3COM CORPORATION COURIER 2400E/PS Card Type Modem (Asynchronous) Chip Set U.S. Robotics Maximum Data Rate 2400bps Data Bus Unidentified Data Modulation Protocol Unidentified 54152 Proprietary AT Command Set ABORT Type: Immediate Format: Any key Description: Aborts answering/originating a call; modem hangs up. ANSWER Type: Immediate Format: AT [cmds] A Description: Enables answer mode, the modem goes off-hook; pressing any key will abort. ANSWER SEQUENCE Type: Configuration Format: AT [cmds] Bn [cmds] Description: Selects the answer sequence the modem will use Command Function B0 ITU-T answer sequence enabled B1 Bell answer sequence enabled ATTENTION Type: Immediate Format: AT [cmds] Description: Tells the modem that a command follows or use alone to test OK result code BIT-MAPPED REGISTER S13 Format AT [cmds] S13=n [cmds] Default: 0 Range: 0-222 Unit: Bit-mapped Description: Controls auto-answer, result code pause, DTR dialing, reset dialing, MNP3 and hardware reset. Bit Value Function 0 0 Not used 1 0 Auto-answer mode disabled 1 Auto-answer mode on originate enabled 2 0 Result code pause enabled 1 Result code pause disabled 3 0 DTR dialing disabled 1 DTR dialing enabled 4 0 Reset dialing disabled 1 Reset dialing enabled, dials number at position 0 in NVRAM. 5 0 Not used 6 0 MNP 3 enabled 1 MNP 3 disabled 7 0 Hardware reset disabled 1 Hardware reset enabled BIT-MAPPED REGISTER S15 Format AT [cmds] S15=n [cmds] Default: 0 Range: 0-81 Unit: Bit-mapped Description: Controls escape sequence, MNP4, and MNP compliance. Bit Value Function 0 0 Normal operation 1 Hang up on receiving +++ 1 - 3 000 Not used 4 0 MNP 4 enabled 1 MNP 4 disabled 5 0 Not used 6 0 MNP normal 1 MNP adjusted for non compliant modems BREAK TYPE Type: Configuration Format: AT [cmds] &Yn [cmds] Description: Configures action of break signal Command Function &Y0 Empty buffer only &Y1 Empties buffer and break is sent immediately &Y2 Do not empty buffer and break is sent immediately &Y3 Do not empty buffer or send break CARRIER DETECT (CD) Type: Configuration Format: AT [cmds] &Cn [cmds] Description: Controls the CD signal Command Function &C0 Modem does not respond to CD signal &C1 CD signal normal CARRIER FAILURE CODES Type: Register Format: AT [cmds] S20=n [cmds] Description: Reports codes which correspond to the possible causes of NO CARRIER Value Meaning 0 Ant key abort 1 DTR dropped 2 Escape sequence 3 Loss of carrier 4 Inactivity time-out 5 ARQ connection not established, hang-up. 6 ARQ retry time-out 7 Receive link disconnect COMPRESSION Type: Configuration Format: AT [cmds] &Kn [cmds] Description: Selects data compression Command Function &K0 Data compression disabled &K1 Auto enabled/disable data compression &K2 Data compression enabled CONNECTION FAILURE CODES Type: Register Format: AT [cmds] S17=n [cmds] Default: 0 Description: Reports codes which correspond to the possible causes of a connection failure CONNECTION SPEED Type: Configuration Format: AT [cmds] &Nn [cmds] Description: Sets connection speed, modem will hang up if it cannot connect. Command Function &N0 Normal link &N1 300bps &N2 1200bps &N3 2400bps DATA TERMINAL READY (DTR) Type: Configuration Format: AT [cmds] &Dn [cmds] Description: Selects modem response to DTR Command Function &D0 Modem does not respond to DTR &D1 Modem goes to command mode after DTR toggles &D2 Modem is initialized after DTR goes off DIAL Type: Immediate Format: AT [cmds] D<#> [cmds] Example: ATDT 443-3388,,,1111; 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. Command Function P Pulse dialing enabled T Tone dialing enabled , Dialing paused for 2 seconds to a maximum amount of time specified in S8 register ; Modem returned to command state after dialing. Can only be placed at the end of the dial command. " Dials letters that follow, ATDT"GOMICRO ! Flash function initiated W Dialing resumed following dial tone detection @ Wait for quiet answer, then proceeds to execute the rest of the dial string. R Answer mode enabled; originate mode