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 [Image] 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 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 disabled. 1 Result code sending enabled. 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 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 Restore profile 0 on power-up. 1 Restore profile 1 on power-up. 2 0 Not used. 4, 3 » 00 DTR signal ignored. 01 Modem goes to command mode on low DTR. 10 Modem disconnects on low DTR. Auto-Answer is disabled. 11 Modem is initialized on low DTR. 5 » 0 DCD signal forced high. 1 DCD signal normal. 6 » 0 DSR signal forced high. 1 DSR signal normal. 7 » 0 Long Space Disconnect function disabled. 1 Long Space Disconnect function enabled. BIT-MAPPED REGISTER S22 Format AT [cmds] S22=n [cmds] Example: ATS22=114 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 Lowest volume setting. 01 Low volume setting. » 10 Medium volume setting 11 Highest volume setting. 3, 2 00 Speaker disabled. » 01 Speaker enabled until carrier signal detected 10 Speaker enabled. 11 Speaker enabled following dialing, then disabled after carrier signal detected. 6, 5 ,4 000 Busy and dialtone detection disabled, result codes 0-4 enabled. 100 Busy and dialtone detection disabled, 101 result codes 0-5, 10 enabled. 110 Busy tone detection disabled, dialtone detection enabled, result codes 0-6, 10 » 111 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 39/61ms pulse ratio at 10pps (North America) 1 33/67ms pulse ratio at 10pps (Europe) BIT-MAPPED REGISTER S23 Format AT [cmds] S23=n [cmds] Example: ATS23=114 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 Local speed detected at 600bps. 010 Local speed detected at 1200bps. 011 Local speed detected at 2400bps. 100 Local speed detected at 4800bps. » 101 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 550Hz guard tone enabled. 10 1800Hz guard tone enabled. BIT-MAPPED REGISTER S27 Format AT [cmds] S27=n [cmds] Example: ATS27=77 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 synchronous 010 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, synchronous connect mode on high DTR. 110 Hayes AutoSync™ mode - serial port locked at 9600bps. Error-correcting mode. Asynchronous mode, serial port speed locked. 2 » 0 Select dial-up line. 1 Select leased line. 5, 4 00 Modem generates clock 01 Modem generates clock from the receive carrier signal. 10 DTE generates clock 6 » 0 Select CCITT protocols. 1 Select Bell protocols. 7 0 Not used. COMPRESSION Type: Register Format: AT [cmds] S41=n [cmds] Example: AT S41=1 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 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 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 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 Default: 0 Range: 0 - 255 Unit: Bit-mapped Description: Enables loopback tests. Note: Bit 3 is read-only. Bit Value Function 0 » 0 Local analog loopback test disabled. 1 Local analog loopback test enabled. 1 0 Not used. 2 » 0 Local digital loopback test disabled. 1 Local digital loopback test enabled. 3 » 0 Modem is not performing remote digital loopback test. 1 Modem is performing remote digital loopback test. 4 » 0 Remote digital loopback test disabled. 1 Remote digital loopback test enabled. 5 » 0 Remote digital loopback with local self-test disabled. 1 Remote digital loopback with local self-test enabled. 6 » 0 Local analog loopback with local self-test disabled. 1 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 Description: Selects MNP10 data compression. Command Function -K0 MNP10 disabled. » -K1 MNP10 enabled.