COURIER 2400E/PS modem/telephone/ISDN Settings and Configuration
U.S. ROBOTICS, INC.
COURIER 2400E/PS
Card Type | Modem (Asynchronous) |
Chip Set | U.S. Robotics |
Maximum Data Rate | 2400bps |
Data Bus | Unidentified |
Data Modulation Protocol | Unidentified |
V1983
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 |
í 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 | í 0 | Not used |
1 | í 01 | Auto-answer mode disabled Auto-answer mode on originate enabled |
2 | í 01 | Result code pause enabled Result code pause disabled |
3 | í 01 | DTR dialing disabled DTR dialing enabled |
4 | í 01 | Reset dialing disabled Reset dialing enabled, dials number at position 0 in NVRAM. |
5 | í 0 | Not used |
6 | í 01 | MNP 3 enabled MNP 3 disabled |
7 | í 01 | Hardware reset disabled 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 | í 01 | Normal operation Hang up on receiving +++ |
1 - 3 | í 000 | Not used |
4 | í 01 | MNP 4 enabled MNP 4 disabled |
5 | í 0 | Not used |
6 | í 01 | MNP normal 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 |
í &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 |
í &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 |
í &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 |
í &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 |
í &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 |
í 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 |
í 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 |
í 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 |
í &M4 | Normal/ARQ mode enabled |
&M5 | ARQ mode only enabled |
ESCAPE SEQUENCE | |
Type: | Immediate |
Format: | +++AT [cmds] <CR> |
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 |
í &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 |
í &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 |
í &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 |
í &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 |
í &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 |
í 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 |
í &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 |
í &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 <CR>. | |
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 |
í 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 |
í 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. |
í 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 |
í 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 |
í 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 | |
í 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. | |
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