U.S. ROBOTICS, INC. COURIER HST Modem Type Data (synchronous/asynchronous) Maximum Data Rate 9600bps Data Bus External Data Modulation Protocol Bell 103A/212A ITU-T V.22bis USR HST Error Correction/Compression MNP5 [Image] CONNECTIONS Purpose Location Purpose Location Line in CN1 DC power CN4 Line out CN2 Power switch SW2 RS-232/422 CN3 DTR SIGNAL Setting SW1/1 » On DTR forced high Off DTR normal RESULT CODES Setting SW1/2 » Off Verbal result codes enabled On Numeric result codes enabled RESULT CODES DISPLAY Setting SW1/3 » On Display disabled Off Display enabled ECHO COMMANDS DISPLAY Setting SW1/4 » Off Local echo enabled On Local echo disabled AUTO ANSWER Setting SW1/5 » On Modem does not answer on first ring Off Modem answers on first ring CARRIER DETECT Setting SW1/6 » Off CD normal On CD forced high MULTILINE PHONE INSTALLATION Setting SW1/7 » Off Single phone connected On Multiple phones connected AT COMMAND SET Setting SW1/8 » On AT command set recognized Off AT command set disabled ESCAPE CODE Setting SW1/9 » On Go to command mode and display OK result code when escape character is received Off Disconnect, go to command mode and display NO CARRIER when escape character is received USER PROFILE Setting SW1/10 » Off Use stored profile On Use factory default TX/RX PIN ASSIGNMENT Setting SW3 » Off Normal operation On Reverse TX/RX pin assignments DIAGNOSTIC LED(S) LED Color Status Condition HS Red On Modem is operating at 9600bps HS Red Off Modem is operating at slower than 9600bps 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 Modem is retraining or in 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 correction enabled EC Red Off Error correction disabled EC Red Blinking Modem is retransmitting data AL Red On Analog loopback self test mode enabled. AL Red Off Normal operation 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, reset dialing, and MNP3. Bit Value Function 0 » 0 DTR normal. 1 Reset on low DTR. 1 » 0 Normal auto answer operation. 1 When ring is received, enter originate and listen for answer tone. 2 » 0 Pause 250ms before displaying result codes. 1 Immediate result code display. 3 » 0 DTR dialing disabled. 1 DTR dialing enabled. 4 » 0 Reset dialing disabled. 1 Reset dialing enabled. 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] Example: ATS15=139 Default: 0 Range: 0 - 255 Unit: Bit-mapped Description: Controls HST high frequency equalization, online fallback, back channel, non-error-correcting mode buffer, MNP4, 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. 7 » 0 Proprietary network compatibility disabled. 1 Proprietary network compatibility enabled. 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 correction 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. &Y3 Break does not empty buffer and is sent with transmitted data. 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 DISCONNECT DISPLAY Type: Immediate Format: AT [cmds] S17? [cmds] Example: ATS17? Default: Read only Range: 1-6, 254, 255 Description: Displays the reason for a disconnect during error correcting mode. Value Meaning S17=1 Received data different than requested. S17=2 Incompatible MNP protocol. S17=3 Connection request parameters unknown. S17=4 Remote modem retry timeout. S17=5 Inactivity timeout. S17=6 Destination user not found. S17=254 Peer protocol error. S17=255 User initiated disconnect. ERROR CORRECTION MODE Type: Configuration Format: AT [cmds] &Mn [cmds] Example: AT &M1 %C1 Description: Selects active error correction protocols. Command Function &M0 Normal mode only. » &M4 Auto-detect mode. &M5 ARQ mode only. 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. 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 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 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. &I3 Hewlett-Packard host mode. &I4 Hewlett-Packard Terminal mode. &I5 XON/XOFF passthrough for non error correction mode enabled. 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. PAUSE Type: Configuration Format: AT [cmds] / [cmds] Example: AT /// &W Description: 125ms pause for each /. 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& 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. NO CARRIER DISPLAY Type: Immediate Format: AT [cmds] S20? [cmds] Example: ATS20? Default: Read only Range: 0-7 Description: Displays the reason for a NO CARRIER result code.. Value Meaning S20=0 Key press abort. S20=1 DTR low. S20=2 Escape code sent. S20=3 Connection broken. S20=4 Inactivity timeout. S20=5 Automatic hangup with error correction incompatibility . S20=6 Error correction retry timeout. S20=7 Error correction received disconnect. REGISTER S18 Note: This register is reserved and should not be changed. 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 call duration. I4 Reports current command settings. I5 Reports current NVRAM settings. I6 Reports current connection’s statistics. I7 Reports configuration. TEST MODES Type: Register Format: AT [cmds] S16=n [cmds] Example: ATS16=0 Description: Controls analog loopback pattern and dial tests Command Function » S16=0 Testing disabled. S16=1 Analog loopback test enabled. S16=2 Dial test enabled. S16=4 Test pattern enabled. S16=5 Analog loopback with test pattern 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.