
E-TECH RESEARCH, INC.

PC288MX (REV. 2)

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     8-bit ISA
Fax Class                    Class I
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.21, V.22, V.22bis, V.23, V.32,
                             V.32bis, V.34

                             AT&T V.32terbo
Fax Modulation Protocol      ITU-T V.17, V.21Ch2, V.27ter, V.29
Error Correction/Compression MNP5, V.42, V.42bis

[Image]

                                CONNECTIONS

         Purpose           Location            Purpose           Location

  Line out                    CN1       Line in                    CN2

                        BASE I/O ADDRESS SELECTION

      Port          SW1/1          SW1/2          SW1/3         SW1/5

  COM1: (3F8h)        On            Off            On            Off

  COM2: (2F8h)        On            Off            Off            On

  COM3: (3E8h)       Off            On             On            Off

  COM4: (2E8h)       Off            On             Off            On

            INTERRUPT SELECTION

   IRQ    SW1/4    SW1/6    SW1/7    SW1/8

    2      Off      Off      Off      On

    3      Off       On      Off      Off

    4       On      Off      Off      Off

    5      Off      Off      On       Off

                         Proprietary AT Command Set

                          AUTO FALLBACK CHARACTER

  Type:          Register

  Format:        AT [cmds] S43=n [cmds]

  Example:       AT S43=13 <CR>

  Description:   Set auto fallback character during MNP negotiation.
                 (%An)

  Notes          S43=0, disabled. S43=(1 - 127), enabled.

                        AUTO FALL FORWARD/FALLBACK

  Type:          Configuration

  Format:        AT [cmds] %Gn [cmds]

  Example:       AT %G &W <CR>

  Description:   Selects auto fallback.

    Command                              Function

      %G0        Fallback disabled.

   %G1          Fallback enabled.

                     AUTO-RELIABLE FALLBACK CHARACTER

  Type:              Configuration

  Format:            AT [cmds] %An [cmds]

  Example:           AT%A20<CR>

  Default:           13

  Range:             0-127

  Unit:              ASCII.

  Description:       Sets the character used as the auto-reliable
                     fallback character. %A0 will disable this function.

                  AUTO-RELIABLE TIME BUFFER CONFIGURATION

  Type:            Configuration

  Format:          AT [cmds] \Cn [cmds]

  Example:         AT \C1 &W<CR>

  Description:     Controls the handling of incoming data during
                   auto-reliable time period.

     Command                              Function

   \CO            Data is discarded.

       \C1         Data is buffered.

       \C2         Data is discarded, sets to normal mode and sends
                   auto-reliable character to serial port.

                               AUTO-RETRAIN

  Type:          Configuration

  Format:        AT %En

  Example:       AT %E1 <CR>

  Description:   Selects auto-retrain mode.

    Command                              Function

      %E0        Auto-retrain disabled.

   %E1          Auto-retrain enabled.

      %E2        Do not hang up and auto-retrain disabled.

                             AUTO SLEEP TIMER

  Format                  AT [cmds] S46=n [cmds]

  Example:                AT S46= 100<CR>

  Default:                255

  Range:                  0 - 255

  Unit:                   .1 second.

  Description:            Maximum duration of DTE and DCE inactivity
                          allowed prior to initiating low-power sleep
                          mode. 255 = disable.

                          BIT-MAPPED REGISTER S14

  Format                   AT [cmds] S14? [cmds]

  Example:                 ATS14?<CR>

  Default:                 Read only

  Range:                   0-174

  Unit:                    Bit-mapped.

  Description:             Controls echo, result codes, result code
                           display, dial mode, and answer/originate mode.

       Bit          Value                       Meaning

        0             0       Not used.

        1              0      Command echo disabled.

                    1        Command echo enabled.

        2           0        Result codes enabled.

                      1       Result codes disabled.

        3              0      Display result codes in numeric format.

                    1        Display result codes in verbose format.

        4             0       Not used.

        5              0      Tone dial enabled.

                    1        Pulse dial enabled.

        6             0       Not used.

        7              0      Answer mode enabled.

                    1        Originate mode enabled.

                          BIT-MAPPED REGISTER S21

  Format              AT [cmds] S21? [cmds]

  Example:            ATS21?<CR>

  Default:            Read only

  Range:              0 - 124

  Unit:               Bit-mapped.

