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# 3COM CORPORATION
US ROBOTICS 14,400 EXTERNAL
Modem Type Data (synchronous/asynchronous)/Fax
Maximum Data Rate 14.4Kbps
Maximum Fax Rate 14.4Kbps
Data Bus External
Fax Class Class I
Data Modulation Bell 103A/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.23, V.32,
V.32bis
Fax Modulation ITU-T V.17, V.21CH2, V.27ter, V.29
Protocol
Error MNP5, V.42, V.42bis
Correction/Compression
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Line out | CN3 | DC power | CN1 |
|------------------+----------+-------------------+----------|
| Line in | CN4 | Volume | R1 |
|------------------+----------+-------------------+----------|
| RS-232/422 | CN2 | Power switch | SW2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DTR SIGNAL |
|------------------------------------------------------------|
| Setting | SW1/1 |
|-------------------------------+----------------------------|
| í DTR normal | Off |
|-------------------------------+----------------------------|
| DTR forced high | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES |
|------------------------------------------------------------|
| Setting | SW1/2 |
|-------------------------------+----------------------------|
| í Verbal result codes enabled | Off |
|-------------------------------+----------------------------|
| Numeric result codes enabled | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES DISPLAY |
|------------------------------------------------------------|
| Setting | SW1/3 |
|-------------------------------+----------------------------|
| í Enabled | On |
|-------------------------------+----------------------------|
| Disabled | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ECHO DISPLAY |
|------------------------------------------------------------|
| Setting | SW1/4 |
|-------------------------------+----------------------------|
| í Enabled | Off |
|-------------------------------+----------------------------|
| Disabled | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO ANSWER |
|------------------------------------------------------------|
| Setting | SW1/5 |
|-------------------------------+----------------------------|
| í Disabled | On |
|-------------------------------+----------------------------|
| Enabled | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CARRIER DETECT |
|------------------------------------------------------------|
| Setting | SW1/6 |
|-------------------------------+----------------------------|
| í CD normal | Off |
|-------------------------------+----------------------------|
| CD forced high | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SOFTWARE RESET |
|------------------------------------------------------------|
| Setting | SW1/7 |
|-------------------------------+----------------------------|
| í Use stored profile | Off |
|-------------------------------+----------------------------|
| Use factory default profile | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AT COMMAND SET |
|------------------------------------------------------------|
| Setting | SW1/8 |
|-------------------------------+----------------------------|
| Enabled | On |
|-------------------------------+----------------------------|
| Disabled | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Mode | Condition |
|---------+-------+----------+--------+----------------------|
| AA | Red | On | Answer | Auto-answer enabled |
|---------+-------+----------+--------+----------------------|
| AA | Red | Off | N/A | Auto-answer disabled |
|---------+-------+----------+--------+----------------------|
| AA | Red | Blinking | N/A | Phone is ringing |
|---------+-------+----------+--------+----------------------|
| CD | Red | On | N/A | Carrier signal |
| | | | | detected |
|---------+-------+----------+--------+----------------------|
| CD | Red | Off | N/A | Carrier signal not |
| | | | | detected |
|---------+-------+----------+--------+----------------------|
| RD | Red | Blinking | N/A | Modem is receiving |
| | | | | data or sending |
| | | | | result codes |
|---------+-------+----------+--------+----------------------|
| RD | Red | Off | N/A | Modem is not |
| | | | | receiving data |
|---------+-------+----------+--------+----------------------|
| SD | Red | Blinking | N/A | Modem is |
| | | | | transmitting data |
|---------+-------+----------+--------+----------------------|
| SD | Red | Off | N/A | Modem is not |
| | | | | transmitting data |
|---------+-------+----------+--------+----------------------|
| TR | Red | On | N/A | DTR signal is low |
|---------+-------+----------+--------+----------------------|
| TR | Red | Off | N/A | DTR signal is high |
|---------+-------+----------+--------+----------------------|
| CS | Red | On | N/A | CTS high |
|---------+-------+----------+--------+----------------------|
| CS | Red | Off | N/A | CTS normal |
|---------+-------+----------+--------+----------------------|
| ARQ/FAX | Red | On | Data | Error control |
| | | | | connection |
| | | | | established |
|---------+-------+----------+--------+----------------------|
| ARQ/FAX | Red | Blinking | Data | Error control data |
| | | | | is being transmitted |
|---------+-------+----------+--------+----------------------|
| ARQ/FAX | Red | Blinking | Fax | Modem is connected |
