
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