  Description:        Controls CTS, low DTR action, and DCD signal.

     Bit        Value                        Meaning

     1, 0        00      Not used.

      2         0       CTS follows RTS. Synchronous modes only.

                  1      CTS forced high.

     4, 3         00     DTR signal ignored.

                  01     Modem goes to command mode on low DTR.

                10      Modem disconnects on low DTR. Auto-Answer is
                         disabled.
                 11
                         Modem is initialized on low DTR.

      5           0      DCD forced high.

                1       DCD normal.

      6         0       DSR forced high.

                  1      DSR normal.

                          BIT-MAPPED REGISTER S22

  Format                    AT [cmds] S22? [cmds]

  Example:                  ATS22?<CR>

  Default:                  Read only

  Range:                    0 - 255

  Unit:                     Bit-mapped.

  Description:              Controls volume and speaker settings, result
                            codes, and make/break pulse ratio.

       Bit           Value                       Meaning

       1, 0            00       Lowest volume setting.

                       01       Low volume setting.

                     10        Medium volume setting

                       11       Highest volume setting.

       3, 2            00       Speaker disabled.

                     01        Speaker enabled until carrier signal
                                detected
                       10
                                Speaker enabled.
                       11
                                Speaker enabled following dialing, then
                                disabled after carrier signal detected.

     6, 5 ,4           000      Busy and dialtone detection disabled.

                       100      Busy and dialtone detection disabled.

                       101      Busy tone detection disabled, dialtone
                                detection enabled.
                       110
                                Busy tone detection enabled, dialtone
                     111       detection disabled.

                                Busy and dialtone detection enabled.

        7            0         Pulse dialing at 39/61ms at 10pps.

                       1        Pulse dialing at 33/67ms at 10pps.

                          BIT-MAPPED REGISTER S23

  Format                   AT [cmds] S23? [cmds]

  Example:                 ATS23?<CR>

  Default:                 Read only

  Range:                   0-241

  Unit:                    Bit-mapped.

  Description:             Grants/denies remote digital loopback,
                           controls parity, and sets guard tone.

       Bit            Value                      Meaning

        0               0       Remote digital loopback denied.

                     1         Remote digital loopback allowed.

     3, 2, 1           000      Not used.

       5,4              00      Parity even.

                     01        Parity Space.

                        10      Parity odd.

                       11       Parity Mark.

       7, 6          00        Guard tone disabled.

                        01      Guard tone 550Hz enabled.

                       10       Guard tone 1800Hz enabled.

                          BIT-MAPPED REGISTER S27

  Format                   AT [cmds] S27? [cmds]

  Example:                 AT S27? <CR>

  Default:                 Read only

  Range:                   0 - 127

  Unit:                    Bit-mapped.

  Description:             Selects sync/async mode, Line type, internal
                           clock, and ITU-T/Bell modes.

       Bit           Value                      Function

     3, 1, 0         000      Asynchronous mode, serial port speed
                               follows connect speed.
                      001
                               Asynchronous command mode and synchronous
                      010      connect mode.

                      011      Asynchronous command mode and synchronous
                               connect mode, DTR dialing enabled.
                      100
                               Asynchronous command mode on low DTR,
                               synchronous connect mode on high DTR.

                               Hayes AutoSync&trade; mode - serial port
                               locked at 9600bps.

        2            0        Dial up line.

                       1       Leased line.

       5, 4          00       Internal DTE transmit clock source.

                       01      External DTE transmit clock source.

                      10       Slave DTE transmit clock source.

        6              0       CCITT mode.

                     1        Bell mode.

                          BIT-MAPPED REGISTER S44

  Format              AT [cmds] S44? [cmds]

  Example:            AT S44? <CR>

  Default:            Read only.

  Range:              0-23

  Unit:               Bit-mapped.

  Description:        Selects V.42 status, V.42bis, and fallback.

     Bit        Value                        Meaning

      0           0      V.42bis status disabled.

                1       V.42bis status enabled.

     2, 1         00     V.42bis disabled.

                  01     V.42bis when transmitting enabled.

                  10     V.42bis when receiving enabled.

                11      V.42bis when transmitting/receiving enabled.

      3           0      Not used.

      4           0      Fallback disabled.

