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# VEN-TEL, INC.
PCM144FAX II
Modem Type Data (synchronous/asynchronous)/Fax
Maximum Data Rate 14.4Kbps
Maximum Fax Rate 14.4Kbps
Data Bus 8-bit ISA
Fax Class Class I & II
Data Modulation Bell 103A/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.32,
V.32bis
Fax Modulation ITU-T V.17, V.21CH2, V.27ter, V.29
Protocol
Error MNP5, MNP10, V.42, V.42bis
Correction/Compression
IMG IMG 1
+------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|------------------------------------------------------------|
| Address | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|--------------+-----------+-----------+----------+----------|
| 3F8h (COM1:) | On | Off | Off | On |
|--------------+-----------+-----------+----------+----------|
| 2F8h (COM2:) | Off | Off | On | Off |
|--------------+-----------+-----------+----------+----------|
| 3E8h (COM3:) | On | On | Off | On |
|--------------+-----------+-----------+----------+----------|
| 2E8h (COM4:) | Off | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | SW1/1 | SW1/2 | J1/A | J1/B | J1/C | J1/D |
|-------+--------+--------+--------+--------+--------+-------|
| 3 | On | Off | Open | Open | Open | Open |
|-------+--------+--------+--------+--------+--------+-------|
| 4 | Off | On | Open | Open | Open | Open |
|-------+--------+--------+--------+--------+--------+-------|
| 5 | Off | Off | Closed | Open | Open | Open |
|-------+--------+--------+--------+--------+--------+-------|
| 6 | Off | Off | Open | Closed | Open | Open |
|-------+--------+--------+--------+--------+--------+-------|
| 7 | Off | Off | Open | Open | Closed | Open |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| ABORT DIALING |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S64=n [cmds] |
|--------------+---------------------------------------------|
| Example: | AT S64=1<CR> |
|--------------+---------------------------------------------|
| Description: | Selects whether dialing and handshaking |
| | sequences can be interrupted. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » S64=0 | Dialing and handshaking are aborted on |
| | receipt of a character from the serial |
| | port. |
|--------------+---------------------------------------------|
| S64=1 | Characters received from the serial port |
| | during dialing and handshaking are ignored. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 enabled. |
| | | |
| | 1 | Result code sending disabled. |
|----------+--------+----------------------------------------|
| 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 | Profile 0 enabled. |
| | | |
| | 1 | Profile 1 enabled. |
|-----------+-------+----------------------------------------|
| 4, 3, 2 | » 000 | DTR signal ignored. |
| | 001 | |
| | 010 | Modem goes to command mode on low DTR. |
| | 011 | |
| | 100 | Modem disconnects on low DTR. |
| | | Auto-Answer is disabled. |
| | | |
| | | Modem is initialized on low DTR. |
| | | |
| | | Modem dials default number on low DTR. |
|-----------+-------+----------------------------------------|
| 6, 5 | » 00 | DCD signal forced high. |
| | 01 10 | |
| | | DCD signal normal. |
| | | |
| | | DCD signal forced high except during |
| | | disconnect. |
|-----------+-------+----------------------------------------|
| 7 | » 0 1 | Long Space Disconnect function |
| | | disabled. |
| | | |
| | | Long Space Disconnect function |
| | | enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S22 |
|------------------------------------------------------------|
| Format | AT [cmds] S22=n [cmds] |
|----------------+-------------------------------------------|
| Example: | ATS22=114<CR> |
|----------------+-------------------------------------------|
| Default: | 0 |
|----------------+-------------------------------------------|
| 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 01 | Lowest volume setting. |
| | » 10 | |
| | 11 | Low volume setting. |
| | | |
| | | Medium volume setting |
| | | |
| | | Highest volume setting. |
|-----------+--------+---------------------------------------|
| 3, 2 | 00 » | Speaker disabled. |
| | 01 10 | |
| | 11 | Speaker enabled until carrier signal |
| | | detected |
| | | |
| | | Speaker enabled. |
| | | |
| | | Speaker enabled following dialing, |
| | | then disabled after carrier signal |
| | | detected. |
|-----------+--------+---------------------------------------|
| 6, 5 ,4 | 000 | Busy and dialtone detection disabled, |
| | 100 | result codes 0-4 enabled. |
| | 101 | |
| | 110 » | Busy and dialtone detection disabled, |
| | 111 | result codes 0-5, 10 enabled. |
| | | |
| | | Busy tone detection disabled, |
| | | dialtone detection enabled, result |
