UNIDENTIFIED 2400U/BU MODEM 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.21, V.22, V.22bis Error Correction/Compression MNP5, V.42 [Image] CONNECTIONS Function Label Function Label Line in CN1 Line out CN2 SERIAL PORT ADDRESS Setting SW1/1 SW1/2 COM1 (3F8h) On On COM2 (2F8h) Off On COM3 (3E8h) On Off COM4 (2E8h) Off Off INTERRUPT Setting SW2/1 SW2/2 2 Off Off 3 On Off 4 Off On 5 Off Off Proprietary AT Command Set AUTO-RELIABLE FALLBACK CHARACTER Type: Configuration Format: AT [cmds] %An [cmds] Default: 0 Range: 0-127 Unit: ASCII Description: Sets the character used as the auto-reliable fallback character; %A0 will disable this function. AUTO-RELIABLE TIME BUFFER CONFIGURATION Type: Configuration Format: AT [cmds] \Cn [cmds] Description: Controls the handling of incoming data during auto-reliable time period Command Function \C0 Data is discarded \C1 Data is buffered \C2 Data is discarded; modem returns to normal mode on receiving auto-reliable fallback character. BIT-MAPPED REGISTER S14 Format AT [cmds] S14=n [cmds] Default: 42 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: 48 Range: 0-252 Unit: Bit-mapped Description: Selects jack type, CTS/DCD/DSR signals, low DTR action, and the long space disconnect function. Bit Value Function 1, 0 0 Not used 2 0 CTS follows RTS 1 CTS forced high 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 DSR forced high 1 DSR normal 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 make/break ratio. Bit Value Function 1, 0 00 Off volume 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, 5, 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 enabled 111 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: 6 Range: 0-183 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 allowed 1 Remote digital loopback denied 2, 1 00 Sets serial port speed to 0-300bps 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 Parity 7, 6 00 Guard tone disabled 01 Guard tone 550Hz enabled 10 Guard tone 1800Hz enabled BIT-MAPPED REGISTER S27 Format AT [cmds] S27=n [cmds] Default: 64 Range: 0-68 Unit: Bit-mapped Description: Selects line type, and ITU-T/Bell modes. Bit Value Function 1, 0 0 Not used 2 0 Switched line 1 Leased line 5 - 3 0 Not used 6 0 ITU/T mode 1 Bell mode BREAK SEND Type: Configuration Format: AT [cmds] \Bn [cmds] Default: 3 Range: 1-9 Unit: .1 second Description: Sends break to modem BREAK TYPE Type: Configuration Format: AT [cmds] \Kn [cmds] Description: Configures action of break signal Command Break from DTE Modem receives Break from DTE \B Reliable/Normal Direct mode mode \K0 Online command Break sent to Send break to mode enabled, remote modem remote modem send no break to and buffered immediately, remote modem cleared Online command mode enabled \K1 Break sent to Break sent to Send break to remote modem and remote modem remote modem buffered cleared and buffered immediately cleared \K2 Online command Send break to Send break to mode enabled, remote modem remote modem send no break to immediately immediately, remote modem Online command mode enabled \K3 Send break to Send break to Send break to remote modem remote modem remote modem immediately immediately immediately \K4 Online command Send break with Send break to mode enabled, transmitted remote modem send no break to data immediately, remote modem Online command mode enabled \K5 Send break with Send break with Send break to transmitted data transmitted remote modem data immediately BAUD RATE ADJUST Type: Configuration Format: AT [cmds] \Jn [cmds] Description: Allows baud rate to follow serial port speed Command Function \J0 Baud rate adjust disabled \J1 Baud rate adjust enabled COMPRESSION Type: Configuration Format: AT [cmds] %Cn [cmds] Description: Selects data compression Command Function %C0 Data compression disabled %C1 Data compression enabled CONFIGURATION PROFILES Type: Immediate Format: AT [cmds] \Sn [cmds] Description: Displays active configuration profiles and stored profile 0 and 1. CONNECT MODE Type: Configuration Format: AT [cmds] \Nn [cmds] Description: Controls the type of connection the modem will operate in Command Function \N0 Normal mode enabled \N1 Direct mode enabled \N2 MNP reliable mode enabled \N3 MNP auto-reliable mode enabled \N4 LAP-M reliable mode with detection enabled \N5 LAP-M auto-reliable mode with detection enabled \N6 LAP-M reliable mode without detection enabled \N7 LAP-M auto-reliable mode without detection enabled DISPLAY STORED NUMBERS Type: Immediate Format: AT [cmds] \F [cmds] Description: Displays all stored phone numbers ECHO DATA Type: Configuration Format: AT [cmds] \En [cmds] Description: Enables modem to echo received data Command Function \E0 Data echo disabled \E1 Data echo enabled EXTENDED RESULT CODES Type: Configuration Format: AT [cmds] \Vn [cmds] Description: Selects extended result codes Command Function \V0 Extended result codes disabled \V1 Extended result codes enabled EXTENDED RESULT CODES - MNP Type: Configuration Format: AT [cmds] -Mn [cmds] Description: Selects the display of MNP result codes with extended result codes Command Function -M0 Disable display of MNP connection service class -M1 Enable display of MNP connection service class while extended result codes are enabled FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] \Qn [cmds] Description: Sets type of flow control used by modem Command Function \Q0 Flow control disabled \Q1 XON/XOFF flow control enabled \Q2 CTS Unidirectional flow control enabled \Q3 Bidirectional CTS/RTS flow control enabled INACTIVITY TIMER Type: Configuration Format: AT [cmds] \Tn [cmds] Default: 0 Range: 0-90 Unit: 1 minute Description: Sets the length of time that the modem does not receive information before it disconnects. MAXIMUM BLOCK SIZE FOR TRANSMISSION Type: Configuration Format: AT [cmds] \An [cmds] Description: Sets the maximum transmittable block size Command Function \A0 MNP block size is 64 characters \A1 MNP block size is 128 characters \A2 MNP block size is 192 characters \A3 MNP block size is 256 characters PROTOCOL/SPEED Type: Configuration Format: AT [cmds] %Bn [cmds] Description: Selects the initial DCE speed Command Function %B0 Select 300bps speed %B1 Select 1200bps speed %B2 Select 2400bps speed 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 not in progress 1 Local analog loopback in progress 1 0 Not used 2 0 Local digital loopback not in progress 1 Local digital loopback in progress 3 0 Modem not in remote digital loopback 1 Remote digital loopback in progress 4 0 Remote digital loopback not in progress 1 Remote digital loopback in progress 5 0 Remote digital loopback w/ self-test not in progress 1 Remote digital loopback w/ self-test in progress 6 0 Local analog loopback w/ self-test not in progress 1 Local analog loopback w/ self-test in progress XON/XOFF PASS-THROUGH Type: Configuration Format: AT [cmds] \Xn [cmds] Description: Selects whether XON/XOFF signals are sent to remote modem Command Function \X0 XON/XOFF signals trapped by local modem \X1 XON/XOFF passed through local modem