
ZOOM TELEPHONICS, INC.

28.8K EXTERNAL V.34

Card Type                       Modem, Fax
Chip Set                        Unidentified
I/O Options                     Line in (RJ-11), line out (RJ-11), DTE
                                (25-pin serial connector)
Maximum Modem Rate              28.8Kbps
Maximum Fax Rate                14.4Kbps
Data Modulation Protocol        Bell 103A/212A, ITU-T V.21, V.22,
                                V.22bis,V.23, V.32, V.32bis, V.34
Fax Modulation Protocol         V.17, V.21, CH2, V.27ter, V.29, V.33
Error Correction/Compression    MNP5, MNP10, V.42, V.42bis
Fax Class                       Class I & II
Data Bus                        External

[Image]

                                CONNECTIONS

        Function           Label             Function             Label

  Power jack                     CN1       Line in                 CN3

  DTE connector (25-pin          CN2       Line out                CN4
  serial connector)

                             DIAGNOSTIC LED(S)

   LED         Color          Status                 Condition

    OH      Unidentified        On               Modem is off-hook

    OH      Unidentified       Off               Modem is on-hook

    AA      Unidentified        On              Auto-answer enabled

    AA      Unidentified       Off             Auto-answer disabled

    AA      Unidentified     Blinking            Phone is ringing

    RD      Unidentified        On            Modem is receiving data

    RD      Unidentified       Off          Modem is not receiving data

    TD      Unidentified        On          Modem is transmitting data

    TD      Unidentified       Off        Modem is not transmitting data

    TR      Unidentified        On              DTR signal is high

    TR      Unidentified       Off               DTR signal is low

    CD      Unidentified        On            Carrier signal detected

    CD      Unidentified       Off          Carrier signal not detected

    CS      Unidentified        On              CTS signal is high

    CS      Unidentified       Off               CTS signal is low

    EC      Unidentified        On           Error correction enabled

    EC      Unidentified       Off           Error correction disabled

    DC      Unidentified        On           Data compression enabled

    DC      Unidentified       Off           Data compression disabled

   14.4     Unidentified        On          Modem connected at 14.4Kbps

   14.4     Unidentified       Off        Modem not connected at 14.4Kbps

   V.34     Unidentified        On          Modem not connected in V.34
                                                       mode

   V.34     Unidentified       Off         Modem connected in V.34 mode

   FAX      Unidentified        On        Fax connection has been made to
                                                 remote fax modem

   FAX      Unidentified       Off          Fax connection has not been
                                             made to remote fax modem

   MSG      Unidentified        On               Faxes are waiting

   MSG      Unidentified       Off             Faxes are not waiting

    MR      Unidentified        On                  Power is on

    MR      Unidentified       Off                 Power is off

    MR      Unidentified     Blinking       Modem is in self-test mode

                           SUPPORTED COMMAND SET

                             Basic AT Commands

  AT, A/

  A, B, E, H, M, O, P, T, V, W, Z

  &C, &K, &M, &T, &V, &W, &Y, &Z

                           Extended AT Commands

  %C, %L, %Q

  \A, \B, \G, \L, \N

  )M

  *H

  -K, -Q

  :E

  +MS

                                S Registers

  S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S14, S16, S18,
  S21, S22, S23, S24

  S25, S26, S27, S28, S29, S31, S32, S33, S38, S40, S41



  Note: See MHI Help File for full command documentation.

                         PROPRIETARY AT COMMAND SET

                            AUTO-MODE DETECTION

  Type:          Configuration

  Format:        AT [cmds] Nn [cmds]

  Description:   Enables/disbles automatic detection.

    Command                              Function

       N0        Auto-mode detection disabled

       N1        Auto-mode detection enabled

                            COMMUNICATIONS MODE

  Type:          Configuration

  Format:        AT [cmds] &Mn [cmds]

  Description:   Selects communications mode

    Command                                Mode

      &M0        Asynchronous mode

                            COMMUNICATIONS MODE

  Type:           Configuration

  Format:         AT [cmds] &Qn [cmds]

  Description:    Selects communications mode options

    Command                                Mode

      &Q0         Asynchronous mode, serial port speed follows connect
                  speed.

