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 - | 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 | |-----------------------------------------+-------+----------| | i DTR normal | SW1/1 | On | |-----------------------------------------+-------+----------| | DTR Forced high | SW1/1 | Off | |-----------------------------------------+-------+----------| | i Verbose result codes | SW1/2 | Off | |-----------------------------------------+-------+----------| | Numeric result codes | SW1/2 | On | |-----------------------------------------+-------+----------| | i Result codes enabled | SW1/3 | On | |-----------------------------------------+-------+----------| | Result codes disabled | SW1/3 | Off | |-----------------------------------------+-------+----------| | i Commands displayed | SW1/4 | Off | |-----------------------------------------+-------+----------| | Commands not displayed | SW1/4 | On | |-----------------------------------------+-------+----------| | i Auto-answer mode enabled | SW1/5 | Off | |-----------------------------------------+-------+----------| | Auto-answer mode disabled | SW1/5 | On | |-----------------------------------------+-------+----------| | i CD signal forced high | SW1/6 | On | |-----------------------------------------+-------+----------| | CD signal normal | SW1/6 | Off | |-----------------------------------------+-------+----------| | i RJ-11 jack | SW1/7 | Off | |-----------------------------------------+-------+----------| | RJ-12, RJ-13 jack | SW1/7 | On | |-----------------------------------------+-------+----------| | i 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 | |--------------+---------------------------------------------| | i 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 | |---------------+--------------------------------------------| | i 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 | |--------------+---------------------------------------------| | i 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 | |--------------+---------------------------------------------| | i F1 | Local echo disabled | +------------------------------------------------------------+ +------------------------------------------------------------+ | ESCAPE SEQUENCE | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | +++AT [cmds] | |--------------+---------------------------------------------| | 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 | |--------------+---------------------------------------------| | i &G0 | Guard tone disabled | |--------------+---------------------------------------------| | &G1 | 550Hz guard tone enabled | |--------------+---------------------------------------------| | &G2 | 1800Hz guard tone enabled | +------------------------------------------------------------+ +------------------------------------------------------------+ | HELP SCREEN - CONTROLS | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | C, K or S | |--------------+---------------------------------------------| | Description: | Cancel; or stop/restart scrolling of help | | | screens | |------------------------------------------------------------| | Command | Function | |----------------+-------------------------------------------| | C | Cancel display of help screen | |----------------+-------------------------------------------| | K | Cancel display of help screen | |----------------+-------------------------------------------| | 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 | |-----------------------+------------------------------------| | i 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 . | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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. | |--------------+---------------------------------------------| | i 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 | |--------------+---------------------------------------------| | i 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. | +------------------------------------------------------------+