                1       Fallback enabled.

                          BIT-MAPPED REGISTER S51

  Format                    AT [cmds] S51? [cmds]

  Example:                  AT S51? <CR>

  Default:                  Read only.

  Range:                    0 - 115

  Unit:                     Bit-mapped.

  Description:              Display flow control.

       Bit           Value                       Meaning

     2, 1, 0           000      Flow control disabled.

                       001      XON/XOFF flow control enabled.

                       010      CTS flow control to DTE enabled.

                     011       RTS/CTS flow control enabled.

        3              0        Not used.

        4            0         Flow control disabled.

                       1        Flow control to XON/XOFF flow enabled.

        5            0         Serial speed locked.

                       1        Serial speed follows connect speed.

       7, 6          00        XON/XOFF signals trapped by local modem.

                       01       XON/XOFF passed through local modem.

                          BIT-MAPPED REGISTER S54

  Format                  AT [cmds] S54? [cmds]

  Example:                AT S54? <CR>

  Default:                Read only.

  Range:                  0 - 131

  Unit:                   Bit-mapped

  Description:            Displays the communication protocol for data
                          calls, and protocol result code.

      Bit           Value                       Meaning

       0              0       B2 is enabled.

                      1       B2 is not enabled.

       1              0       B3 is enabled

                      1       B3 is not enabled.

     6 - 2            0       Not used.

       7              0       Protocol result code disabled.

                      1       Protocol result code enabled.

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Example:       AT \B3 &W<CR>

  Range:         1-9

  Unit:          100 ms.

  Description:   Sends break to modem.

                                BREAK TYPE

  Type:           Configuration

  Format:         AT [cmds] \Kn [cmds]

  Example:        AT \K1 <CR>

  Description:    Configures action of break signal.

     Command        Break from DTE      Break from DTE      Break from
                                                           remote modem
                    Reliable/Normal      Direct mode
                         mode

       \K0        Enter command        Send break to     Buffers cleared
                  mode, do not send    remote modem      and break sent
                  break to remote      immediately,      to DTE.
                  modem.               then enter
                                       command mode.

       \K1        Buffers cleared      Send break to     Buffers cleared
                  and break sent to    remote modem      and break sent
                  remote modem.        immediately.      to DTE.

       \K2        Enter command        Send break to     Send break to
                  mode, do not send    remote modem      DTE immediately.
                  break to remote      immediately,
                  modem.               then enter
                                       command mode.

       \K3        Send break to        Send break to     Send break to
                  remote modem         remote modem      DTE immediately.
                  immediately.         immediately.

       \K4        Enter command        Send break to     Break sent with
                  mode, do not send    remote modem      received data to
                  break to remote      immediately,      the DTE.
                  modem.               then enter
                                       command mode.

   \K5           Send break with      Send break to     Break sent with
                  transmitted data.    remote modem      received data to
                                       immediately.      the DTE.

                                COMPRESSION

  Type:          Configuration

  Format:        AT %Cn

  Example:       AT *EC0 %C1 *AP0<CR>

  Description:   Selects data compression.

    Command                              Function

      %C0        Data compression disabled.

      %C1        MNP 5 enabled.

      %C2        V.42bis enabled.

   %C3          MNP 5 and V.42bis enabled.

                                COMPRESSION

  Type:          Configuration

  Format:        AT $Cn

  Example:       AT *EC0 $C1 *AP0<CR>

  Description:   Selects data compression.

    Command                              Function

      $C0        Data compression disabled.

   $C1          Data compression enabled.

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] \Nn [cmds]

  Example:       AT \N1 DT555-1212<CR>

  Description:   Sets connect mode.

    Command                              Function

      \N0        Normal mode enabled.

      \N1        Direct mode enabled.

      \N2        MNP mode only enabled.

   \N3          LAP-M mode with fallback to MNP and normal modes
                 enabled.

      \N4        LAP-M mode with fallback to MNP enabled.

      \N5        LAP-M mode only enabled.

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] $En [cmds]

  Example:       AT $E1 DT555-1212<CR>

  Description:   Sets connect mode.

    Command                              Function

      $E0        Normal mode enabled.

      $E1        MNP mode with fallback to normal mode enabled.

      $E2        MNP mode only enabled.

   $E3          LAP-M mode with fallback to MNP and normal modes
                 enabled.

      $E4        LAP-M mode only enabled.

