PRACTICAL PERIPHERALS, INC. PM2400 Card Type Modem (asynchronous) Chip Set Unidentified Maximum Data Rate 2400bps Data Bus 8-bit ISA Data Modulation Protocol Bell 103/212A ITU-T V.22 V2037 SERIAL PORT ADDRESS Setting IRQ SW1/A SW1/B COM1 (3F8h) 4 On On COM2 (2F8h) 3 Off Off COM3 (3E8h) 4 On Off COM4 (2E8h) 3 Off On MISCELLANEOUS TECHNICAL NOTES Diagram not available 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 and 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: 0 Range: 0-185 Unit: Bit-mapped Description: Selects jack type, CTS/DCD/DSR signals, low DTR action, and the long space disconnect function Bit Value Function 0 0 Selects RJ-11, RJ-41S, or RJ45S jack 1 Selects RJ-12 or RJ-13 jack 2, 1 00 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: 118 Range: 0-255 Unit: Bit-mapped Description: Controls speaker volume and controls, limits results codes, and pulse dial make/break ratio. Bit Value Function 1, 0 00 Volume off 01 Low level volume 10 Medium level volume 11 High level volume 3, 2 00 Speaker off 01 Speaker off on carrier 10 Speaker always on 11 Speaker on during handshake 6 - 4 000 Basic result codes only enabled 100 Basic and connection speed result codes enabled 101 Basic and connection speed result codes and dialtone detection enabled 110 All result codes except dialtone detection 111 enabled All result codes enabled 7 0 39/61ms at 10pps (North America) 1 33/67ms at 10pps (Europe) 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 denied 1 Remote digital loopback allowed 2, 1 00 Sets serial port speed to 0-300bps 01 Sets serial port speed to 600bps 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 parity 10 Parity odd 11 Mark or no parity 7, 6 00 Guard tone disabled 01 Guard tone 550Hz enabled 10 Guard tone 1800Hz enabled 11 Not used BIT-MAPPED REGISTER S27 Format AT [cmds] S27=n [cmds] Default: 64 Range: 0-64 Unit: Bit-mapped Description: Selects ITU-T/Bell modes Bit Value Function 5 - 0 000000 Not used 6 0 ITU/T mode 1 Bell mode DIAL Type: Immediate Format: AT [cmds] D<#> [cmds] Description: Dials telephone number according to any modifiers included in the string Note: Any combination of modifiers can be used to produce the desired dial functions in sequence. Modifier Function L Re-dial last number P Pulse dialing enabled R Answer mode enabled, originate mode disabled following handshake initiation S=n Dial stored telephone number n T Tone dialing enabled W Dialing resumed following dial tone detection , Dialing paused for amount of time specified in S8 register ! Modem commanded to go off-hook for specified time before returning on-hook @ Wait for quiet answer ; Modem returned to command state after dialing REPORT INFORMATION Type: Immediate Format: AT [cmds] In [cmds] Description: Displays information requested Command Function I0 Reports product code, e.i. 24x, the x represents the revision level I1 Reports ROM checksum I2 Reports ‘OK’ I3 Reports product number