POSITIVE CORPORATION PC MODEM 2400S Card Type Modem(asynchronous) Chip Set Unidentified Maximum Data Rate 2400bps Data Bus 8 bit ISA Data Modulation Bell 103A/212A Protocol ITU-T V.21, V.22, V.22bis [Image] CONNECTIONS Function Label Function Label Line in CN1 Line out CN2 SERIAL PORT ADDRESS Setting J2 J3 COM1 (3F8h) Pins 2 & 3 closed Pins 2 & 3 closed COM2 (2F8h) Pins 2 & 3 closed Pins 1 & 2 closed COM3 (3E8h) Pins 1 & 2 closed Pins 2 & 3 closed COM4 (2E8h) Pins 1 & 2 closed Pins 1 & 2 closed INTERRUPT Setting J1 2 Pins 1 & 2 closed 3 Pins 1 & 3 closed 4 Pins 1 & 4 closed 5 Pins 1 & 5 closed Proprietary AT Command Set BIT-MAPPED REGISTER S14 Format AT [cmds] S14=n [cmds] Default: 170 Range: 0-174 Unit: Bit-mapped. Description: Controls echo, result codes, result code display, dial mode, and answer/originate mode Bit Value Function 0 0 Not used 1 0 Command echo disabled 1 Command echo enabled 2 0 Result codes enabled 1 Result codes disabled 3 0 Display result codes in numeric format 1 Display result codes in verbose format 4 0 Not used 5 0 Tone dial enabled 1 Pulse dial enabled 6 0 Not used 7 0 Answer mode enabled 1 Originate mode enabled BIT-MAPPED REGISTER S21 Format AT [cmds] S21=n [cmds] Default: 16 Range: 0 - 184 Unit: Bit-mapped. Description: Selects low DTR action, DCD signal, and the Long Space Disconnect function. Bit Value Function 0 0 Not used. 1 0 Not used. 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 forced high. 1 DCD normal. 6 0 Not used. 7 0 Long Space Disconnect function disabled. 1 Long Space Disconnect function enabled. BIT-MAPPED REGISTER S22 Format AT [cmds] S22=n [cmds] Default: 117 Range: 0-127 Unit: Bit-mapped Description: Controls speaker volume and controls, and limits results codes Bit Value Function 1, 0 01 On volume 10 Medium level volume 11 High level volume 3, 2 00 Speaker off 01 Speaker off until carrier detect 10 Speaker always on 11 Speaker on during handshake 6, 5, 4 000 Basic result codes only enabled 100 Basic and connection speed result codes enabled 101 Basic and connection speed result codes and dial tone detection enabled 110 All result codes except dial tone detection 111 enabled All result codes enabled 7 00 Make/break ratio 39%/61% 01 Make/break ratio 33%/67% BIT-MAPPED REGISTER S23 Format AT [cmds] S23=n [cmds] Default: 7 Range: 0-247 Unit: Bit-mapped Description: Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone Bit Value Function 0 0 Remote digital loopback disabled 1 Remote digital loopback enabled 2, 1 00 Sets serial port speed to 0-300bps 01 Not used 10 Sets serial port speed to 1200bps 11 Sets serial port speed to 2400bps 3 0 Not used 5,4 00 Parity even 01 Space 10 Parity odd 11 No Parity 7, 6 00 Guard tone disabled 01 Guard tone 550Hz enabled 10 Guard tone 1800Hz enabled PROTOCOL Format AT [cmds] S27=n [cmds] Default: 32 Range: 0 - 32 Unit: Bit-mapped Description: Selects operating protocol Bit Value Function 0 0 Not used 1 0 Not used 2 0 Not used 3 0 Not used 4 0 Not used 5 0 Not used 6 0 CCITT V.22bis/V.22 enabled 1 Bell 212 enabled TEST MODES Format AT [cmds] S16=n [cmds] Default: 0 Range: 0-125 Unit: Bit-mapped Description: Controls loopback tests, analog, digital, remote digital, and self tests. Bit Value Function 0 0 Local analog loopback disabled 1 Local analog loopback enabled 1 0 Not used. 2 0 Local digital loopback disabled 1 Local digital loopback enabled 3 0 Modem not in remote digital loopback. 1 Remote digital loopback in progress. 4 0 Remote digital loopback disabled 1 Remote digital loopback enabled 5 0 Remote digital loopback w/ self-test disabled 1 Remote digital loopback w/ self-test enabled 6 0 Local analog loopback w/ self-test disabled 1 Local analog loopback w/ self-test enabled