> Repeats the last issued command until canceled AT Attention prefix Bn Sets handshaking options: B0 ITU-T V.32 originate mode B1 HST originate mode; Bell answer tone Cn Sets transmitter B0 Transmitter off B1 Transmitter on Dn Dials phone numbers and issues commands for dialing options: P Pulse dial T Tone dial , (Comma) Pause for 2 seconds ; (Semicolon) Return to command mode after dialing “ Dial the letters that follow W Wait for a second dial tone (if X3 or higher) @ Wait for an answer (with X3, X4 or X7) / Pause for 125 milliseconds R Reverse frequencies ! Flash the switchhook L? Display the last-dialed number L Redial the last number Sn Dial number stored in non-volatile random access memory (NVRAM) at position n $ Display Help for the dial commands En Command mode echo EO Echo OFF; What you type will not display E1 Echo On; What you type will display Fn Online local echo F0 Echo ON F1 Echo OFF Hn On/Off hook control H0 Go on hook (hang up) H1 Go off hook (pick up) In Queries the modem I3 Banner I4 Current settings I5 NVRAM settings I6 Statistics for preceding call I7 Product configuration I10 Dial security account status I11 Extended Link Screen I15 Caller ID information Kn Controls the modem clock K0 If online, current call duration K1 Displays real time Ln Controls speaker volume L0 Low volume L1 Low volume L2 Medium volume L3 High volume Mn Controls when the speaker sounds M0 Always OFF M1 ON until call is negotiated M2 Always ON M3 ON after last digit is dialed On Return online; use with escape code (+++) O0 Return online O1 Return online and retrain P Pulse dial Qn Enables or disables the display of result codes Q0 Display Q1 Suppress (quiet) Q2 Suppress when answering Sr=n Sets S-register value; r is any S-Register; n must be a decimal between 0 and 255 Sr.b=n Sets bit-mapped register; r is the S-register, b is the bit, and n is 0 (OFF) or 1 (ON) Sr? Queries contents of S-register r S$ Displays s-register help T Tone dial Vn Displays result codes verbally or numerically V0 Numeric V1 Verbal Xn Call progress reporting X3 Ignore dial tone X4 Microsoft® default X7 Courier V.Everything Modem default Z Software reset Z! Hardware reset AMPERSAND (&) COMMAND SET Command/Description &$ Displays Help for the ampersand (&) command set &An Enables or disables the additional result code subsets &A0 Disables the display of additional result codes &A1 Displays ARQ result codes &A2 Displays ARQ result codes, modulation indicators &A3 Displays ARQ result codes, modulation indicators, and error control indicator &Bn Sets the serial port rate &B0 Variable &B1 Fixed &B2 Fixed serial port rate in ARQ mode; variable rate in non-ARQ mode &Cn Controls Carrier Detect (CD) &C0 CD always on &C1 Normal CD operations &Dn Controls Data Terminal Ready (DTR) &D0 Ignore DTR &D1 Online command mode with DTR toggle &D2 Normal DTR operations &D3 Modem resets with DTR toggle &Fn Loads configuration template &F0 Loads No flow control template &F1 Loads Hardware flow control template &F2 Loads Software flow control template &Gn Sets guard tone &G0 No guard tone (U.S., Canada) &G1 Guard tone (Some European countries) &G2 Guard tone (UK); requires ATB0 &Hn Transmit Data flow control &H0 Disables Transmit Data flow control &H1 Hardware Clear to Send (CTS) flow control &H2 