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# 3COM CORPORATION
AUTO DIAL 21A
Card Type Modem (asynchronous)
Chip Set U.S. Robotics
Maximum Data Rate 1200bps
Data Bus External
Data Modulation Protocol Bell 212A
54164
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| í 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 |
|--------------+---------------------------------------------|
| í 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 |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 <CR>. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| 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 |
|--------------+---------------------------------------------|
| í 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 |
|--------------+---------------------------------------------|
| í 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. |