| | | codes 0-6, 10 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 | Not used |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | N/A | Reserved for internal use. |
|-----------+--------+---------------------------------------|
| 3, 2, 1 | 000 | Local speed detected at 300bps. |
| | 001 | |
| | 010 | Local speed detected at 600bps. |
| | 011 | |
| | 100 » | Local speed detected at 1200bps. |
| | 101 | |
| | 110 | Local speed detected at 2400bps. |
| | 111 | |
| | | Local speed detected at 4800bps. |
| | | |
| | | Local speed detected at 9600bps. |
| | | |
| | | Local speed detected at 19200bps. |
| | | |
| | | Local speed detected at 38400bps. |
|-----------+--------+---------------------------------------|
| 5, 4 | » 00 | Even parity. |
| | 10 11 | |
| | | Odd parity. |
| | | |
| | | No parity. |
|-----------+--------+---------------------------------------|
| 7, 6 | » 00 | Guard tone disabled. |
| | 01 10 | |
| | | 550Hz guard tone enabled. |
| | | |
| | | 1800Hz guard tone enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S27 |
|------------------------------------------------------------|
| Format | AT [cmds] S27=n [cmds] |
|----------------+-------------------------------------------|
| Example: | ATS27=201<CR> |
|----------------+-------------------------------------------|
| Default: | 73 |
|----------------+-------------------------------------------|
| Range: | 0 - 255 |
|----------------+-------------------------------------------|
| Unit: | Bit-mapped |
|----------------+-------------------------------------------|
| Description: | Controls communications mode, DSR signal, |
| | 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 |
| | 001 » | follows connect speed. |
| | 101 | |
| | 110 | Asynchronous off-line command mode and |
| | | synchronous connect mode. |
| | | |
| | | Error-correcting mode. |
| | | |
| | | Asynchronous mode, serial port speed |
| | | locked. |
|-----------+-------+----------------------------------------|
| 2 | 0 | Not used. |
|-----------+-------+----------------------------------------|
| 4 | 0 | Not used. |
|-----------+-------+----------------------------------------|
| 5 | 0 | Not used. |
|-----------+-------+----------------------------------------|
| 6 | » 0 1 | Select CCITT protocols. |
| | | |
| | | Select Bell protocols. |
|-----------+-------+----------------------------------------|
| 7 | » 0 1 | DSR forced high. |
| | | |
| | | DSR normal. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S39 |
|------------------------------------------------------------|
| Format | AT [cmds] S39=n [cmds] |
|-----------------+------------------------------------------|
| Example: | ATS39=201<CR> |
|-----------------+------------------------------------------|
| Range: | 0 - 31 |
|-----------------+------------------------------------------|
| Unit: | Bit-mapped |
|-----------------+------------------------------------------|
| Description: | Controls flow control and line type. |
|------------------------------------------------------------|
| Bit | Value | Function |
|------------+-------+---------------------------------------|
| 2, 1, 0 | 000 | Flow control disabled. |
| | | |
| | 011 | Hardware flow control enabled. |
| | | |
| | 100 | Normal software flow control enabled. |
| | | |
| | 101 | Transparent software flow control |
| | | enabled. |
| | 110 | |
| | | Unidirectional software flow control |
| | | enabled. |
|------------+-------+---------------------------------------|
| 4, 3 | 00 | Switched line. |
| | | |
| | 01 | Leased line originate mode. |
| | | |
| | 10 | Leased line answer mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S41=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS41=2<CR> |
|--------------+---------------------------------------------|
| Description: | Selects data compression and error |
| | correction. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| S41=0 | Data compression disabled. |
|--------------+---------------------------------------------|
| S41=1 | Data compression enabled. |
|--------------+---------------------------------------------|
| S41=2 | Error correction enabled. |
|--------------+---------------------------------------------|
| S41=3 | Data compression and error correction |
| | enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT %Cn |
|--------------+---------------------------------------------|
| Example: | AT %C0 *Y1<CR> |
|--------------+---------------------------------------------|
| Description: | Selects data compression. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %C0 | Data compression disabled. |
|--------------+---------------------------------------------|
| %C1 | Data compression enabled. |
|--------------+---------------------------------------------|