                       DISPLAY AUTO-RELIABLE BUFFER

  Type:             Register

  Format:           AT [cmds] S48? [cmds]

  Example:          AT S48? <CR>

  Default:          Read only.

  Description:      Displays auto-reliable buffer settings. (\Cn)

       Value                               Meaning

   0               Data is discarded.

         1          Data is buffered.

         2          Data is discarded, modem returns to normal mode on
                    receiving auto-reliable fallback character.

                          DISPLAY CONNECT MESSAGE

  Type:          Register

  Format         AT [cmds] S41? [cmds]

  Example:       AT S41? <CR>

  Default:       Read only.

  Description:   Connect message display. (Wn)

     Value                               Meaning

   0            Connect with DTE speed.

       1         Connect with carrier, protocol, and compression.

       2         Connect with DCE speed.

                           DISPLAY FAX/DATA MODE

  Type:          Register

  Format:        AT [cmds] S50? [cmds]

  Example:       AT S50?<CR>

  Default:       Read only.

  Description:   Displays data or FAX mode.

     Value                               Meaning

   0            Data mode enabled.

       1         FAX mode enabled.

                         DISPLAY FLOW CONTROL TYPE

  Type:          Register

  Format:        AT [cmds] S52?[cmds]

  Example:       AT S52?<CR>

  Default:       Read only.

  Description:   Displays type of flow control used by modem. (&Kn)

     Value                               Meaning

     S52=0       Flow control disabled.

     S52=1       Not used.

     S52=2       Not used.

   S52=3        CTS/RTS flow control enabled.

     S52=4       XON/XOFF pass-through flow control enabled.

                        DISPLAY MAXIMUM BLOCK SIZE

  Type:          Register

  Format:        AT [cmds] S49? [cmds]

  Example:       AT S49?<CR>

  Default:       Read only.

  Description:   Displays maximum block size. (\An)

     Value                               Meaning

       63        Maximum MNP block size is 64 characters.

      127        Maximum MNP block size is 128 characters.

      191        Maximum MNP block size is 192 characters.

   255          Maximum MNP block size is 256 characters.

       31        Maximum MNP block size is 32 characters.

                       DISPLAY MODEM OPERATING MODE

  Type:          Register

  Format:        AT [cmds] S53? [cmds]

  Example:       AT S53? <CR>

  Default:       Read only.

  Description:   Displays connect mode. (\Nn)

     Value                               Meaning

       0         Normal mode enabled.

       1         Direct mode enabled.

       2         MNP reliable mode enabled.

       4         LAP-M mode enabled.

       6         LAP-M mode with fallback to MNP enabled.

   7            LAP-M, MNP, or Normal mode enabled.

                            DISPLAY MNP OPTIONS

  Format         AT [cmds] S59? [cmds]

  Example:       AT S59?<CR>

  Default:       Read only.

  Description:   Displays MNP5 status. (%Cn)

     Value                               Meaning

       0         Data compression disabled.

       1         MNP 5 enabled.

       2         V.42bis enabled.

   3            MNP 5 and V.42bis enabled.

                     DISPLAY PROTOCOL - V.42 DETECTION

  Format                     AT [cmds] S40? [cmds]

  Example:                   AT S40? <CR>

  Default:                   Read-only

  Range:                     0-65

  Unit:                      Bit-mapped.

  Description:               Controls active protocols and V.42
                             detection. (Nn and -Jn)

        Bit           Value                      Meaning

         0              0            Automatic mode-detection disabled

                     1              In originate mode, handshake begins
                                     at line speed designated by the S37
                                     register. Modem can shift to a
                                     slower speed if necessary.

                                     In answer mode, handshake attempted
                                     with the following protocols in
                                     order - V.32terbo, V.32bis, V.32,
                                     V.22bis, V.22 or Bell 212, V.21, and
                                     Bell 103

       5 - 1            0       Not used.

         6              0       V.42 detection disabled.

                     1         V.42 detection enabled.

                           DISPLAY V.32 RETRAIN

  Type:             Register

  Format:           AT [cmds] S42?[cmds]

  Example:          AT S42? <CR>

  Default:          Read only.

