ZOOM TELEPHONICS, INC.

VFD X

Modem Type                  Data (synchronous/asynchronous)/Fax/Voice
Maximum Data Rate           2400bps
Maximum Fax Rate            9600bps
Data Bus                    External
Fax Class                   Class I & II
Data Modulation Protocol    Unidentified
Fax Modulation Protocol     Unidentified
Error                       MNP5, V.42, V.42bis
Correction/Compression

[Image]

                                CONNECTIONS

         Purpose             Location          Purpose         Location

  Line out                      CN1        DC power               CN5

  Line in                       CN2        Speaker                CN6

  Digital control               CN3        Power switch           SW1
  (Proprietary

  RS-232/422                    CN4

                             DIAGNOSTIC LED(S)

    LED         Color         Status                 Condition

     VM          Red        On/Blinking    Unread stored messages exist

     VM          Red            Off       No unread stored messages exist

     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         Blinking         Modem is receiving data

     RD          Red            Off         Modem is not receiving data

     TD          Red         Blinking       Modem is transmitting data

     TD          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.

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Example:       AT \B3 &W<CR>

  Range:         1-9

  Default        3

  Unit:          .1 second

  Description:   Sends break to modem.

                                COMPRESSION

  Type:          Configuration

  Format:        AT %Cn

  Example:       AT I2 %C1 &S0<CR>

  Description:   Selects data compression.

  Command                                Function

  %C0            Data compression disabled.

  %C1            MNP5 enabled.

  %C2            V.42bis enabled.

  » %C3          MNP5 and V.42bis enabled.

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] \Nn [cmds]

  Example:       AT \N1 DT555-1212<CR>

  Description:   Sets connect mode.

    Command                              Function

  \N1            Direct mode.

  \N0            Normal mode.

  \N2            Reliable mode.

  » \N3          Auto-reliable mode.

  \N4            V.42 reliable mode.

  \N5            MNP error correction mode.

                               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.

                             LINE SIGNAL LEVEL

  Type:          Configuration

  Format:        AT [cmds] %L [cmds]

  Example:       AT %L &W<CR>

  Unit:          -dBm

  Description:   Returns received line signal level.

                             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.

                    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.

                           REPORT SIGNAL QUALITY

  Type:          Configuration

  Format:        AT [cmds] %Q [cmds]

  Example:       AT %Q &W<CR>

  Description:   Reports signal quality.

                            REPORT MODEM STATUS

  Type:          Immediate

  Format:        AT [cmds] \S [cmds]

  Example:       AT \S &W<CR>

  Description:   Displays current modem configuration.