IBM CORPORATION AT 288MW Card Type Fax, Modem (asynchronous) Chip Set Unidentified I/O Options Digital Simultaneous Voice Data Maximum Data Rate 28.8Kbps Maximum Fax Rate Unidentified Data Bus 8-bit ISA Fax Class Class I & II Data Modulation Protocol Bell 103/212A ITU-T V.21, V.22, V.22bis, V.32, V.32bis, V.34 Fax Modulation Protocol Unidentified Error Correction/Compression MNP5, V.42, V.42bis V1987 Proprietary AT Command Set AUTO-RELIABLE FALLBACK CHARACTER Type: Configuration Format: AT [cmds] %An [cmds] Default: 0 Range: 0-127 Unit: ASCII Description: Sets the character used as the auto-reliable fallback character; %A0 will disable this function. AUTO-RETRAIN - AUTO-FALLBACK/FALL-FORWARD Type: Configuration Format: AT [cmds] %En [cmds] Description: Controls auto-retrain mode and fallback/fall-forward Command Function %E0 Auto-retrain disabled %E1 Auto-retrain enabled %E2 Auto-retrain and auto-fallback/fall-forward enabled BREAK SEND Type: Configuration Format: AT [cmds] \B [cmds] Description: Sends break to modem BREAK TYPE Type: Configuration Format: AT [cmds] \Kn [cmds] Description: Configures action of break signal Command Break from DTE Break received from remote modem \K0 Online command mode Break sent immediately to DTE enabled, send no break to remote modem \K1 Break sent to remote Buffers cleared, break sent modem and buffered to DTE cleared \K2 Send break to remote Break sent immediately to DTE modem immediately \K3 Send break to remote Break sent immediately to DTE modem immediately CALLING TONE Type: Register Format: AT [cmds] S24=n [cmds] Description: Controls whether the DTE will allow the modem to send a 1300Hz calling tone when originating Command Function S24=0 Disable calling tone S24=1 Enable calling tone COMPRESSION Type: Configuration Format: AT [cmds] %Cn [cmds] Description: Selects data compression Command Function %C0 Data compression disabled %C1 MNP5 enabled CONNECT MODE Type: Configuration Format: AT [cmds] \Nn [cmds] Description: Controls the type of connection the modem will operate in Command Function \N0 Normal mode enabled \N1 Direct mode enabled \N2 MNP reliable mode enabled \N3 MNP auto-reliable mode enabled \N4 V.42 reliable mode enabled \N5 V.42 auto-reliable mode enabled \N6 Reliable mode enabled \N7 Auto-reliable mode enabled DCE LINE SPEED Type: Register Format AT [cmds] S28=n [cmds] Description: Sets the maximum allowable data exchange rate attempted during handshake process. Command Function S28=0 Speed of last connection S28=6 300bps S28=8 1200bps S28=9 2400bps S28=10 4800bps using V.32bis S28=11 7200bps using V.32bis S28=12 9600bps using V.32bis S28=13 12.0Kbps using V.32bis S28=14 14.4Kbps S28=15 16.8Kbps S28=16 19.2Kbps S28=17 21.6 Kbps S28=18 24 Kbps S28=19 26.4 Kbps S28=20 28.8Kbps DIAL Type: Immediate Format: AT [cmds] D<#> [cmds] Example: ATDT18005551212,,251 Description: Dials telephone number according to any modifiers included in the string Note: Any combination of modifiers can be used to produce the desired dial functions in sequence. Command Function L Re-dial last number P Pulse dialing enabled R Answer mode enabled. Originate mode disabled following handshake initiation. S=n Dial stored telephone number n T Tone dialing enabled W Dialing resumed following 2ND dial tone , Dialing paused for amount of time specified in S8 register ! Flash function initiated. Modem commanded to go off-hook for specified time before returning on-hook. @ Quiet Answer function enabled. Modem waits until a "quiet answer," a ring-back signal followed by silence up to the time specified in S7, is received prior to executing the rest of the dial string. ; Modem returned to command state after dialing. The semicolon can only be placed at the end of the dial command. DSVD Type: Configuration Format: AT [cmds] -Sxxx [cmds] Description: Controls Data