disabled following handshake initiation. DIAL - STORED NUMBER Type: Immediate Format: AT [cmds] DSn [cmds] Description: Dial stored number from memory location n ECHO Type: Configuration Format: AT [cmds] En [cmds] Description: Controls echo function; display keyboard commands when enabled. Command Function E0 Echo function disabled E1 Echo function enabled ECHO - ON-LINE Type: Configuration Format: AT [cmds] Fn [cmds] Description: Selects whether commands sent while in data mode are echoed Command Function F0 Local echo enabled F1 Local echo disabled ERROR CORRECTION MODE (ARQ) Type: Configuration Format: AT [cmds] &Mn [cmds] Description: Selects active error correction protocols Command Function &M0 Normal mode only enabled &M4 Normal/ARQ mode enabled &M5 ARQ mode only enabled ESCAPE SEQUENCE Type: Immediate Format: +++AT [cmds] Description: Initiates the escape sequence and returns the modem to the on-line command state if it receives three escape characters set in S2 within the time allotted by S12. Note: Do not precede this command with AT. EXTENDED RESULT CODES Type: Configuration Format: AT [cmds] &An [cmds] Description: Selects extended result codes Command Function &A0 ARQ result codes disabled &A1 ARQ result codes enabled FACTORY DEFAULT PROFILE Type: Configuration Format: AT [cmds] &F [cmds] Description: Load default profile in NVRAM FLOW CONTROL PASSTHROUGH Type: Configuration Format: AT [cmds] &In [cmds] Description: Allows modem to act on, then transmit XON/XOFF characters. Command Function &I0 Flow control disabled &I1 XON/XOFF passthrough enabled &I2 XON/XOFF passthrough disabled FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] &Hn [cmds] Description: Sets type of flow control used by modem Command Function &H0 Flow control disabled &H1 CTS/RTS flow control enabled &H2 XON/XOFF flow control enabled &H3 CTS/RTS and XON/XOFF flow control enabled FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] &Rn [cmds] Description: Controls receive data hardware flow control and RTS signals Command Function &R1 Modem ignores RTS &R2 Received data to DTE when RTS is on GUARD TONE Type: Configuration Format: AT [cmds] &Gn [cmds] Description: Commands the modem to transmit a guard tone Note: Used primarily for international data transmission Command Function &G0 Guard tone disabled &G1 550Hz guard tone enabled &G2 1800Hz guard tone enabled HOOK CONTROL Type: Immediate Format: AT [cmds] Hn [cmds] Description: Selects whether the modem is on-hook or off-hook Command Function H0 Modem commanded to go on-hook (hang-up) H1 Modem commanded to go off-hook (pick-up) INACTIVITY TIMER Type: Register Format: AT [cmds] S19=n [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; S19=0 will disable. JACK TYPE Type: Configuration Format: AT [cmds] &Jn [cmds] Description: Selects jack type Command Jack Type &J0 RJ-11C &J1 RJ-12, RJ-13 LIST AMPERSAND COMMANDS Type: Immediate Format: AT [cmds] &$ [cmds] Description: Displays ampersand (&) commands LIST DIAL COMMANDS Type: Immediate Format: AT [cmds] D$ [cmds] Description: Displays dial commands LIST S-REGISTERS Type: Immediate Format: AT [cmds] S$ [cmds] Description: Displays the S-registers ON-LINE Type: Immediate Format: AT [cmds] O [cmds] Description: Return to on-line command (data transmission) mode Note: The O command must be placed at the end of the command string. PULSE DIALING Type: Configuration Format: AT [cmds] P [cmds] Description: Enables pulse dialing Note: This command can be duplicated with the P modifier in the D (Dial) command. PULSE DIALING RATIO Type: Configuration Format: AT [cmds] &Pn [cmds] Description: Selects pulse dial make/break ratio Command Function &P0 39/61ms at 10pps (North America) &P1 33/67ms at 10pps (Europe) REPEAT COMMAND STRING Type: Configuration Format: AT [cmds] > [cmds] Description: Causes modem to repeat command string until a keyboard key is pressed REPEAT PREVIOUS COMMAND Type: Immediate Format: A/ Description: Repeats previous command, mainly used for redial