| | | | | in FAX mode |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S13 |
|------------------------------------------------------------|
| Format | AT [cmds] S13=n [cmds] |
|----------------+-------------------------------------------|
| Example: | ATS13=139<CR> |
|----------------+-------------------------------------------|
| Default: | 0 |
|----------------+-------------------------------------------|
| Range: | 0 - 159 |
|----------------+-------------------------------------------|
| Unit: | Bit-mapped |
|----------------+-------------------------------------------|
| Description: | Controls DTR reset, DTR dialing, Transmit |
| | buffer, backspace for delete, escape |
| | causes disconnect. |
|------------------------------------------------------------|
| Bit | Value | Function |
|----------+-------+-----------------------------------------|
| 0 | í 0 | DTR normal. |
| | | |
| | 1 | Reset on low DTR. |
|----------+-------+-----------------------------------------|
| 1 | í 0 | Non-error-correcting mode transmit |
| | | buffer set to 1.5KB. |
| | 1 | |
| | | Non-error-correcting mode transmit |
| | | buffer set to 128 bytes. |
|----------+-------+-----------------------------------------|
| 2 | í 0 | Use backspace key for delete disabled. |
| | | |
| | 1 | Use backspace key for delete enabled. |
|----------+-------+-----------------------------------------|
| 3 | í 0 | DTR dialing disabled. |
| | | |
| | 1 | DTR dialing enabled. |
|----------+-------+-----------------------------------------|
| 4 | í 0 | Reset dialing disabled. |
| | | |
| | 1 | Reset dialing enabled. |
|----------+-------+-----------------------------------------|
| 5 | í 0 | Not used. |
|----------+-------+-----------------------------------------|
| 6 | í 0 | Not used. |
|----------+-------+-----------------------------------------|
| 7 | í 0 | Escape code causes disconnect disabled. |
| | | |
| | 1 | Escape code causes disconnect enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S27 |
|------------------------------------------------------------|
| Format | AT [cmds] S27=n [cmds] |
|-----------------+------------------------------------------|
| Example: | ATS27=139<CR> |
|-----------------+------------------------------------------|
| Default: | 0 |
|-----------------+------------------------------------------|
| Range: | 0 - 191 |
|-----------------+------------------------------------------|
| Unit: | Bit-mapped |
|-----------------+------------------------------------------|
| Description: | Controls V.21, V.32 encoding and |
| | modulation, V.42 answer tone and |
| | handshake, V.32 fallback, V.32bis, 9600 |
| | result codes. |
|------------------------------------------------------------|
| Bit | Value | Function |
|----------+------------+------------------------------------|
| 0 | í 0 | V.21 disabled. |
| | | |
| | 1 | V.21 enabled. |
|----------+------------+------------------------------------|
| 1 | í 0 | V.32 trellis coding disabled. |
| | | |
| | 1 | V.32 trellis coding enabled. |
|----------+------------+------------------------------------|
| 2 | í 0 | V.32 modulation enabled. |
| | | |
| | 1 | V.32 modulation disabled. |
|----------+------------+------------------------------------|
| 3 | í 0 | 2100Hz answer tone enabled. |
| | | |
| | 1 | 2100Hz answer tone disabled. |
|----------+------------+------------------------------------|
| 4 | í 0 | V.32 fallback disabled. |
| | | |
| | 1 | V.32 fallback enabled. |
|----------+------------+------------------------------------|
| 5 | í 0 | V.32bis enabled. |
| | | |
| | 1 | V.32bis disabled. |
|----------+------------+------------------------------------|
| 6 | í 0 | Not used. |
|----------+------------+------------------------------------|
| 7 | í 0 | Actual result codes displayed. |
| | | |
| | 1 | Force 9600 result codes. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK LENGTH |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S21=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS21=20<CR> |
|--------------+---------------------------------------------|
| Default: | 10 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 10 milliseconds |
|--------------+---------------------------------------------|
| Description: | Sets the length of error correction mode |
| | breaks sent from DCE to DTE. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Yn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &Y0<CR> |
|--------------+---------------------------------------------|
| Description: | Configures action of break signal. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &Y0 | Break empties buffer. |
|--------------+---------------------------------------------|
| í &Y1 | Break empties buffer and is sent |
| | immediately. |
|--------------+---------------------------------------------|
| &Y2 | Break does not empty buffer and is sent |
| | immediately. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECTION SPEED UPPER LIMIT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Nn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &N1 DT555-1212<CR> |
|--------------+---------------------------------------------|
| Description: | Sets required connection speed if &U is set |
| | to 0. Otherwise, sets fastest allowed |
| | connection speed. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &N0 | Variable. |
