U.S. ROBOTICS, INC. =================== AUTO DIAL 21A Card Type Modem (asynchronous) Chip Set U.S. Robotics Maximum Data Rate 1200bps Data Bus External Data Modulation Protocol Bell 212A V2252 +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Function | Label | Function | Label | |------------------------------------------------------------| | Line out/in - unidentified | CN1 | DC power | CN4 | |----------------------------+---------+---------------+-----| | Line in/out - unidentified | CN2 | Power switch | SW1 | |----------------------------+---------+---------------+-----| | RS-232/422 | CN3 | Analog | SW2 | | | | loopback | | | | | switch | | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Setting | Label | Position | |-----------------------------------------+-------+----------| | Auto answer disabled | SW3/A | Off | |-----------------------------------------+-------+----------| | Auto answer enabled | SW3/A | On | |-----------------------------------------+-------+----------| | CD normal | SW3/B | On | |-----------------------------------------+-------+----------| | CD forced high | SW3/B | Off | |-----------------------------------------+-------+----------| | Equalize for dial-up phone lines | SW3/C | Off | |-----------------------------------------+-------+----------| | Equalize for dedicated phone lines | SW3/C | On | |-----------------------------------------+-------+----------| | DTR normal | SW3/D | Off | |-----------------------------------------+-------+----------| | DTR forced high | SW3/D | On | +------------------------------------------------------------+ +------------------------------------------------------------+ | RS232C | |------------------------------------------------------------| | Setting | SW4/A | SW4/B | SW4/C | SW4/D | |--------------------------+--------+--------+-------+-------| | Pin 2 receive/Pin 3 send | On | On | Off | Off | |--------------------------+--------+--------+-------+-------| | Pin 2 send/Pin 3 receive | Off | Off | On | On | +------------------------------------------------------------+ +-------------------------------+ | MISCELLANEOUS TECHNICAL NOTES | |-------------------------------| | Note: Diagram not available. | +-------------------------------+ +------------------------------------------------------------+ | DIAGNOSTIC LED(S) | |------------------------------------------------------------| | LED | Color | Status | Condition | |-----+-------+--------+-------------------------------------| | CD | Red | On | Carrier signal detected | |-----+-------+--------+-------------------------------------| | CD | Red | Off | Carrier signal not detected | |-----+-------+--------+-------------------------------------| | HS | Red | On | Modem is operating at 1200bps | |-----+-------+--------+-------------------------------------| | HS | Red | Off | Modem is operating at slower than | | | | | 1200bps | |-----+-------+--------+-------------------------------------| | OH | Red | On | Modem is off-hook | |-----+-------+--------+-------------------------------------| | OH | Red | Off | Modem is on-hook | |-----+-------+--------+-------------------------------------| | TR | Red | On | DTR signal is high | |-----+-------+--------+-------------------------------------| | TR | Red | Off | DTR signal is low | |-----+-------+--------+-------------------------------------| | RD | Red | On | Modem is receiving data | |-----+-------+--------+-------------------------------------| | RD | Red | Off | Modem is not receiving data | |-----+-------+--------+-------------------------------------| | AN | Red | On | Auto-answer enabled | |-----+-------+--------+-------------------------------------| | AN | Red | Off | Auto-answer disabled | |-----+-------+--------+-------------------------------------| | SD | Red | On | Modem is transmitting data | |-----+-------+--------+-------------------------------------| | SD | Red | Off | Modem is not transmitting data | |-----+-------+--------+-------------------------------------| | AL | Red | On | Modem is in analog loopback test | | | | | mode | |-----+-------+--------+-------------------------------------| | AL | Red | Off | Modem is not in analog loopback | | | | | test mode | |-----+-------+--------+-------------------------------------| | ON | Red | On | Power is on | |-----+-------+--------+-------------------------------------| | ON | Red | Off | Power is off | +------------------------------------------------------------+ Proprietary AT Command Set +------------------------------------------------------------+ | ABORT | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | Any key | |--------------+---------------------------------------------| | Description: | Aborts dialing command issued; modem hangs | | | up. | +------------------------------------------------------------+ +------------------------------------------------------------+ | ANSWER | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] A | |--------------+---------------------------------------------| | Description: | Enables answer mode, the modem goes | | | off-hook. | +------------------------------------------------------------+ +------------------------------------------------------------+ | ATTENTION | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] | |--------------+---------------------------------------------| | Description: | Tells the modem that a command follows or | | | use alone to test OK result code | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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 | +------------------------------------------------------------+ +------------------------------------------------------------+ | ECHO | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] En [cmds] | |--------------+---------------------------------------------| | Description: | Controls echo function; display keyboard | | | commands when enabled. | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | i E0 | Echo function disabled | |--------------+---------------------------------------------| | 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 | |--------------+---------------------------------------------| | 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. | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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. | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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 . | +------------------------------------------------------------+ +------------------------------------------------------------+ | RESET | |------------------------------------------------------------| | Type: | Immediate | |--------------+---------------------------------------------| | Format: | AT [cmds] Z [cmds] | |--------------+---------------------------------------------| | Description: | Resets the modem and clears all registers | | | to default values | +------------------------------------------------------------+ +------------------------------------------------------------+ | RESULT CODES | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] Qn [cmds] | |--------------+---------------------------------------------| | Description: | Enables modem to send result codes to the | | | DTE | |--------------+---------------------------------------------| | Command | Function | |--------------+---------------------------------------------| | i 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 | |--------------+---------------------------------------------| | i 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 | |--------------+---------------------------------------------| | i X0 | Extended result codes disabled; result | | | codes 0-4 enabled. | |--------------+---------------------------------------------| | X1 | Extended result codes enabled; result codes | | | 0-5 enabled | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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 | +------------------------------------------------------------+ +------------------------------------------------------------+ | STATUS-REGISTER | |------------------------------------------------------------| | Type: | Configuration | |--------------+---------------------------------------------| | Format: | AT [cmds] Sn=x [cmds] | |--------------+---------------------------------------------| | Description: | Writes to a specified register, values | | | ranging from 0-255. | |------------------------------------------------------------| | Command | Function | |---------------+--------------------------------------------| | S0=x | Sets the number of rings allowed before | | | the modem automatically goes off-hook. | | | | | | S0=0 will disable auto-answer. | |---------------+--------------------------------------------| | S2=x | Selects a character used for the escape | | | sequence. | | | | | | Default = 43 | |---------------+--------------------------------------------| | S7=x | Maximum wait time in seconds the modem | | | uses after dialing to detect a carrier | | | signal from the remote modem for both | | | originating and answering calls. | | | | | | Default = 30 | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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. |