
MEGAHERTZ CORPORATION

A2144

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            14.4Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     PCMCIA Type II
Fax Class                    Class II
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32b,
                             V.32bis
Fax Modulation Protocol      ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression MNP10, MNP5, V.42, V.42bis

                                                                      V1283

                         Proprietary AT Command Set

                          BIT-MAPPED REGISTER S14

  Format                   AT [cmds] S14=n [cmds]

  Example:                 ATS14=138<CR>

  Default:                 138

  Range:                   0 - 174

  Unit:                    Bit-mapped

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

       Bit         Value                       Function

        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=n [cmds]

  Example:                   AT S21=169 <CR>

  Default:                   4

  Range:                     0 - 253

  Unit:                      Bit-mapped

  Description:               Controls jack type, CTS signal, low DTR
                             action, DCD signal, DSR signal, and the Long
                             Space Disconnect function.

        Bit          Value                       Function

         0            0         Selects RJ-11, RJ-41S, or RJ45S jack.

                     1           Selects RJ-12 or RJ-13 jack.

         1           0           Not used.

         2           0           CTS follows RTS.

                      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.

         7            0         Long Space Disconnect function disabled.

                     1           Long Space Disconnect function enabled.

                          BIT-MAPPED REGISTER S22

  Format                    AT [cmds] S22=n [cmds]

  Example:                  AT S22=89 <CR>

  Default:                  117

  Range:                    0 - 127

  Unit:                     Bit-mapped

  Description:              Controls speaker volume and controls, and
                            result codes.

       Bit          Value                       Function

       1, 0         00          Off volume.

                     01        Low volume.

                    10          Medium level volume.

                    11          High level volume.

       3, 2         00          Speaker off.

                     01        Speaker off on carrier.

                    10          Speaker always on.

                    11          Speaker on during handshake.

     6, 5, 4        000         Basic result codes only enabled.

                    100         Basic and connection speed result codes
                                enabled.
                    101
                                Basic and connection speed result codes
                    110         and dialtone detection enabled.

                     111       All result codes except dialtone
                                detection enabled.

                                All result codes enabled.

                          BIT-MAPPED REGISTER S23

  Format                   AT [cmds] S23=n [cmds]

  Example:                 ATS23=152<CR>

  Default:                 183

  Range:                   0 - 255

  Unit:                    Bit-mapped

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

        Bit         Value                       Function

         0          0           Remote digital loopback denied.

                     1         Remote digital loopback allowed.

      3, 2, 1       000         Sets serial port speed to 0-300bps.

                    001         Sets serial port speed to 600bps.

                    010         Sets serial port speed to 1200bps.

                     011       Sets serial port speed to 2400bps.

                    100         Sets serial port speed to 4800bps.

                    101         Sets serial port speed to 9600bps.

                    110         Sets serial port speed to 19200bps.

        5,4         00          Parity even.

                    01          Not used.

                    10          Parity odd.

                     11        No parity.

       7, 6         00          Guard tone disabled.

                    01          Guard tone disabled.

                     10        Guard tone 1800Hz enabled.

                          BIT-MAPPED REGISTER S27

  Format                   AT [cmds] S27=n [cmds]

  Example:                 AT S27=8 <CR>

  Default:                 9

  Range:                   0 - 127

  Unit:                    Bit-mapped

  Description:             Controls connection mode, line type, internal
                           clock, and protocols.

       Bit          Value                       Function

     3, 1, 0        000        Asynchronous mode, serial port speed
                               follows connect speed.
                    001
                               Asynchronous off-line command mode and
                     101      synchronous connect mode.

                    110        Error-correcting mode.

                               Asynchronous mode, serial port speed
                               locked.

        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        ITU-T protocols.

                    1          Bell protocols.

                          BIT-MAPPED REGISTER S28

  Format                   AT [cmds] S28=n [cmds]

  Example:                 AT S28=8 <CR>

  Default:                 0

  Range:                   0 - 31

  Unit:                    Bit-mapped

  Description:             Controls V.23 split speed, V.23 split screen,
                           V.23 half duplex, and pulse dialing.

