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# VEN-TEL, INC.
VT24V42FAX
Modem Type Data (synchronous/asynchronous)/Fax
Maximum Data Rate 2400bps
Maximum Fax Rate 9600bps
Data Bus External
Fax Class Class I & II
Data Modulation Protocol Bell 103A/212A
ITU-T V.21, V.22, V.22bis, V.23
Fax Modulation Protocol Unidentified
Error MNP5, MNP10, V.42, V.42bis
Correction/Compression
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| Line out | CN1 | RS-232/422 | CN4 |
|-----------------+----------+--------------------+----------|
| Line in | CN2 | Power switch | SW1 |
|-----------------+----------+--------------------+----------|
| DC power | CN3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-----+-------+----------+-----------------------------------|
| HS | Red | On | Modem is operating at 2400bps |
|-----+-------+----------+-----------------------------------|
| HS | Red | Off | Modem is operating at less than |
| | | | 2400bps |
|-----+-------+----------+-----------------------------------|
| 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 | 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 |
|-----+-------+----------+-----------------------------------|
| TM | Red | Blinking | Test mode enabled |
|-----+-------+----------+-----------------------------------|
| TM | Red | Off | Test mode disabled |
+------------------------------------------------------------+
Proprietary Command Set
+------------------------------------------------------------+
| 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 » 1 | Command echo function disabled. |
| | | |
| | | Command echo function enabled. |
|----------+--------+----------------------------------------|
| 2 | » 0 1 | Result code sending disabled. |
| | | |
| | | Result code sending enabled. |
|----------+--------+----------------------------------------|
| 3 | 0 » 1 | Numeric format enabled. |
| | | |
| | | Verbose format enabled. |
|----------+--------+----------------------------------------|
| 4 | 0 | Not used. |
|----------+--------+----------------------------------------|
| 5 | 0 » 1 | Tone dialing mode enabled. |
| | | |
| | | Pulse dialing mode enabled. |
|----------+--------+----------------------------------------|
| 6 | » 0 1 | Result codes normal. |
| | | |
| | | Result codes disabled in answer mode. |
|----------+--------+----------------------------------------|
| 7 | 0 » 1 | Answer mode enabled. |
| | | |
| | | 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 1 | Restore profile 0 on power-up. |
| | | |
| | | Restore profile 1 on power-up. |
|----------+-------+-----------------------------------------|
| 2 | 0 | Not used. |
|----------+-------+-----------------------------------------|
| 4, 3 | » 00 | DTR signal ignored. |
| | 01 10 | |
| | 11 | Modem goes to command mode on low DTR. |
| | | |
| | | Modem disconnects on low DTR. |
| | | Auto-Answer is disabled. |
| | | |
| | | Modem is initialized on low DTR. |
|----------+-------+-----------------------------------------|
| 5 | » 0 1 | DCD signal forced high. |
| | | |
| | | DCD signal normal. |
|----------+-------+-----------------------------------------|
| 6 | » 0 1 | DSR signal forced high. |
| | | |
| | | DSR signal normal. |
|----------+-------+-----------------------------------------|
| 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: | 118 |
|----------------+-------------------------------------------|
| 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 1 | 39/61ms pulse ratio at 10pps (North |
| | | America) |
| | | |
| | | 33/67ms pulse ratio at 10pps (Europe) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | 0 | Remote digital loopback response |
| | | disabled. |
| | 1 | |
| | | Remote digital loopback response |
| | | enabled. |
|-----------+--------+---------------------------------------|
| 3, 2, 1 | 000 | Local speed detected at 300bps. |
| | 001 | |
| | 010 | Local speed detected at 600bps. |
| | 011 | |
| | 100 » | Local speed detected at 1200bps. |
| | 101 | |
| | | Local speed detected at 2400bps. |
| | | |
| | | Local speed detected at 4800bps. |
| | | |
| | | Local speed detected at 9600bps. |
|-----------+--------+---------------------------------------|
| 5, 4 | 00 | Even parity detected. |
| | | |
| | 01 | Odd parity detected. |
| | | |
| | 11 | No parity detected. |
|-----------+--------+---------------------------------------|
| 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=77<CR> |
|----------------+-------------------------------------------|
| Default: | 73 |
|----------------+-------------------------------------------|
| Range: | 0 - 255 |
|----------------+-------------------------------------------|
| Unit: | Bit-mapped |
|----------------+-------------------------------------------|
| Description: | Controls communications mode, line type, |
| | 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 |
| | | follows connect speed. |
| | 001 | |
| | | Asynchronous command mode and |
| | 010 | synchronous connect mode. |
| | | |
| | 011 | Asynchronous command mode - modem |
| | | autodials first number in directory on |
| | 100 | high DTR, then synchronous connect |
| | | mode. |
| | 101 | |
| | | Asynchronous command mode on low DTR, |
| | 110 | synchronous connect mode on high DTR. |
| | | |
| | | Hayes AutoSync™ mode - serial port |
| | | locked at 9600bps. |
| | | |
| | | Error-correcting mode. |
| | | |
| | | Asynchronous mode, serial port speed |
| | | locked. |
|-----------+-------+----------------------------------------|
| 2 | » 0 1 | Select dial-up line. |
| | | |
| | | Select leased line. |
|-----------+-------+----------------------------------------|
| 5, 4 | 00 | Modem generates clock |
| | | |
| | 01 | Modem generates clock from the receive |
| | | carrier signal. |
| | 10 | |
| | | DTE generates clock |
|-----------+-------+----------------------------------------|
| 6 | » 0 1 | Select CCITT protocols. |
| | | |
| | | Select Bell protocols. |
|-----------+-------+----------------------------------------|
| 7 | 0 | Not used. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S41=n [cmds] |
|--------------+---------------------------------------------|
| Example: | AT S41=1<CR> |
|--------------+---------------------------------------------|
| Description: | Selects data compression. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| S41=0 | Data compression disabled. |
|--------------+---------------------------------------------|
| » S41=1 | Data compression enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT #Ln |
|--------------+---------------------------------------------|
| Example: | AT #L2 -K1 <CR> |
|--------------+---------------------------------------------|
| Description: | Selects active compression protocols. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| #L0 | Compression disabled. |
|--------------+---------------------------------------------|
| #L1 | MNP compression only enabled. |
|--------------+---------------------------------------------|
| #L2 | V.42bis compression only enabled. |
|--------------+---------------------------------------------|
| » #L3 | MNP and V.42bis compression enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Gn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT \G1 &K3<CR> |
|--------------+---------------------------------------------|
| Description: | Selects flow control. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| » \G0 | Flow control disabled. |
|--------------+---------------------------------------------|
| \G1 | Flow control enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Tn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT\T20<CR> |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-42 |
|--------------+---------------------------------------------|
| Unit: | 1 minute |
|--------------+---------------------------------------------|
| Description: | Sets the length of time that the modem does |
| | not receive information before it |
| | disconnects. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 1 | Remote digital loopback with local |
| | | 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. |
|----------+-------+-----------------------------------------|
| 7 | 0 | Not used. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+