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# 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
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line out/in - | CN1 | DC power - | CN4 |
| Unidentified | | Unidentified | |
|---------------------------+---------+----------------+-----|
| Line in/out - | CN2 | Power switch - | SW1 |
| Unidentified | | Unidentified | |
|---------------------------+---------+----------------+-----|
| 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. |
+------------------------------------------------------------+