      Bit         Value                        Function

       0           0          V.23 split speed operation disabled.

                  1            V.23 split speed operation enabled.

       1           0          Select 75bps transmit, 1200bps receive.

                  1            Select 1200bps transmit, 75bps receive.

       2           0          1200bps transmit , 1200bps receive
                               disabled.
                  1
                               1200bps transmit , 1200bps receive
                               enabled.

      4, 3         00         39ms make/61ms break at 10pps.

                  01           33ms make/67ms break at 10pps.

                  10           39ms make/61ms break at 20pps.

                  11           33ms make/67ms break at 20pps.

                          BIT-MAPPED REGISTER S31

  Format                 AT [cmds] S31=n [cmds]

  Example:               AT S31=69 <CR>

  Default:               0

  Range:                 0 - 255

  Unit:                  Bit-mapped

  Description:           Controls auto-baud function and result codes.

     Bit        Value                         Function

      0         0           Not used.

      1         0           Auto-baud disabled.

                 1         Auto-baud enabled.

      2          00        DTE speed displayed in result codes.

                01          Extended result codes enabled and DCE speed
                            displayed in result codes.
                10
                            DCE speed displayed in result codes.

                          BIT-MAPPED REGISTER S40

  Format                   AT [cmds] S40=n [cmds]

  Example:                 AT S40=155 <CR>

  Default:                 105

  Range:                   0 - 255

  Unit:                    Bit-mapped

  Description:             Controls power level and break handling,
                           MNP10, link negotiation, and block size.

       Bit          Value                       Function

        0               0      MNP10 disabled.

                     1        MNP10 enabled.

        1            0        Power level adjustment enabled.

                    1          Power level adjustment disabled.

        2            0        Link will be negotiated at highest
                               possible speed.
                    1
                               Link will be negotiated at 1200bps.

     5, 4, 3        000        Selects \K0.

                    001        Selects \K1.

                    010        Selects \K2.

                    011        Selects \K3.

                    100        Selects \K4.

                     101      Selects \K5.

       7, 6         00         MNP block size is 64 characters.

                     01       MNP block size is 128 characters.

                    10         MNP block size is 192 characters.

                    11         MNP block size is 256 characters.

                          BIT-MAPPED REGISTER S41

  Format                AT [cmds] S41=n [cmds]

  Example:              AT S41=18 <CR>

  Default:              3

  Range:                0 - 31

  Unit:                 Bit-mapped

  Description:          Selects compression, auto-retrain, flow control,
                        and MNP mode.

      Bit       Value                         Function

     1 - 0      00          Data compression disabled.

                01          MNP5 enabled.

                10          V.42bis enabled.

                 11        MNP5 and V.42bis enabled.

       2         0         Auto-retrain disabled.

                1           Auto-retrain enabled.

       3         0         Flow control disabled.

                1           Flow control enabled.

       4         0         Stream mode for MNP.

                1           Block mode for MNP.

                          BIT-MAPPED REGISTER S80

  Format                   AT [cmds] S80=n [cmds]

  Example:                 AT S80=223< CR>

  Default:                 0

  Range:                   0 - 224

  Unit:                    Bit-mapped

  Description:             Controls command sets, remote configuration,
                           and call back security. Also accesses EPROM
                           data lines.

        Bit         Value                       Function

       0 - 4        N/A         EPROM data lines.

         5           0         AT command set enabled.

                    1           V.25bis command set enabled.

         6           0         Remote configuration disabled.

                    1           Remote configuration enabled.

         7           0         Call back security disabled.

                    1           Call back security enabled.

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Example:       AT \B3 &W<CR>

  Range:         1 - 9

  Unit:          .1 Second

  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      Modem receives     Break received
                                             \B             from remote
                                                               modem

       \K0          Online command     Break sent to      Buffers
                    mode enabled,      remote modem and   cleared, break
                    send no break to   buffered           sent to DTE.
                    remote modem.      cleared.