| %C2 | Data correction enabled. |
|--------------+---------------------------------------------|
| » %C3 | Data compression and correction enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 1 | Local analog loopback test disabled. |
| | | |
| | | Local analog loopback test enabled. |
|----------+-------+-----------------------------------------|
| 1 | 0 | Not used. |
|----------+-------+-----------------------------------------|
| 2 | » 0 1 | Local digital loopback test disabled. |
| | | |
| | | Local digital loopback test enabled. |
|----------+-------+-----------------------------------------|
| 3 | » 0 1 | Modem is not performing remote digital |
| | | loopback test. |
| | | |
| | | Modem is performing remote digital |
| | | loopback test. |
|----------+-------+-----------------------------------------|
| 4 | » 0 1 | Remote digital loopback test disabled. |
| | | |
| | | Remote digital loopback test enabled. |
|----------+-------+-----------------------------------------|
| 5 | » 0 | Remote digital loopback with local |
| | 1 | self-test disabled. |
| | | |
| | | Remote digital loopback with local |
| | | self-test enabled. |
|----------+-------+-----------------------------------------|
| 6 | » 0 1 | Local analog loopback with local |
| | | self-test disabled. |
| | | |
| | | Local analog loopback with local |
| | | self-test enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
|--------------+---------------------------------------------|
| -K2 | MNP10 enabled on originate mode only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 FALL-BACK |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -Qn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT *H0 -Q1 <CR> |
|--------------+---------------------------------------------|
| Description: | Allows MNP10 to fall back to speeds slower |
| | than 4800bps. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| -Q0 | MNP10 at 2400 and 1200bps disabled. |
|--------------+---------------------------------------------|
| » -Q1 | MNP10 at 2400 and 1200bps enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 LINK NEGOTIATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *Hn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT *H0 -Q1 <CR> |
|--------------+---------------------------------------------|
| Description: | Sets the speed at which MNP10 link |
| | negotiation will occur. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » *H0 | Link will be negotiated at highest possible |
| | speed. |
|--------------+---------------------------------------------|
| *H1 | Link will be negotiated at 1200bps. |
|--------------+---------------------------------------------|
| *H2 | Link will be negotiated at 4800bps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 POWER LEVEL ADJUST |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] )Mn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT )M1 %C1<CR> |
|--------------+---------------------------------------------|
| Description: | Controls automatic transmit power level |
| | adjustment during MNP 10 link negotiation. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » )M0 | Power level adjustment disabled. |
|--------------+---------------------------------------------|
| )M1 | Power level adjustment enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ROAD KEY CUSTOMIZE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *A^x^x^x^x [cmds] |
|--------------+---------------------------------------------|
| Example: | AT *A^M^H^I^I &W<CR> |
|--------------+---------------------------------------------|
| Description: | Sets the key for Remote Options Access and |
| | Downloading (^ indicates ctrl key |
| | depressed). The default is ^R^O^A^D. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ROAD KEY ENABLE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *Bn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT *B0 *U O<CR> |
|--------------+---------------------------------------------|
| Description: | Enables Remote Options Access and |
| | Downloading. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » *B0 | R.O.A.D. disabled. |
|--------------+---------------------------------------------|
| *B1 | R.O.A.D. enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ROAD KEY INITIATE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *U [cmds] |
|--------------+---------------------------------------------|
| Example: | AT *B0 *U O<CR> |
|--------------+---------------------------------------------|
| Description: | Commands the modem to transmit stored |
| | Remote Access Options and Downloading key. |
| | The modem must have already connected. |
+------------------------------------------------------------+