Software flow control (XON/XOFF) &H3 Hardware and software flow control &In Received Data software flow control &I0 Disables XON/XOFF flow control &I1 Modem acts on XON/XOFF commands and passes them to the remote device &I2 Modem acts on XON/XOFF commands and removes commands from the data stream (recommended for ARQ mode) &I3 External: Hewlett Packard-Host mode (ARQMode Only) &I4 External:Hewlett Packard-Terminal mode (ARQMode Only) &I5 XON/XOFF in non ARQ Mode &Kn Enables or disables data compression &K0 Disable &K1 Auto enable/disable &K2 Enable &K3 Selective compression (V.42 bis only) &Mn Error control &M0 Normal mode; no error control &M4 Normal /ARQ mode &M5 Asynchronous ARQ mode &Nn Sets fixed link speed &Nn&Un Sets highest and lowest link speeds n = 0 Variable connection rate n = 1 300 bps n = 21 33.3 Kbps n = 2 1200 bps n = 22 34.6 Kbps n = 3 2400 bps n = 23 36.0 Kbps n = 4 4800 bps n = 24 37.3 Kbps n = 5 7200 bps n = 25 38.6 Kbps n = 6 9600 bps n = 26 40.0 Kbps n = 7 12.0 Kbps n = 27 41.3 Kbps n = 8 14.4 Kbps n = 28 42.6 Kbps n = 9 16.8 Kbps n = 29 44.0 Kbps n = 10 19.2 Kbps n = 30 45.3 Kbps n = 11 21.6 Kbps n = 31 46.6 Kbps n = 12 24.0 Kbps n = 32 48.0 Kbps n = 13 26.4 Kbps n = 33 49.3 Kbps n = 14 28.8 Kbps n = 34 50.6 Kbps n = 15 31.2 Kbps n = 35 52.0 Kbps n = 16 33.6 Kbps n = 36 53.3 Kbps n = 17 28.0 Kbps n = 37 54.6 Kbps n = 18 29.3 Kbps n = 38 56.0 Kbps n = 19 30.6 Kbps n = 20 32.0 Kbps &Rn Received Data (RTS) hardware flow control &R0 Delay clear to send (CTS) response after RTS &R1 Ignore RTS &R2 Send data to the computer on receipt of RTS &Sn Data Set Ready (DSR) signal from modem to pc &S0 DSR always on &S1 Originate mode: Send DSR after dialing Answer mode: Send DSR after tone &S2 Pulsed DSR with CTS following CD &S3 Same as &S2, but without CTS &S4 Simultaneous DSR with CD &S5 Send DSR, and follow CTS with CD &W Writes the current settings to NVRAM &Zn=s Stores up to 10 phone numbers in NVRAM at position n where n = 0-9 &Zn? Displays the stored phone number

S1 0 Counts and stores number of rings from calls S2 43 Stores code for the escape code character S3 13 Stores the code for the carriage return S4 10 Stores the code for the line feed character S5 8 Stores the code for the back space character S6 2 Stores the wait time for dial tone S7 60 Stores the wait time for carrier S8 2 Sets the comma time in seconds S9 6 Sets duration (1/10 of sec.) of remote carrier signal before modem recognition S10 14 Sets duration (1/10 of sec.) modem waits after loss of carrier before hanging up S11 70 Set touch tones spacing in 1/10 seconds. S12 50 Sets the guard time for the escape code S13 0 Bit-mapped register Bit Value Result 0 1 Reset when DTR drops 1 2 Originate mode in Auto Answer 2 4 Disables pause before result codes 3 8 Auto Dial the number stored in NVRAM position 0 on DTR 4 16 At power on, Auto Dial number stored in NVRAM at position 0 5 32 Disable HST 6 64 Disable MNP Level 3 7 128 Hardware Reset S14 1 Bit-mapped register Bit Value Result 0 1 Disconnects on Escape code S15 0 Bit-mapped register Bit Value Result 0 1 Disables high frequency equalisation 1 2 Disables online fallback 2 4 Disables 450 bps back channel 3 8 Sets non-ARQ buffer to 128 bytes 4 16 Disables MNP Level 4 5 32 Set backspace key to delete 6 64 Unusual MNP