U.S. ROBOTICS, INC.
DIRECT 2400
Card Type | Modem (asynchronous) |
Chip Set | U.S.Robotics |
Maximum Data Rate | 2400bps |
Data Bus | External |
Data Modulation Protocol | Unidentified |
CONNECTIONS | ||||||
Function | Label | Function | Label | |||
Line out/in - Unidentified | CN1 | DC power - Unidentified | CN4 | |||
Line in/out - Unidentified | CN2 | Power switch - Unidentified | SW1 | |||
RS-232/422 - Unidentified | CN3 |
USER CONFIGURABLE SETTINGS | ||
Setting | Label | Position |
í DTR normal | SW1/1 | On |
DTR Forced high | SW1/1 | Off |
í Verbose result codes | SW1/2 | Off |
Numeric result codes | SW1/2 | On |
í Result codes enabled | SW1/3 | On |
Result codes disabled | SW1/3 | Off |
í Commands displayed | SW1/4 | Off |
Commands not displayed | SW1/4 | On |
í Auto-answer mode enabled | SW1/5 | Off |
Auto-answer mode disabled | SW1/5 | On |
í CD signal forced high | SW1/6 | On |
CD signal normal | SW1/6 | Off |
í RJ-11 jack | SW1/7 | Off |
RJ-12, RJ-13 jack | SW1/7 | On |
í Smart mode | SW1/8 | On |
Dumb mode | SW1/8 | Off |
DIAGNOSTIC LED(S) | |||
LED | Color | Status | Condition |
Left | Green | On | Modem is in data mode |
Left | Green | Off | Modem is not data mode |
Left | Red | On | Modem is in analog loopback test mode |
Left | Red | Blinking | Power on/self-test in progress |
Right | Green | On | Carrier signal detected/ready to send data |
Right | Green | Off | Carrier signal not detected/not ready to send data |
Right | Red | Off | Modem is not receiving data/not displaying result codes |
Right | Red | Blinking | Modem is receiving data/display result codes |
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 manual 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 |
í 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 |
CLOCK | ||
Type: | Configuration | |
Format: | AT [cmds] Kn [cmds] | |
Description: | Displays connection duration or real time | |
Command | Function | |
í K0 | Connection duration displayed in ATI3 | |
K1 | Real time displayed in ATI3. To set clock (military time) use ATI3=HH:MM:SSK1. |
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 |
; | Modem returned to command state after dialing. Can only be placed at the end of the dial command. |
" | Dials letters as if they were numbers; ATDT"GOMICRO" |
! | Flash function initiated |
@ | Dial, wait for quiet answer, then continue to execute the rest of the dial string |
W | Dial, wait for second dial tone, then continue to execute the rest of the dial string |
R | Answer mode enabled; originate mode disabled following handshake initiation. |
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 data sent while in data mode are echoed |
Command | Function |
F0 | Local echo enabled |
í F1 | Local echo disabled |
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. |
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 |
HELP SCREEN - CONTROLS | ||
Type: | Immediate | |
Format: | <Ctrl> C, K or S | |
Description: | Cancel; or stop/restart scrolling of help screens | |
Command | Function | |
<Ctrl> C | Cancel display of help screen | |
<Ctrl> K | Cancel display of help screen | |
<Ctrl> S | Stop/restart scrolling of help screens |
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) |
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: | Returns to on-line command (data transmission) mode. |
Note: The O command must be placed at the end of the command string. |
ON-LINE HELP | |
Type: | Immediate |
Format: | AT [cmds] $ [cmds] |
Description: | On-line help; displays basic command list. |
PRODUCT CODE | |
Type: | Register |
Format: | AT [cmds] S14 [cmds] |
Description: | Stores product code, displayed in ATI0. |
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) |
RECEIVE-ONLY | ||
Type: | Configuration | |
Format: | AT [cmds] Cn [cmds] | |
Description: | Sets receive-only; used if modem is attached to additional monitoring-only systems | |
Command | Function | |
C0 | Disables transmitter | |
í C1 | Enables transmitter |
REPEAT COMMAND STRING | |
Type: | Configuration |
Format: | AT [cmds] > [cmds] |
Example: | AT>DT5551212 or ATDT5551212> |
Description: | Causes modem to repeat command string until a keyboard key is pressed |
Note: If used before or after the ATD command, the modem will redial the number until a connection is established or a maximum of ten attempts is reached. |
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 test (OK or ERROR, followed by OK) |
I3 | Reports connection duration and real time |
I4 | Reports current command 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 0-5 and 10 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 0-12 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. |
SOFT RESET | |
Type: | Immediate |
Format: | AT [cmds] Zn [cmds] |
Description: | Restores modem software default profile |
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. |
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 |
TEST MODES | ||
Type: | Configuration | |
Format: | AT [cmds] S16=n [cmds] | |
Description: | Controls loopback tests, analog, digital, dial and self tests. | |
Command | Function | |
S16=0 | Testing disabled | |
S16=1 | Local analog loopback enabled | |
S16=2 | Dial test (Factory testing only) | |
S16=4 | Test pattern enabled (transmitted on CONNECT, either on answering or originate) | |
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. |