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# 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 Bell 103A/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.23, V.32,
V.32bis
Fax Modulation ITU-T V.17, V.21CH2, V.27ter, V.29
Protocol
Error MNP5, V.42, V.42bis
Correction/Compression
IMG IMG 1
+------------------------------------------------------------+
| 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 modem’s 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. |
+------------------------------------------------------------+