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# ZOOM TELEPHONICS, INC.
VFX 28.8
Card Type Fax, Modem (asynchronous)
Chip Set Unidentified
Maximum Data Rate 28.8Kbps
Maximum Fax Rate 14.4Kbps
Data Bus External
Fax Class Unidentified
Data Modulation Protocol Unidentified
Fax Modulation Protocol Unidentified
Error Correction/Compression Unidentified
V2022
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line out | CN1 | DC power | CN4 |
|---------------------------+----------+--------------+------|
| Line in | CN2 | Power switch | SW1 |
|---------------------------+----------+--------------+------|
| RS-232/422 | CN3 | | |
+------------------------------------------------------------+
+-----------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|-----------------------------------|
| Note: Diagram not available. |
+-----------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|------+-------+----------+----------------------------------|
| MSG | Red | On | Used by software applications. |
| | | | Faxes are waiting |
|------+-------+----------+----------------------------------|
| MSG | Red | Off | Used by software applications. |
| | | | Faxes are not waiting |
|------+-------+----------+----------------------------------|
| FAX | Red | On | Modem is connected in FAX mode |
|------+-------+----------+----------------------------------|
| FAX | Red | Off | Modem is not connected in FAX |
| | | | mode |
|------+-------+----------+----------------------------------|
| 28.8 | Red | On | Modem connected at 28.8Kbps |
|------+-------+----------+----------------------------------|
| 28.8 | Red | Off | Modem not connected at 28.8Kbps |
|------+-------+----------+----------------------------------|
| VFC | Red | On | Modem connected using V.FC |
|------+-------+----------+----------------------------------|
| VFC | Red | Off | Modem not connected using V.FC |
|------+-------+----------+----------------------------------|
| 14.4 | Red | On | Modem connected at 14.4Kbps |
| | | | (V.FC, V.32bis, or FAX mode) |
|------+-------+----------+----------------------------------|
| 14.4 | Red | Off | Modem not connected at 14.4Kbps |
| | | | (V.FC, V.32bis, or FAX mode) |
|------+-------+----------+----------------------------------|
| DC | Red | On | Data compression (V.42bis or |
| | | | MNP5) enabled |
|------+-------+----------+----------------------------------|
| DC | Red | Off | Data compression (V.42bis or |
| | | | MNP5) disabled |
|------+-------+----------+----------------------------------|
| EC | Red | On | Error correction (V.42 or MNP4) |
| | | | enabled |
|------+-------+----------+----------------------------------|
| EC | Red | Off | Error correction (V.42 or MNP4) |
| | | | disabled |
|------+-------+----------+----------------------------------|
| FC | Red | On | Flow control enabled and data |
| | | | buffers not full |
|------+-------+----------+----------------------------------|
| FC | Red | Off | Flow control disabled or data |
| | | | buffers full |
|------+-------+----------+----------------------------------|
| 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 |
|------+-------+----------+----------------------------------|
| 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 |
|------+-------+----------+----------------------------------|
| MR | Red | On | Power is on |
|------+-------+----------+----------------------------------|
| MR | Red | Off | Power is off |
+------------------------------------------------------------+
Proprietary AT Command Set