      &Q5         Error correction mode

      &Q6         Buffered asynchronous mode

                           DATA SET READY (DSR)

  Type:          Configuration

  Format:        AT [cmds] &Sn [cmds]

  Description:   Selects DSR options

    Command                              Function

      &S0        DSR forced high

      &S1        DSR high only while modem is handshaking or connected

                         DATA TERMINAL READY (DTR)

  Type:                  Configuration

  Format:                AT [cmds] &Dn [cmds]

  Description:           Selects modem response to DTR

        Command                              Function

          &D0            Modem does not respond to DTR

          &D1            Modem goes to command mode after DTR goes is off

          &D2            Modem goes to command mode and disconnects
                         (hangs up) after DTR goes off; Auto-Answer is
                         disabled.

          &D3            Modem is initialized after DTR goes off

                                   DIAL

  Type:                  Immediate

  Format:                AT [cmds] D<#> [cmds]

  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

           DL            Re-dial last number

           DP            Pulse dialing enabled

          DS=n           Dial stored telephone number n (0-3)

           DT            Tone dialing enabled

           DW            Dialing resumed following dial tone detection

           D,            Dialing paused for amount of time specified in
                         S8 register

           D!            Flash function initiated. Modem commanded to go
                         off-hook for specified time before returning
                         on-hook.

           D@            Wait for Quite 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.

           D^            Calling tone enabled

           D;            Modem returned to idle state after dialing. The
                         semicolon can only be placed at the end of the
                         dial command.

                                GUARD TONE

  Type:           Configuration

  Format:         AT [cmds] &Gn [cmds]

  Description:    Commands the modem to transmit a guard tone in
                  V.22/V.22bis

            Note: Used primarily for international data transmission

    Command                              Function

      &G0         Guard tone disabled

      &G1         Guard tone disabled

      &G2         1800Hz guard tone enabled

                            PULSE DIALING RATIO

  Type:          Configuration

  Format:        AT [cmds] &Pn [cmds]

  Description:   Selects pulse dial make/break ratio

    Command                              Function

      &P0        39/61ms at 10pps (North America)

      &P1        Not used

      &P2        Not used

      &P3        Not used

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Description:   Displays information requested

    Command                              Function

       I0        Reports product code

       I1        Reports ROM checksum

       I2        Tests and reports ROM checksum

       I3        Reports firmware revision code

       I4        Reports identifier string

       I5        Reports country code

       I6        Reports data pump chipset revision

                     SELECT CALL PROGRESS RESULT CODES

  Type:                 Configuration

  Format:               AT [cmds] Xn [cmds]

  Description:          Enables selection of tone detection and
                        associated result code format options

       Command                              Function

          X0            Sends OK, CONNECT, RING, NO CARRIER, ERROR, and
                        NO ANSWER

          X1            Sends OK, CONNECT, RING, NO CARRIER, ERROR, NO
                        ANSWER, and

                        CONNECT speed

          X2            Sends OK, CONNECT, RING, NO CARRIER, ERROR, NO
                        ANSWER, CONNECT speed and NO DIALTONE

          X3            Sends OK, CONNECT, RING, NO CARRIER, ERROR, NO
                        ANSWER, CONNECT speed and BUSY

          X4            Sends all responses

                              SPEAKER VOLUME

  Type:          Configuration

  Format:        AT [cmds] Ln [cmds]

  Description:   Controls speaker volume

    Command                              Function

       L0        Low volume setting

       L1        Low volume setting

       L2        Medium volume setting

       L3        Highest volume setting

                        TRANSMIT DATA FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] &Kn [cmds]

  Description:   Enables TD flow control options

    Command                              Function

      &K0        Flow control disabled

      &K3        RTS/CTS flow control enabled

      &K4        XON/XOFF flow control enabled

                          EXTENDED AT COMMAND SET

                 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-fallback/fall-forward enabled

      %E3        Auto-retrain and fast hang up enabled

                       TRANSMISSION LEVEL - CELLULAR

  Type:             Configuration

  Format:           AT [cmds] @Mn [cmds]

  Range:            11-31

  Unit:             -1 dBm

  Description:      Sets the signal level for transmission over cellular
                    communications

     Command                              Function

       @M0          -26 dBm

       @M1          -30 dBm

     @M2-@M10       -10 dBm

       @M11         -11 dBm

       @M12         -12 dBm

       @M30         -30 dBm

                            S(status)-REGISTERS

                               BREAK OPTIONS

  Type:                Register

  Format               AT [cmds] S82=n [cmds]

  Description:         Sets the method for break transmission during
                       error-control and ASB connections.