       \K1          Break sent to      Break sent to      Buffers
                    remote modem and   remote modem and   cleared, break
                    buffered           buffered           sent to DTE.
                    cleared.           cleared.

       \K2          Online command     Send break to      Break sent
                    mode enabled,      remote modem       immediately to
                    send no break to   immediately.       DTE.
                    remote modem.

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

       \K4          Online command     Send break with    Break sent with
                    mode enabled,      transmitted        received data
                    send no break to   data.              to the DTE.
                    remote modem.

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

                          CONFIGURATION PROFILES

  Type:          Immediate

  Format:        AT [cmds] \Sn [cmds]

  Example:       AT\S0 <CR>

  Description:   Displays active configuration profiles.

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] \Nn [cmds]

  Example:       AT \N3 DT555-1212<CR>

  Description:   Sets connect mode.

    Command                              Function

      \N0        Normal mode enabled.

      \N2        Reliable mode enabled.

      \N3        Auto-reliable mode enabled.

      \N4        LAPM mode enabled.

      \N5        MNP mode enabled.

                          DISPLAY STORED NUMBERS

  Type:          Immediate

  Format:        AT [cmds] \Fn [cmds]

  Example:       AT \F2=9W1-303-555-1212 \F?<CR>

  Description:   Displays all stored phone numbers.

                        ERROR CORRECTION REJECTION

  Format                  AT [cmds] S36=n [cmds]

  Example:                AT S36=3 <CR>

  Default:                7

  Range:                  0 - 7

  Unit:                   Bit-mapped

  Description:            Configures the modems behavior if an
                          error-correcting connection cannot be made.

      Bit         Value                        Function

     0 - 2        000         Modem disconnects.

                  001         Modem attempts direct connection.

                  011         Modem attempts normal connection.

                  100         Modem attempts MNP connection.

                  101         Modem attempts MNP connection. If it fails,
                              modem attempts direct connection.
                   111
                              Modem attempts MNP connection. If it fails,
                              modem attempts normal connection.

                         FLASH DIAL MODIFIER TIME

  Format                AT [cmds] S29=n [cmds]

  Example:              AT S29=26 <CR>

  Default:              0

  Range:                0 - 255

  Unit:                 10 ms

  Description:          Time the modem will go on-hook upon receiving the
                        ! dial modifier in dial string.

                               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 CHARACTER - XOFF

  Type:          Register

  Format:        AT [cmds] S33=n [cmds]

  Example:       ATS33=34 <CR>

  Default:       19

  Range:         0 - 255

  Unit:          ASCII

  Description:   Sets the character used to represent XOFF.

                       FLOW CONTROL CHARACTER - XON

  Type:          Register

  Format:        AT [cmds] S32=n [cmds]

  Example:       ATS32=86 <CR>

  Default:       17

  Range:         0 - 255

  Unit:          ASCII

  Description:   Sets the character used to represent XON.

                             HANDSHAKE OPTIONS

  Type:          Configuration

  Format:        AT [cmds] S48=n [cmds]

  Example:       AT S48=7 <CR>

  Default:       7

  Range:         0, 7, or 128

  Description:   Controls the V.42 handshake sequence.

    Command                              Function

     S48=0       V.42 negotiation disabled.

     S48=7       V.42 negotiation enabled.

    S48=128      V.42 disabled; fallback according to S36.

                      LEASED LINE TRANSMISSION LEVEL

  Type:          Configuration

  Format:        AT [cmds] S99=n [cmds]

  Example:       AT S99=8 <CR>

  Default:       10

  Range:         0 - 15

  Unit:          -1 dBm

  Description:   Sets the signal level for transmission when in
                 leased-line mode.

                                 LINE TYPE

  Type:          Configuration

  Format:        AT [cmds] %Mn [cmds]

  Example:       AT %M0 H1 DT555-1212<CR>

  Description:   Selects line type.

    Command                              Function

      %M0        Switched line.

      %M1        Leased line.

                    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.

