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 Correction/Compression | MNP5, MNP10, V.42, V.42bis |
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 01 10 11 | DTR signal ignored. 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» 10 11 | Lowest volume setting. Low volume setting. Medium volume setting Highest volume setting. | |
3, 2 | 00» 01 10 11 | Speaker disabled. Speaker enabled until carrier signal detected Speaker enabled. Speaker enabled following dialing, then disabled after carrier signal detected. | |
6, 5 ,4 | 000 100 101 110» 111 | Busy and dialtone detection disabled, result codes 0-4 enabled. Busy and dialtone detection disabled, 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 1 | Remote digital loopback response disabled. Remote digital loopback response enabled. | |
3, 2, 1 | 000 001 010 011 100» 101 | Local speed detected at 300bps. Local speed detected at 600bps. Local speed detected at 1200bps. Local speed detected at 2400bps. Local speed detected at 4800bps. Local speed detected at 9600bps. | |
5, 4 | 00 01 11 | Even parity detected. Odd parity detected. No parity detected. | |
7, 6 | » 00 01 10 | Guard tone disabled. 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 | 000 001 010 011 100 101 110 | Asynchronous mode, serial port speed follows connect speed. Asynchronous command mode and synchronous connect mode. Asynchronous command mode - modem autodials first number in directory on high DTR, then synchronous connect mode. Asynchronous command mode on low DTR, 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 01 10 | Modem generates clock Modem generates clock from the receive carrier signal. 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. |