3COM CORPORATION COURIER HST WITH ASL Modem Type Data (synchronous/asynchronous) Maximum Data Rate 14.4Kbps Data Bus External Data Modulation Protocol Bell 103A/212A ITU-T V.22, V.22bis, V.23 Error Correction/Compression MNP5, V.42, V.42bis [Image] CONNECTIONS Purpose Location Purpose Location Line out CN1 DC power CN4 Line in CN2 Volume R1 RS-232/422 CN3 Power switch SW2 MI/MIC POLARITY Setting J6 J8 » Normal Pins 1 & 2 closed Pins 1 & 2 closed Reversed Pins 2 & 3 closed Pins 2 & 3 closed TX/RX PIN ASSIGNMENT Setting SW3 Normal operation » Off Reverse TX/RX pin assignments On DTR SIGNAL Setting SW1/1 DTR forced high On » DTR normal Off RESULT CODES Setting SW1/2 » Verbose result codes enabled Off Numeric result codes enabled On RESULT CODES DISPLAY Setting SW1/3 » Display enabled On Display disabled Off ECHO COMMANDS DISPLAY Setting SW1/4 » Local echo enabled Off Local echo disabled On AUTO ANSWER Setting SW1/5 » Modem answers on first ring On Modem does not answer on first ring Off CARRIER DETECT Setting SW1/6 » CD normal Off CD forced high On RESULT CODES DISPLAY Setting SW1/7 » Display result codes in originate Off and answer modes Display result codes in Answer mode On AT COMMAND SET Setting SW1/8 » AT command set enabled On AT command set disabled Off ESCAPE CODE Setting SW1/9 » Off Disconnect, go to command mode and display NO CARRIER when escape character is received On Go to command mode and display OK result code when escape character is received USER PROFILE Setting SW1/10 » Off Use stored profile On Use factory default VOICE/DATA Setting SW4 Note: for switch functions see table for register S32. DIAGNOSTIC LED(S) LED Color Status Condition HS Red On Modem is operating at 4800bps or faster HS Red Off Modem is operating at slower than 4800bps AA Red On Auto-answer enabled AA Red Off Auto-answer disabled CD Red On Carrier signal detected CD Red Off Carrier signal not detected OH Red On Modem is off-hook OH Red Off Modem is on-hook RD Red Blinking Modem is receiving data RD Red Off Modem is not receiving data TD Red Blinking Modem is transmitting data TD Red Off Modem is not transmitting data TR Red On DTR signal is high TR Red Off DTR signal is low MR Red On Power is on MR Red Off Power is off MR Red Blinking Retraining/test mode RS Red On RTS signal is high RS Red Off RTS signal is low CS Red On CTS signal is high CS Red Off CTS signal is low EC Red On Error control enabled EC Red Off Error control disabled EC Red Blinking Modem is retransmitting data SYN Red On Synchronous mode SYN Red Off Asynchronous mode Proprietary AT Command Set BIT-MAPPED REGISTER S13 Format AT [cmds] S13=n [cmds] Example: ATS13=139 Default: 0 Range: 0 - 255 Unit: Bit-mapped Description: Controls DTR reset, DTR dialing, auto answer, result code delay, reset dialing, HST and MNP3. Bit Value Function 0 » 0 DTR normal. 1 Reset on low DTR. 1 » 0 Auto answer operation normal. 1 When ring detected, enter originate mode and listen for answer tone. 2 » 0 Pause 250 msec. before displaying result codes. 1 Display result codes immediately. 3 » 0 DTR dialing disabled. 1 DTR dialing enabled. 4 » 0 Reset dialing disabled. 1 Reset dialing enabled. 5 » 0 HST enabled. 1 HST disabled. 6 » 0 MNP 3 enabled. 1 MNP 3 disabled. BIT-MAPPED REGISTER S15 Format: AT [cmds] S15=n [cmds] Example: ATS15=139 Default: 0 Range: 0 - 127 Unit: Bit-mapped Description: Controls HST high frequency equalization, online fallback, back channel, non-error-correcting mode buffer, MNP4, and BS/DEL switch and MNP compliance Bit Value Function 0 » 0 HST high frequency equalization enabled. 1 HST high frequency equalization disabled. 1 » 0 Online fallback enabled. 1 Online fallback disabled. 2 » 0 450bps back channel enabled. 1 450bps back channel disabled. 3 » 0 Non-error-correcting mode transmit buffer set to 1.5KB. 1 Non-error-correcting mode transmit buffer set to 128 bytes. 4 » 0 MNP 4 enabled. 1 MNP 4 disabled. 5 » 0 Use backspace key for delete disabled. 1 Use backspace key for delete enabled. 6 » 0 MNP normal. 1 MNP adjusted for non compliant modems. BIT-MAPPED REGISTER S27 Format: AT [cmds] S27=n [cmds] Example: ATS27=139 Default: 0 Range: 0 - 191 Unit: Bit-mapped Description: Controls V.21, V.42 answer tone and handshake, and 9600 result codes. Bit Value Function 0 » 0 V.21 disabled. 1 V.21 enabled. 1 » 0 Not used. 2 » 0 Not used. 3 » 0 2100Hz answer tone enabled. 1 2100Hz answer tone disabled. 5, 4 » 00 V.42 detect, LAPM and MNP enabled. 01 V.42 detect and LAPM enabled. 10 MNP enabled. 11 LAPM enabled. 6 » 0 Not used. 7 » 0 Actual result codes displayed. 