VEN-TEL, INC. PCM144FAX 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 Protocol Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.32, V.32bis Fax Modulation Protocol ITU-T V.17, V.21CH2, V.27ter, V.29 Error Correction/Compression MNP5, MNP10 V.42, V.42bis [Image] 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 On 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 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 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 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 Modem goes to command mode on low DTR. 010 Modem disconnects on low DTR. Auto-Answer is disabled. 011 Modem is initialized on low DTR. 100 Modem dials default number on low DTR. 6, 5 » 00 DCD signal forced high. 01 DCD signal normal. 10 DCD signal forced high except during disconnect. 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 Not used. 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 N/A Reserved for internal use. 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. 110 Local speed detected at 19200bps. 111 Local speed detected at 384 00bps. 5, 4 » 00 Even parity. 10 Odd parity. 11 No parity. 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=201 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 follows connect speed. 001 Asynchronous off-line command mode and » 101 synchronous connect mode. 110 Error-correcting mode. Asynchronous mode, serial port speed locked. 2 0 Not used. 4 0 Not used. 5 0 Not used. 6 » 0 Select CCITT protocols. 1 Select Bell protocols. 7 » 0 DSR forced high. 1 DSR normal. BIT-MAPPED REGISTER S39 Format AT [cmds] S39=n [cmds] Example: ATS39=201 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 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 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 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 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. 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. -K2 MNP10 enabled on originate mode only. MNP10 FALL-BACK Type: Configuration Format: AT [cmds] -Qn [cmds] Example: AT *H0 -Q1 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 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 Description: Controls automatic transmit power level adjustment during MNP 10 link negotiation. Command Function » )M0 Power level adjustment disabled. )M1 Power level adjustment enabled.