                           MNP STREAM/BLOCK MODE

  Type:          Configuration

  Format:        AT [cmds] \Ln [cmds]

  Example:       AT \L1 DT555-1212<CR>

  Description:   Selects the transfer mode for MNP.

    Command                              Function

      \L0        Stream mode for MNP enabled.

      \L1        Block mode for MNP enabled.

                             MNP10 COMPRESSION

  Type:          Configuration

  Format:        AT [cmds] -Kn [cmds]

  Example:       AT %C1 -K1 -Q0 <CR>

  Description:   Selects MNP10 data compression.

  Command                                Function

  -K0            MNP10 disabled.

  -K1            MNP10 enabled.

  -K2            MNP10 enabled on originate mode only.

                              PROTOCOL/SPEED

  Type:          Configuration

  Format:        AT [cmds] Fn [cmds]

  Example:       AT F0 A<CR>

  Description:   Selects the current protocol and speed.

    Command                              Function

       F0        Auto-select fastest common protocol.

       F1        V.21/Bell 103A 300bps.

       F3        V.23 1200/75bps.

       F4        V.22/Bell 212A 1200bps.

       F5        V.22bis.

       F6        V.32bis/V.32 4800bps.

       F7        V.32bis 7200bps.

       F8        V.32 9600bps

       F9        V.32bis 12Kbps

      F10        V.32bis 14.4Kbps

                              PROTOCOL/SPEED

  Format                AT [cmds] S37=n [cmds]

  Example:              AT S37=0 <CR>

  Default:              0

  Range:                0 - 15

  Unit:                 Bit-mapped

  Description:          Selects the current protocol and speed.

     Bit        Value                         Function

    3 - 0        0000     Auto-select fastest common protocol.

                0001       V.21/Bell 103A 300bps.

                0010       V.21/Bell 103A 300bps.

                0011       V.21/Bell 103A 300bps.

                0100       Not used.

                0101       V.22.

                0110       V.22bis.

                0111       V.23 1200/75bps.

                1000       V.32bis/V.32 4800bps.

                1001       V.32 9600bps.

                1010       V.32bis 12Kbps.

                1011       V.32bis 14.4Kbps.

                1100       V.32bis 7200bps.

                                SLEEP TIMER

  Format                  AT [cmds] S24=n [cmds]

  Example:                AT S24=40 <CR>

  Default:                1

  Range:                  0 - 255

  Unit:                   10 ms

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

                                TEST MODES

  Format                  AT [cmds] S16=n [cmds]

  Example:                AT S16=113<CR>

  Default:                0

  Range:                  0 - 125

  Unit:                   Bit-mapped

  Description:            Controls loopback tests, analog, digital,
                          remote digital, and self tests.

      Bit         Value                        Function

       0             0       Local analog loopback not in progress.

                    1        Local analog loopback in progress.

       1            0        Not used.

       2             0       Local digital loopback not in progress.

                    1        Local digital loopback in progress.

       3             0       Modem not in remote digital loopback.

                    1        Remote digital loopback in progress.

       4             0       Remote digital loopback not requested.

                    1        Remote digital loopback requested.

       5             0       Remote digital loopback w/ self-test not in
                             progress.
                    1
                             Remote digital loopback w/ self-test in
                             progress.

       6             0       Local analog loopback w/ self-test not in
                             progress.
                    1
                             Local analog loopback w/ self-test in
                             progress.

                              TEST MODE - PTT

  Type:          Configuration

  Format:        AT [cmds] %TT [cmds]

  Example:       AT %TT &W<CR>

  Description:   Send PTT test signals for European line test.

                           V.23 SPLIT BAUD MODE

  Type:          Configuration

  Format:        AT [cmds] \Wn [cmds]

  Example:       AT \W1 <CR>

  Description:   Controls V.23 split baud mode.

    Command                              Function

      \W0        V.23 split baud mode disabled.

      \W2        V.23 split baud mode enabled.

                       WRITE TO LAST STATUS REGISTER

  Type:          Configuration

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

  Example:       AT S=6 <CR>

  Description:   Set value of last accessed S-register.