1 Force 9600 result codes. BREAK LENGTH Type: Register Format: AT [cmds] S21=n [cmds] Example: ATS21=20 Default: 10 Range: Unidentified Unit: 10 ms Description: Sets the length of error control mode breaks sent from DCE to DTE. BREAK TYPE Type: Configuration Format: AT [cmds] &Yn [cmds] Example: AT &Y0 Description: Configures action of break signal. Command Function &Y0 Break empties buffer. » &Y1 Break empties buffer and is sent immediately. &Y2 Break does not empty buffer and is sent immediately. COMPRESSION Type: Configuration Format: AT [cmds] &Kn [cmds] Example: AT &K1 Description: Controls data compression. Command Function &K0 Data compression disabled. &K1 Data compression disabled when serial port is locked. &K2 Data compression enabled. &K3 MNP 5 disabled. CONNECTION SPEED UPPER LIMIT Type: Configuration Format: AT [cmds] &Nn [cmds] Example: AT &N1 DT555-1212 Description: Sets required connection speed if &U is set to 0. Otherwise, sets fastest allowed connection speed. Command Function » &N0 Variable. &N1 300bps &N2 1200bps &N3 2400bps &N4 4800bps &N5 7200bps &N6 9600bps &N7 12Kbps &N8 14.4Kbps &N9 16.8Kbps &N10 19.2Kbps &N11 21.6Kbps &N12 24Kbps &N13 26.4Kbps &N14 28.8Kbps EXTENDED RESULT CODES Type: Configuration Format: AT [cmds] &An [cmds] Example: AT &A1 %C1 Description: Selects extended result codes. Command Function &A0 Extended result codes disabled. &A1 ARQ result codes enabled. » &A3 Error control and compression result codes enabled. FLOW CONTROL CHARACTER - XON Type: Register Format: AT [cmds] S22=n [cmds] Example: ATS22=20 Default: 17 Range: 11-127 Unit: ASCII Description: Sets the character used to represent XON. FLOW CONTROL CHARACTER - XOFF Type: Register Format: AT [cmds] S23=n [cmds] Example: ATS23=20 Default: 19 Range: 11-127 Unit: ASCII Description: Sets the character used to represent XOFF. FLOW CONTROL PASSTHROUGH Type: Configuration Format: AT [cmds] &In [cmds] Example: AT &I0 &W Description: Allows modem to act on, then transmit XON/XOFF characters. Command Function » &I0 Software flow control disabled. &I1 XON/XOFF passthrough enabled. &I2 XON/XOFF passthrough disabled. FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] &Hn [cmds] Example: AT &H0 A 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. HELP SCREENS Type: Immediate Format: AT $ Example: AT &$ Description: Shows command help screens for all commands beginning with the given prefix, or no prefix if none is given. Command Function $ Shows ATx help screen. &$ Shows AT&x help screen. D$ Shows ATDx help screen. S$ Shows S-register help screen. INACTIVITY TIMER Type: Register Format: AT [cmds] S19=n [cmds] Example: ATS19=20 Default: 0 Range: Unidentified Unit: 1 minute Description: Sets the length of time that the modem does not receive information before it disconnects. NETWORK ACCESS Type: Configuration Format: AT [cmds] %Rn [cmds] Example: AT %R1 &W Description: Used with USR network management system. Command Function » %R0 Network access disabled. %R1 Network access enabled. REPEAT COMMAND STRING Type: Configuration Format: AT [cmds] > [cmds] Example: AT *D1 > #E1 Description: Causes modem to repeat command string until a keyboard key is pressed. REPORT INFORMATION Type: Immediate Format: AT [cmds] In [cmds] Example: AT I1 O Description: Displays modem properties. Command Function I0 Reports product code. I1 Reports ROM checksum result. I2 Reports RAM checksum result. I3 Reports firmware version. I4 Reports current command settings. I5 Reports current NVRAM settings. I6 Reports current connection’s statistics. I7 Reports configuration. STATUS REGISTER BIT Type: Configuration Format: Read: AT [cmds] Sn.m=0 or 1 [cmds] Write: AT [cmds] Sn.m=? [cmds] Example: AT S40.4=1 S51.3? Description: Sets/clears or reads bit m of register n. TESTING Format AT [cmds] S16=n [cmds] Example: ATS16=32 Default: 0 Range: 0 - 15 Unit: Bit-mapped Description: Enables loopback tests. Note: Bit 3 is read-only. Bit Value Function 0 » 0 Analog loopback test disabled. 1 Analog loopback test enabled. 1 » 0 Dial test disabled. 1 Dial test enabled. 2 » 0 Test pattern disabled. 1 Test pattern enabled. 3 » 0 Remote digital loopback test disabled. 1 Remote digital loopback test enabled. TIME DISPLAY Type: Immediate Format: AT [cmds] Kn [cmds] Example: AT K1 *L2 #E1 Description: Displays the current call time or clock time. Command Function K0 Display length of last call. K1 Display actual time. TOUCH TONE RECOGNITION Type: Configuration Format: AT [cmds] %Tn [cmds] Example: AT %T &W Description: Controls recognition of touch tones while off hook. Command Function %T Enabled. BIT MAPPED REGISTER S34 Format: AT [cmds] S34=n [cmds] Example: ATS34=139 Default: 0 Range: 0 - 56 Unit: Bit-mapped Description: Controls V.23, MR LED function and MI/MIC. Bit Value Function 3 » 0 V.23 disabled. 1 V.23 enabled. 4 » 0 MR LED normal. 1 MR LED reflects DSR signal. 5 » 0 MI/MIC disabled. 1 MI/MIC enabled. VOICE/DATA SWITCH Type: Register Format: AT [cmds] S32=n [cmds] Example: ATS32=6 Default: 1 Unit: 1-7 Description: Controls the function of SW4. Command Function 0 Disabled. 1 Switch between voice and originate mode. 2 Switch between voice and answer mode. 3 Redial. 4 Dial number stored at position 0. 5 Enable and disable Auto Answer. 6 Reset. 7 Start remote digital loopback test.