  Description:      Selects action the modem will take during bad line
                    quality on V.32/32bis connection. (%En)

      Value                                Meaning

        0           Auto-retrain disabled, hang up.

        1           Auto-retrain on line quality problem enabled.

        2           Modem ignores line quality problems.

                              DTE RATE STATUS

  Type:          Register

  Format:        AT [cmds] S62? [cmds]

  Example:       AT S62? <CR>

  Default:       Read only.

  Description:   Displays DTE rate.

     Value                               Meaning

       0         300 bps.

       1         600 bps.

       2         1200 bps.

       3         2400 bps.

       4         4800 bps.

       5         7200 bps.

       6         9600 bps.

       7         12Kbps.

       8         14.4Kbps.

       9         16.8Kbps.

       10        19.2Kbps.

       11        21.6Kbps.

       12        24Kbps.

       13        26.4Kbps.

       14        28.8Kbps.

       15        38.4Kbps.

   16           57.6Kbps.

       17        115.2Kbps.

                               FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] \Gn [cmds]

  Example:       AT \G1 &K3<CR>

  Description:   Selects modem port flow control.

    Command                              Function

   \G0          Flow control disabled.

      \G1        Flow control enabled.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] \Qn [cmds]

  Example:       AT \Q0 A <CR>

  Description:   Sets type of flow control used by modem.

    Command                              Function

      \Q0        Flow control disabled.

      \Q1        XON/XOFF flow control enabled.

      \Q2        CTS flow control to DTE enabled.

   \Q3          RTS/CTS flow control enabled.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] $Fn [cmds]

  Example:       AT &G1 $F3 <CR>

  Description:   Sets type of flow control used by modem.

    Command                              Function

      $F0        XON/XOFF flow control enabled.

      $F1        XON/XOFF pass-through flow control enabled.

   $F4          CTS/RTS flow control enabled.

      $F5        Flow control disabled.

                             INACTIVITY TIMER

  Type:                Configuration

  Format:              AT [cmds] \Tn [cmds]

  Example:             AT\T20<CR>

  Default:             0

  Range:               1-90

  Unit:                1 minute.

  Description:         Sets the length of time that the modem does not
                       receive information before it disconnects. \T0
                       disables the timer.

                          LOCAL SERIAL PORT SPEED

  Type:          Configuration

  Format:        AT [cmds] S72=n [cmds]

  Example:       AT S72=00 *OS0 *SC1<CR>

  Description:   Sets serial port speed.

    Command                              Function

   S72=0        Sets speed automatically.

     S72=1       Sets 300bps speed.

     S72=2       Sets 600bps speed.

     S72=3       Sets 1200bps speed.

     S72=4       Sets 2400bps speed.

     S72=5       Sets 4800bps speed.

     S72=6       Sets 7200bps speed.

     S72=7       Sets 9600bps speed.

     S72=8       Sets 12Kbps speed.

     S72=9       Sets 14.4Kbps speed.

     S72=10      Sets 16.8Kbps speed.

     S72=11      Sets 19.2Kbps speed.

     S72=12      Sets 21.6Kbps speed.

     S72=13      Sets 24Kbps speed.

     S72=14      Sets 26.4Kbps speed.

     S72=15      Sets 28.8Kbps speed.

     S72=16      Sets 38.4Kbps speed.

     S72=17      Sets 57.6Kbps speed.

     S72=18      Sets 115.2Kbps speed.

                             LOCK SERIAL PORT

  Type:          Configuration

  Format:        AT [cmds] \Jn [cmds]

  Example:       AT %L3 %B14 \J0<CR>

  Description:   Sets operation of serial port speed.

    Command                              Function

   \J0          Serial speed locked.

      \J1        Serial speed follows connect speed.

                              LOOPBACK TESTS

  Format              AT [cmds] S16=n [cmds]

  Example:            ATS16=32<CR>

  Default:            0

  Range:              0 - 125

  Unit:               Bit-mapped.

  Description:        Enables loopback tests.

     Bit        Value                        Function

      0         0       Local analog loopback test disabled.

                  1      Local analog loopback test enabled.

      1           0      Not used.

      2         0       Local digital loopback test disabled.

                  1      Local digital loopback test enabled.

      3         0       Modem is not performing remote digital loopback
                         test.
                  1
                         Modem is performing remote digital loopback
                         test.

      4         0       Remote digital loopback test disabled.

