
VEN-TEL, INC.

VT24V42FAX

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            2400bps
Maximum Fax Rate             9600bps
Data Bus                     External
Fax Class                    Class I & II
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.21, V.22, V.22bis, V.23
Fax Modulation Protocol      Unidentified
Error Correction/Compression MNP5, MNP10, V.42, V.42bis

[Image]

                                CONNECTIONS

        Purpose           Location            Purpose            Location

  Line out                  CN1       RS-232/422                   CN4

  Line in                   CN2       Power switch                 SW1

  DC power                  CN3

                             DIAGNOSTIC LED(S)

    LED         Color         Status                 Condition

     HS          Red            On         Modem is operating at 2400bps

     HS          Red            Off          Modem is operating at less
                                                    than 2400bps

     AA          Red            On              Auto answer enabled

     AA          Red            Off             Auto answer disabled

     CD          Red            On            Carrier signal detected

     CD          Red            Off         Carrier signal not detected

     OH          Red            On               Modem is off-hook

     OH          Red            Off               Modem is on-hook

     RD          Red            On            Modem is receiving data

     RD          Red            Off         Modem is not receiving data

     SD          Red            On           Modem is transmitting data

     SD          Red            Off        Modem is not transmitting data

     TR          Red            On               DTR signal is high

     TR          Red            Off              DTR signal is low

     TM          Red         Blinking            Test mode enabled

     TM          Red            Off              Test mode disabled

                          Proprietary Command Set

                          BIT-MAPPED REGISTER S14

  Format                  AT [cmds] S14=n [cmds]

  Example:                ATS14=139<CR>

  Default:                171

  Range:                  0 - 255

  Unit:                   Bit-mapped

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

      Bit        Value                         Function

       0         1           Not used.

       1         0           Command echo function disabled.

                  1         Command echo function enabled.

       2          0         Result code sending disabled.

                 1           Result code sending enabled.

       3         0           Numeric format enabled.

                  1         Verbose format enabled.

       4         0           Not used.

       5         0           Tone dialing mode enabled.

                  1         Pulse dialing mode enabled.

       6          0         Result codes normal.

                 1           Result codes disabled in answer mode.

       7         0           Answer mode enabled.

                  1         Originate mode enabled.

                          BIT-MAPPED REGISTER S21

  Format                  AT [cmds] S21=n [cmds]

  Example:                ATS21=1<CR>

  Default:                0

  Range:                  0 - 255

  Unit:                   Bit-mapped

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

      Bit        Value                         Function

       0         0            Not used.

       1          0          Restore profile 0 on power-up.

                 1            Restore profile 1 on power-up.

       2         0            Not used.

      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 signal forced high.

                 1            DCD signal normal.

       6          0          DSR signal forced high.

                 1            DSR signal 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:                  ATS22=114<CR>

  Default:                  118

  Range:                    0 - 255

  Unit:                     Bit-mapped

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

       Bit          Value                       Function

       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,
                                result codes 0-4 enabled.
                    100
                                Busy and dialtone detection disabled,
                    101         result codes 0-5, 10 enabled.

                    110         Busy tone detection disabled, dialtone
                                detection enabled, result codes 0-6, 10
                     111       enabled.

                                Busy tone detection enabled, dialtone
                                detection disabled, result codes 0-5, 7,
                                10 enabled.

                                Busy and dialtone detection enabled,
                                result codes 0-7, 10 enabled.

        7            0         39/61ms pulse ratio at 10pps (North
                                America)
                    1
                                33/67ms pulse ratio at 10pps (Europe)

                          BIT-MAPPED REGISTER S23

  Format                    AT [cmds] S23=n [cmds]

  Example:                  ATS23=114<CR>

  Default:                  0, read-only (see note)

  Range:                    0 - 255

  Unit:                     Bit-mapped

  Description:              Controls guard tones. Also indicates detected
                            serial port speed and parity. Also provides
                            storage for remote digital loopback tests.

  Note:                     All bits except bits 6 and 7 are read-only.

        Bit          Value                       Function

         0               0       Remote digital loopback response
                                 disabled.
                         1
                                 Remote digital loopback response
                                 enabled.

      3, 2, 1        000         Local speed detected at 300bps.

                     001         Local speed detected at 600bps.

                     010         Local speed detected at 1200bps.

                     011         Local speed detected at 2400bps.

                     100         Local speed detected at 4800bps.

                      101       Local speed detected at 9600bps.

       5, 4              00      Even parity detected.

                         01      Odd parity detected.

                        11       No parity detected.

       7, 6           00        Guard tone disabled.

                     01          550Hz guard tone enabled.

                     10          1800Hz guard tone enabled.

                          BIT-MAPPED REGISTER S27

  Format                    AT [cmds] S27=n [cmds]

  Example:                  ATS27=77<CR>

  Default:                  73

  Range:                    0 - 255

  Unit:                     Bit-mapped

  Description:              Controls communications mode, line type, and
                            protocol type.

  Note:                     Be aware that bits 2 and 3 are out of order.

       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 - modem
                                autodials first number in directory on
                       100      high DTR, then synchronous connect mode.

                       101      Asynchronous command mode on low DTR,
                                synchronous connect mode on high DTR.
                      110
                                Hayes AutoSync&trade; mode - serial port
                                locked at 9600bps.

                                Error-correcting mode.

                                Asynchronous mode, serial port speed
                                locked.

        2            0         Select dial-up line.

                    1           Select leased line.

       5, 4            00       Modem generates clock

                       01       Modem generates clock from the receive
                                carrier signal.
                       10
                                DTE generates clock

        6            0         Select CCITT protocols.

                    1           Select Bell protocols.

        7           0           Not used.

                                COMPRESSION

  Type:          Register

  Format:        AT [cmds] S41=n [cmds]

  Example:       AT S41=1<CR>

  Description:   Selects data compression.

  Command                                Function

  S41=0          Data compression disabled.

   S41=1        Data compression enabled.

                             COMPRESSION MODE

  Type:          Configuration

  Format:        AT #Ln

  Example:       AT #L2 -K1 <CR>

  Description:   Selects active compression protocols.

  Command                                Function

  #L0            Compression disabled.

  #L1            MNP compression only enabled.

  #L2            V.42bis compression only enabled.

   #L3          MNP and V.42bis compression enabled.

                               FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] \Gn [cmds]

  Example:       AT \G1 &K3<CR>

  Description:   Selects flow control.

  Command                                Function

   \G0          Flow control disabled.

  \G1            Flow control enabled.

                             INACTIVITY TIMER

  Type:             Configuration

  Format:           AT [cmds] \Tn [cmds]

  Example:          AT\T20<CR>

  Default:          0

  Range:            0-42

  Unit:             1 minute

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

                              LOOPBACK TESTS

  Format              AT [cmds] S16=n [cmds]

  Example:            ATS16=32<CR>

  Default:            0

  Range:              0 - 255

  Unit:               Bit-mapped

  Description:        Enables loopback tests.

  Note:               Bit 3 is read-only.

     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.

      7        0         Not used.

                             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.