Simultaneous Voice Data mode Command Function -SSE0 Disable DSVD mode -SSE1 Enable DSVD mode EXTENDED RESULT CODES Type: Configuration Format: AT [cmds] \Vn [cmds] Description: Selects extended result codes (MNP) Command Function \V0 Extended result codes (MNP) disabled \V1 Extended result codes (MNP) enabled FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] \Qn [cmds] Description: Sets type of flow control used by modem Command Function \Q0 Flow control disabled \Q3 Bi-directional RTS/CTS flow control enabled INACTIVITY TIMER Type: Configuration Format: AT [cmds] \Tn [cmds] Default: Unidentified Range: 0-90 Unit: 1 minute Description: Sets the length of time that the modem does not receive information before it disconnects. MAXIMUM BLOCK SIZE FOR TRANSMISSION Type: Configuration Format: AT [cmds] \An [cmds] Description: Sets the maximum transmittable block size Command Function \A0 MNP block size is 64 characters \A1 MNP block size is 128 characters \A2 MNP block size is 192 characters \A3 MNP block size is 256 characters MNP - STREAM/BLOCK MODE Type: Configuration Format: AT [cmds] \Ln [cmds] Description: Selects the transfer mode for MNP link Command Function \L0 Stream mode for MNP enabled \L1 Block mode for MNP enabled PAUSE Type: Immediate Format: AT [cmds] ,(comma) [cmds] Description: Pause for amount of time specified in S8 register. Can be used in dial string or the command string. REPORT INFORMATION Type: Immediate Format: AT [cmds] In [cmds] Description: Displays information requested Command Function I1 Reports OK I2 Reports OK I3 Reports modem ID I4 Reports product name STATUS-REGISTER Type: Configuration Format: Read: AT [cmds] Sn? [cmds] Write: AT [cmds] Sn=x [cmds] Description: Writes to or reads from a specified register Note: See the section on S-registers for detailed listing of commonly used S-registers. V.34 - BAUD RATE Type: Register Format: AT [cmds] S31=n [cmds] Description: Controls baud rate used by V.43 data pump Command Function S31=0 2400 baud rate disabled S31=1 2743 baud rate disabled S31=2 2800 baud rate disabled S31=3 3000 baud rate disabled S31=4 3200 baud rate disabled S31=5 3429 baud rate disabled S31=6 Asymmetric symbol rate disabled V.34 - DATA PUMP OPTIONS Type: Register Format: AT [cmds] S33=n [cmds] Description: Select V.34 data pump options Command Function S33=0 Asymmetric rate for V.34 disabled S33=1 Auxiliary channel for V.34 disabled S33=8 Power reduction disabled S33=9 Pre-emphasis disabled S33=10 Constellation warping disabled S33=11 Constellation shaping disabled S33=12 Precoding disabled V.34 - OPTIONS Type: Register Format: AT [cmds] S30=n [cmds] Description: Disables V.43 data pump at speeds higher than 14.4Kbps and enables V.32bis modem. Command Function S30=0 Call indicator disabled S30=1 V.8 disabled S30=2 V.34 disabled V.34 - SIGNAL PROCESSING OPTIONS Type: Register Format: AT [cmds] S34=n [cmds] Description: Controls signal processing for V.34 data pump Command Function S34=0 Request for power reduction disabled S34=1 Request for pre-emphasis disabled S34=2 Request for constellation warping disabled S34=3 Request for constellation shaping disabled S34=4 Request for precoding disabled V.42bis - COMPRESSION CONTROL Type: Configuration Format: AT [cmds] "Hn [cmds] Description: Controls V.42bis data compression Command Function "H0 V.42bis disabled "H1 V.42bis when transmitting enabled "H2 V.42bis when receiving enabled "H3 V.42bis when transmitting/receiving enabled V.42bis - DICTIONARY SIZE Type: Configuration Format: AT [cmds] "Nn [cmds] Description: Select V.42 dictionary size Command Function "N0 Select 512 bytes "N1 Select 1024 bytes "N2 Select 2048 bytes V.42bis - MAXIMUM STRING LENGTH Type: Immediate Format: AT [cmds] "On [cmds] Default: 32 Range: 6-250 Unit: Characters Description: Selects string size for V.42bis compression