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# 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 Bell 103/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.32,
V.32bis, V.34
Fax Modulation Unidentified
Protocol
Error MNP5, V.42, V.42bis
Correction/Compression
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 |
| | enabled, send no | to DTE |
| | break to remote modem | |
|-----------+-----------------------+------------------------|
| \K1 | Break sent to remote | Buffers cleared, break |
| | modem and buffered | sent to DTE |
| | cleared | |
|-----------+-----------------------+------------------------|
| \K2 | Send break to remote | Break sent immediately |
| | modem immediately | to DTE |
|-----------+-----------------------+------------------------|
| \K3 | Send break to remote | Break sent immediately |
| | modem immediately | to DTE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| í 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 |
|------------+-----------------------------------------------|
| í 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 |
|------------+-----------------------------------------------|
| í 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 |
|---------------+--------------------------------------------|
| í 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 |