                  1      Remote digital loopback test enabled.

      5         0       Remote digital loopback with local self-test
                         disabled.
                  1
                         Remote digital loopback with local self-test
                         enabled.

      6         0       Local analog loopback with local self-test
                         disabled.
                  1
                         Local analog loopback with local self-test
                         enabled.

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:          Configuration

  Format:        AT [cmds] \An [cmds]

  Example:       AT \A3 &MB28800<CR>

  Description:   Sets the maximum transmittable block size.

    Command                              Function

      \A0        Maximum MNP block size is 64 characters.

      \A1        Maximum MNP block size is 128 characters.

      \A2        Maximum MNP block size is 192 characters.

   \A3          Maximum MNP block size is 256 characters.

      \A4        Maximum MNP block size is 32 characters.

                           PROTOCOL RESULT CODE

  Type:          Configuration

  Format:        AT [cmds] \Vn [cmds]

  Example:       AT \V0 Q0 <CR>

  Description:   \V responds when conjunction with W0 and W2 commands.

    Command                              Function

      \V1        Protocol result code disabled.

   \V0          Protocol result code enabled.

                              PROTOCOL/SPEED

  Type:          Register

  Format:        AT [cmds] S37n [cmds]

  Example:       AT S37=00 <CR>

  Description:   Selects the current DCE speed.

     Value                               Meaning

   S37=0        Select last ATspeed.

     S37=3       Select 300bps speed.

     S37=5       Select 1200bps speed.

     S37=6       Select 2400bps speed.

     S37=7       Select 4800bps speed.

     S37=8       Select 7200bps speed.

     S37=9       Select 9600bps speed.

     S37=10      Select 12Kbps speed.

     S37=11      Select 14.4Kbps speed.

     S37=12      Select 16.8Kbps speed.

     S37=13      Select 19.2Kbps speed.

     S37=14      Select 21.6Kbps speed.

     S37=15      Select 24Kbps speed.

     S37=16      Select 26.4Kbps speed.

     S37=17      Select 28.8Kbps speed.

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Example:       AT I1 O<CR>

  Description:   Displays modem properties.

    Command                              Function

       I0        Reports product code.

       I1        Reports 3-digit ROM checksum result.

       I2        Reports OK.

       I3        Reports firmware version.

       I4        Reports OEM string.

       I5        Reports country code.

       I9        Reports checksum result of Flash-ROM.

                             ROUND TRIP DELAY

  Type:          Register

  Format:        AT [cmds] S65? [cmds]

  Example:       AT S65? <CR>

  Default:       Read only.

  Units:         .1 second.

  Description:   Displays the round trip delay.

                           V.42 DETECTION PHASE

  Type:          Configuration

  Format:        AT [cmds] -Jn [cmds]

  Example:       AT -J1 &W<CR>

  Description:   Controls V.42 detection.

    Command                              Function

      -J0        V.42 detection disabled.

   -J1          V.42 detection enabled.

                        V.42bis COMPRESSION CONTROL

  Type:          Configuration

  Format:        AT [cmds] "Hn [cmds]

  Example:       AT "H3 &W<CR>

  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]

  Example:       AT "N2 &W<CR>

  Description:   Controls V.42 dictionary size.

    Command                              Function

      "N0        512 bytes.

      "N1        1024 bytes.

   "N2          1536 bytes.

                          V.42bis DICTIONARY SIZE

  Type:          Register

  Format:        AT [cmds] S57? [cmds]

  Example:       AT S57? <CR>

  Default:       Read only.

  Description:   Displays V.42bis dictionary size. ("Nn)

     Value                               Meaning

       0         512 bytes.

       1         1024 bytes.

   2            1536 bytes.

                       V.42bis MAXIMUM STRING LENGTH

  Type:          Immediate

  Format:        AT [cmds] "On [cmds]

  Example:       AT "O32 <CR>

  Default:       32

  Range:         6 - 64

  Unit:          Unidentified.

  Description:   Selects string size for V.42bis compression.

                           XON/XOFF PASS-THROUGH

  Type:          Configuration

  Format:        AT [cmds] \Xn [cmds]

  Example:       AT \X7 O<CR>

  Description:   Selects whether XON/XOFF signals are sent to remote
                 modem.

    Command                              Function

   \X0          XON/XOFF signals trapped by local modem.

      \X1        XON/XOFF passed through local modem.