       Command                              Function

        S82=3          Expedited signaling, immediately send timed break

        S82=7          Destructive signaling, buffers cleared,
                       immediately send timed break

       S82=128         In-sequence signaling, timed break sent in
                       sequence with transmitted data

                         CONNECTION FAILURE CODES

  Type:               Register

  Format              AT [cmds] S86? [cmds]

  Description:        Reports codes which correspond to the possible
                      causes of a connection failure

       Value                                Meaning

         0            Normal hang up

         4            Carrier signal lost

         5            No error-control detected for remote modem during
                      feature negotiation

         6            Remote modem failed to respond to feature
                      negotiation

         7            Local modem is asynchronous-only, remote modem is
                      synchronous-only

         8            No common framing technique found

         9            No common protocol found

         10           Remote modem sent erroneous feature negotiation
                      message

         11           Remote modem failed to send synchronous information

         12           No failure - remote modem disconnected normally

         13           Remote modem failed to respond after 10
                      re-transmissions same message

         14           Violation of negotiated protocol caused failure

                              DCE LINE SPEED

  Type:                Register

  Format               AT [cmds] S37=n [cmds]

  Description:         Sets the maximum allowable data exchange rate
                       attempted during handshake process.

       Command                              Function

        S37=0          Speed of last connection

        S37=1          300bps

        S37=2          300bps

        S37=3          300bps

        S37=4          Reserved

        S37=5          1200bps

        S37=6          2400bps

        S37=7          75bps send, 1200bps receive

        S37=8          4800bps

        S37=9          9600bps

       S37=10          12.0Kbps

       S37=11          14.4Kbps

       S37=12          7200bps

                       ERROR CORRECTION/COMPRESSION

  Type:           Register

  Format:         AT [cmds] S46=n [cmds]

  Description:    Selects active error correction and compression
                  protocols

    Command                              Function

    S46=136       LAP-M only, no compression

    S46=138       LAP-M with V.42bis data compression

                       ERROR CORRECTION NEGOTIATION

  Type:                 Register

  Format                AT [cmds] S36=n [cmds]

  Description:          Selects the action of the modem if it fails to
                        connect with the error-correction protocol set in
                        &Q.

        Command                             Function

         S36=0          Hang up

         S36=3          Attempt a buffered connection

         S36=4          Attempt a connection at MNP2-4; if that fails,
                        hang up.

         S36=7          Attempt a connection at MNP2-4; if that fails,
                        attempt a buffered connection.

                           EXTENDED RESULT CODES

  Type:            Register

  Format           AT [cmds] S95=n [cmds]

  Unit:            Bit-mapped

  Description:     Reports result codes

   Bit    Value                           Function

    0          0   CONNECT result code reports DTE speed.

              1    CONNECT result code reports line speed instead DTE
                   speed.

    1          0   Verbose CONNECT result codes display DTE or line speed
                   only.
              1
                   Adds "/ARQ" to all verbose CONNECT result codes except
                   "NONE."

    2          0   CARRIER result codes disabled.

              1    CARRIER result codes enabled.

    3          0   PROTOCOL result codes disabled.

              1    PROTOCOL result codes enabled.

    4         0    Reserved

    5          0   COMPRESSION result codes disabled.

              1    COMPRESSION result codes enabled.

                        FEATURE NEGOTIATION OPTIONS

  Type:           Register

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

  Description:    Selects active error correction and compression
                  protocols

    Command                              Function

     S48=0        Detection negotiation disabled, XID negotiation
                  disabled

     S48=7        Detection negotiation and XID negotiation enabled

    S48=128       Fall-back to options set in S36

                               FLOW CONTROL

  Type:          Register

  Format         AT [cmds] S39? [cmds]

  Description:   Displays the current flow control

     Value                               Meaning

       0         Flow control disabled

       3         RTS/CTS flow control enabled

       4         XON/XOFF flow control enabled

       5         Transparent XON/XOFF flow control enabled

       6         Hardware and software flow control enabled