incompatibility 7 128 Custom applications only S19 0 Sets the inactivity timeout, in minutes S21 10 Length of break in ARQ mode, 1/100 seconds S22 17 Stores the ASCII code for the XON character S23 19 Stores the ASCII code for the XOFF character S24 150 Sets DSR pulse time in 20-milliseconds S25 5 Sets DTR recognition in 10-milliseconds S26 1 Sets the RTS/CTS delay, 10-milliseconds S27 0 Bit-mapped register Bit Value Result 0 1 Enables V.21 modulation at 300 bps 1 2 Disables Trellis Code modulation 2 4 Disables V.32 modulation 3 8 Disables 2100 Hz answer tone 4 16 See Bit 4 and Bit 5 below 5 32 See Bit 4 and Bit 5 below 7 128 Unusual software compatibility Bit4 Bit5 Result 0 0 Complete handshaking sequence 16 0 Disables MNP 0 32 Disables V.42 detection and LAPM 16 32 Disables detection phase S28 8 Sets duration, in tenths of a second, of extra 3000/600 Hz answer tones S29 20 Sets, in tenths of a sec, of the V.21answer tone S34 0 Bit-mapped register Bit Value Result 0 1 Disables V.32 bis 1 2 Disables enhanced V.32 Mode 2 4 Disables Quick V.32 Retrain 3 8 Enables V.23 modulations 4 16 Externals: Forces MR LED to show DSR 6 64 Disables remote access busy message 7 128 Disables V.32 terbo S38 0 Sets duration, in seconds, before a forced hang up S41 0 Sets number of attempts for remote access S42 126 Stores the ASCII code for remote access escape S43 200 Sets the guard time for the remote access sequence, in 1/50th of a second S44 15 Leased line delay timer S51 0 Bit-mapped register Bit Value Result 0 1 Disables MNP/V.42 in V.22 1 2 Disables MNP/V.42 in V.22bis 2 4 Disables MNP/V.42 in V.32 6 64 Disables selective reject S53 0 Bit-mapped register Bit Value Result 0 1 Enables dial security 1 2 Enables prompting 2 4 Enables local password protection S54 64 Symbol bit-mapped register Bit Value Result 0 1 Disable 2400 symbol rate 1 2 Disable 2743 symbol rate 2 4 Disable 2800 symbol rate 3 8 Disable 3000 symbol rate 4 16 Disable 3200 symbol rate 5 32 Disable 3429 symbol rate 6 64 Disable Call Indicate (CI) 7 128 Disable V.8 S55 0 Trellis code bit-mapped register Bit Value Result 0 1 Disable 8S-2D trellis code 1 2 Disable 16S-4D trellis code 2 4 Disable 32S-2D trellis code 3 8 Disable 64S-4D trellis code 7 128 Enable phase roll detection S56 0 Bit-mapped register Bit Value Result 0 1 Disable non-linear coding 1 2 Disable TX level deviation 2 4 Disable preemphasis 3 8 Disable precoding 4 16 Disable shaping 5 32 Disable V.34+ 6 64 Disable V.34 7 128 Disable V.FC S58 0 Bit-mapped register Bit Value Result 0 1 Disables x2 5 32 Disables V.90 S69 0 Bit-mapped register Bit Value Result 0 1 Disables plug/play signalling 1 2 Enables carrier loss redial S70 0 Bit-mapped register Bit Value Result 0 1 Enables recognition of Ring A 1 2 Enables recognition of Ring B 2 4 Enables recognition of Ring C 3 8 Enables recognition of Ring D U.S. Robotics 56K Corporate Modem Quick Reference Card PN R24.0330.00 Copyright© 2002 U.S. Robotics Corporation. All rights reserved. U.S. Robotics and the U Robotics logo are registered trademarks of U.S. Robotics Corporation. Other product nam are for identification purposes only and may be trademarks of their respective companie Product specifications subject to change without notice. Printed in xxxxxxxxxxxxxxxxxxxxx Quick Reference Card