Note: Do not precede this command with AT, or follow it with . REPORT INFORMATION Type: Immediate Format: AT [cmds] In [cmds] Description: Displays information requested Command Function I0 Reports product code I1 Reports ROM checksum I2 Reports RAM checksum I3 Reports call duration I4 Reports current command settings I5 Reports NVRAM settings RESULT CODES Type: Configuration Format: AT [cmds] Qn [cmds] Description: Enables modem to send result codes to the DTE Command Function Q0 Result code sending enabled Q1 Result code sending disabled RESULT CODE FORMAT Type: Configuration Format: AT [cmds] Vn [cmds] Description: Selects word or numeric format for information-text and result codes Command Function V0 Numeric format enabled V1 Verbose (word) format enabled SELECT CALL PROGRESS RESULT CODES Type: Configuration Format: AT [cmds] Xn [cmds] Description: Enables selection of tone detection and associated result code format options Command Function X0 Busy and dial tone detection disabled; result codes 0-4 enabled. X1 Busy and dial tone detection disabled; result codes 0-5 and 10 enabled X2 Busy tone detection disabled, dial tone detection enabled; result codes 0-6 and 10 enabled; also adaptive dialing, and fast dialing enabled. X3 Busy tone detection enabled, dial tone detection disabled; result codes 0-5, 7-10 enabled; also adaptive dialing, wait for second dial tone, and wait for answer enabled. X4 Busy and dial tone detection enabled; result codes 0-10 enabled; also adaptive dialing, wait for second dial tone, wait for answer, and fast dialing enabled. X5 Busy tone detection enabled, dial tone detection disabled; result codes 0-5, 7-12 enabled; also adaptive dialing, wait for second dial tone, and wait for answer enabled. X6 Busy and dial tone detection enabled; result codes 0-10 enabled; also adaptive dialing, wait for second dial tone, wait for answer, and fast dialing enabled. Note: Valid numeric result codes; 0-8, and 10-12. SERIAL PORT SPEED Type: Configuration Format AT [cmds] &Bn [cmds] Description: Sets the maximum allowable data exchange rate from the local computer and modem. Command Function &B0 Speed of last AT command &B1 300bps &B2 600bps &B3 1200bps &B4 2400bps &B5 4800bps &B6 9600bps &B7 19.2Kbps SOFT RESET Type: Immediate Format: AT [cmds] Z [cmds] Description: Resets modem to profiles saved in non-volatile RAM SPEAKER MODE Type: Configuration Format: AT [cmds] Mn [cmds] Description: Selects various speaker options Command Function M0 Speaker disabled M1 Speaker enabled until carrier signal detected M2 Speaker enabled M3 Speaker enabled following dialing, then disabled after carrier signal detected. SPEAKER VOLUME Type: Configuration Format: AT [cmds] Ln [cmds] Description: Controls speaker volume Command Function L0 Low volume setting L1 Low volume setting L2 Medium volume setting L3 Highest volume setting STATUS-REGISTER Type: Configuration Format: Read: AT [cmds] Sn? [cmds] Write: AT [cmds] Sn=x [cmds] Description: Writes to or reads from a specified register STORE ACTIVE PROFILE Type: Configuration Format: AT [cmds] &W [cmds] Description: Writes current values to non-volatile RAM templates STORE TELEPHONE NUMBER Type: Configuration Format: AT [cmds] &Zn=(phone # & modifiers) Description: Writes selected telephone numbers into the non-volatile memory at location n Note: The characters described in the D command are valid for use in the &Z command. Command Function &Zn? Displays phone number from non-volatile memory at location n TEST MODES Type: Configuration Format: AT [cmds] S16=n [cmds] Description: Controls tests. Analog loopback, dial, and self tests (test pattern). Command Function S16=0 Testing disabled S16=1 Local analog loopback enabled S16=2 Dial test enabled S16=4 Test pattern enabled S16=5 Local analog loopback and test pattern enabled TONE DIALING Type: Configuration Format: AT [cmds] T [cmds] Description: Enables tone dialing mode Note: This command can be duplicated with the T modifier in the D (Dial) command.