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 |
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 <CR> | ||
Default: | 0 | ||
Range: | 0 - 255 | ||
Unit: | Bit-mapped | ||
Description: | Controls DTR reset, DTR dialing, reset dialing, and MNP3. | ||
Bit | Value | Function | |
0 | » 0 1 | DTR normal. Reset on low DTR. | |
1 | » 0 1 | Normal auto answer operation. When ring is received, enter originate and listen for answer tone. | |
2 | » 0 1 | Pause 250ms before displaying result codes. Immediate result code display. | |
3 | » 0 1 | DTR dialing disabled. DTR dialing enabled. | |
4 | » 0 1 | Reset dialing disabled. Reset dialing enabled. | |
5 | » 0 | Not used. | |
6 | » 0 1 | MNP 3 enabled. MNP 3 disabled. | |
7 | » 0 1 | Hardware reset disabled. Hardware reset enabled. |
BIT-MAPPED REGISTER S15 | |||
Format: | AT [cmds] S15=n [cmds] | ||
Example: | ATS15=139 <CR> | ||
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 1 | HST high frequency equalization enabled. HST high frequency equalization disabled. | |
1 | » 0 1 | Online fallback enabled. Online fallback disabled. | |
2 | » 0 1 | 450bps back channel enabled. 450bps back channel disabled. | |
3 | » 0 1 | Non-error-correcting mode transmit buffer set to 1.5KB. Non-error-correcting mode transmit buffer set to 128 bytes. | |
4 | » 0 1 | MNP 4 enabled. MNP 4 disabled. | |
5 | » 0 1 | Use backspace key for delete disabled. Use backspace key for delete enabled. | |
6 | » 0 1 | MNP normal. MNP adjusted for non compliant modems. | |
7 | » 0 1 | Proprietary network compatibility disabled. Proprietary network compatibility enabled. |
BREAK LENGTH | |
Type: | Register |
Format: | AT [cmds] S21=n [cmds] |
Example: | ATS21=20 <CR> |
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 <CR> |
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 <CR> |
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? <CR> |
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 <CR> |
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 <CR> |
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 <CR> |
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 <CR> |
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 <CR> |
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 <CR> |
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 <CR> |
Description: | 125ms pause for each /. |
HELP SCREENS | |
Type: | Immediate |
Format: | AT <prefix>$ |
Example: | AT &$ <CR> |
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 <CR> |
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? <CR> |
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 <CR> |
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 <CR> |
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 <CR> |
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<CR> |
Description: | Displays the current call time or clock time. |
Command | Function |
» K0 | Display length of last call. |
K1 | Display actual time. |