
ZOOM TELEPHONICS, INC.

VFX 14.4V

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

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

[Image]

                                CONNECTIONS

         Purpose             Location          Purpose           Location

  Line out                     CN1       DC power                  CN4

  Line in                      CN2       Power switch              SW1

  RS-232/422                   CN3

                             DIAGNOSTIC LED(S)

     LED         Color        Status                 Condition

     MSG          Red           On              Stored faxes exist

     MSG          Red           Off               No faxes stored

     FAX          Red           On        Modem is connected in FAX mode

     FAX          Red           Off        Modem is not connected in FAX
                                                       mode

    14.4          Red           On          Modem connected at 14.4Kbps

    14.4          Red           Off       Modem not connected at 14.4Kbps

    V.32          Red           On            Modem is in V.32 mode.

    V.32          Red           Off         Modem is not in V.32 mode.

    V.42          Red           On            Modem is in V.42 mode.

    V.42          Red           Off         Modem is not in V.42 mode.

     DC           Red           On           Error correction enabled

     DC           Red           Off          Error correction disabled

     EC           Red           On           Error correction enabled

     EC           Red           Off          Error correction disabled

     FC           Red           On             Flow control enabled

     FC           Red           Off            Flow control disabled

     AA           Red           On              Auto-answer enabled

     AA           Red           Off            Auto-answer disabled

     AA           Red        Blinking            Phone is ringing

     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

     RX           Red           On            Modem is receiving data

     RX           Red           Off         Modem is not receiving data

     TX           Red           On          Modem is transmitting data

     TX           Red           Off       Modem is not transmitting data

     TR           Red           On              DTR signal is high

     TR           Red           Off              DTR signal is low

     MR           Red           On                  Power is on

     MR           Red           Off                Power is off

                         Proprietary AT Command Set

                               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        Fallback/fall forward enabled.

      %E3        Fallback/fall forward and fast hang-up enabled.

                                COMPRESSION

  Type:          Configuration

  Format:        AT %Cn

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

  Description:   Selects data compression.

    Command                              Function

      %C0        Data compression disabled.

      %C1        MNP5 enabled.

      %C2        V.42bis enabled.

   %C3          MNP5 and V.42bis enabled.

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Example:       AT \B3 &W<CR>

  Default:       3

  Range:         1-9

  Unit:          .1 second

  Description:   Sends break to modem.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] \Kn [cmds]

  Example:       AT \K1 <CR>

  Description:   Configures action of break signal.

    Command                              Function

      \K0        Flow control disabled.

   \K3          RTS/CTS flow control enabled.

      \K4        XON/XOFF flow control 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        Error correction mode enabled.

   \N3          MNP mode with fallback to normal mode enabled.

      \N4        LAPM mode only enabled.

      \N5        MNP mode enabled.

                         CONNECTION FAILURE CODES

  Format                AT [cmds] S86? [cmds]

  Example:              ATS86? <CR>

  Default:              Read-only

  Range:                0, 4 - 14

  Unit:                 None

  Stored:               N/A

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

        Value                               Meaning

          0             No failure - 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.

                        ERROR CORRECTION REJECTION

  Format                AT [cmds] S36=n [cmds]

  Example:              ATS36=0<CR>

  Default:              Unidentified

  Range:                0 - 7

  Unit:                 Bit-mapped

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

       Command                              Function

          0            Modem disconnects

          3            Modem attempts normal connection.

          4            Modem attempts MNP connection.

          7            Modem attempts MNP connection. If it fails, modem
                       attempts normal connection.

                         FLASH DIAL MODIFIER TIME

  Format                AT [cmds] S29=n [cmds]

  Example:              ATS29=0<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 DISPLAY

  Format         AT [cmds] S39? [cmds]

  Example:       ATS39?<CR>

  Default:       Read-only

  Range:         0, 3 - 6

  Unit:          None

  Stored:        N/A

  Description:   Contains the current flow control.

     Value                               Meaning

       0        Flow control is disabled.

   3           RTS/CTS flow control is enabled.

       4        XON/XOFF flow control is enabled.

       5        AFT XON/XOFF flow control is enabled.

       6        RTS/CTS and XON/XOFF flow control enabled.

                       FLOW CONTROL CHARACTER - XOFF

  Type:          Register

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

  Example:       ATS33=20<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=20<CR>

  Default:       17

  Range:         0-255

  Unit:          ASCII

  Description:   Sets the character used to represent XON.

                     LEASED LINE RECEIVE LEVEL DISPLAY

  Type:          Immediate

  Format:        AT [cmds] %L [cmds] l

  Example:       AT %L &W<CR>

  Description:   Displays signal level for reception when in leased-line
                 mode.

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:          Configuration

  Format:        AT [cmds] \An [cmds]

  Example:       AT \A3 %C1<CR>

  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]

  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.

                           NEGOTIATE LINE SPEED

  Type:          Configuration

  Format:        AT [cmds] %Q [cmds]

  Example:       AT %Q &W<CR>

  Description:   Displays signal quality.

                                SLEEP TIMER

  Format                  AT [cmds] S24=n [cmds]

  Example:                ATS24=40<CR>

  Default:                0

  Range:                  0 - 255

  Unit:                   1 second

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