|--------------+---------------------------------------------|
| &N1 | 300bps |
|--------------+---------------------------------------------|
| &N2 | 1200bps |
|--------------+---------------------------------------------|
| &N3 | 2400bps |
|--------------+---------------------------------------------|
| &N4 | 4800bps |
|--------------+---------------------------------------------|
| &N5 | 7200bps |
|--------------+---------------------------------------------|
| &N6 | 9600bps |
|--------------+---------------------------------------------|
| &N7 | 12Kbps |
|--------------+---------------------------------------------|
| &N8 | 14.4Kbps |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ERROR CORRECTION MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Mn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &M1 %C1<CR> |
|--------------+---------------------------------------------|
| Description: | Selects active error correction protocols. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &M0 | Normal mode, error correction disabled. |
|--------------+---------------------------------------------|
| í &M4 | Normal/ARQ. |
|--------------+---------------------------------------------|
| &M5 | ARQ mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ERROR CORRECTION |
|------------------------------------------------------------|
| Format | AT [cmds] S15=n [cmds] |
|----------------+-------------------------------------------|
| Example: | ATS15=139<CR> |
|----------------+-------------------------------------------|
| Default: | 0 |
|----------------+-------------------------------------------|
| Range: | 0 - 255 |
|----------------+-------------------------------------------|
| Unit: | Bit-mapped |
|----------------+-------------------------------------------|
| Description: | Controls error correction. |
|------------------------------------------------------------|
| Bit | Value | Function |
|----------+-------+-----------------------------------------|
| 0 | í 0 | V.22 error correction enabled. |
| | | |
| | 1 | V.22 error correction disabled. |
|----------+-------+-----------------------------------------|
| 1 | í 0 | V.22bis error correction enabled. |
| | | |
| | 1 | V.22bis error correction disabled. |
|----------+-------+-----------------------------------------|
| 2 | í 0 | V.32/V.32bis/V.32terbo error correction |
| | | enabled. |
| | 1 | |
| | | V.32/V.32bis/V.32terbo error correction |
| | | disabled. |
|----------+-------+-----------------------------------------|
| 3 | í 0 | MNP handshake enabled. |
| | | |
| | 1 | MNP handshake disabled. |
|----------+-------+-----------------------------------------|
| 4 | í 0 | MNP 4 enabled. |
| | | |
| | 1 | MNP 4 disabled. |
|----------+-------+-----------------------------------------|
| 5 | í 0 | MNP 3 enabled. |
| | | |
| | 1 | MNP 3 disabled. |
|----------+-------+-----------------------------------------|
| 6 | í 0 | MNP incompatibility disabled. |
| | | |
| | 1 | MNP incompatibility enabled. |
|----------+-------+-----------------------------------------|
| 7 | í 0 | V.42 enabled. |
| | | |
| | 1 | V.42 disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RESULT CODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &An [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &A1 %C1<CR> |
|--------------+---------------------------------------------|
| Description: | Selects extended result codes. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &A0 | Extended result codes disabled. |
|--------------+---------------------------------------------|
| &A1 | ARQ result codes enabled. |
|--------------+---------------------------------------------|
| &A2 | V.32 result code enabled. |
|--------------+---------------------------------------------|
| í &A3 | Error control and compression result codes |
| | enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL CHARACTER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S22=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS22=20<CR> |
|--------------+---------------------------------------------|
| Default: | 17 |
|--------------+---------------------------------------------|
| Range: | 0-127 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| Description: | Sets the character used to represent XON. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL CHARACTER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S23=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS23=20<CR> |
|--------------+---------------------------------------------|
| Default: | 19 |
|--------------+---------------------------------------------|
| Range: | 0-127 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| Description: | Sets the character used to represent XOFF. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL PASSTHROUGH |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &In [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &I0 &W<CR> |
|--------------+---------------------------------------------|
| Description: | Allows modem to act on, then transmit |
| | XON/XOFF characters. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &I0 | Software flow control disabled. |
|--------------+---------------------------------------------|
| &I1 | XON/XOFF passthrough enabled. |
|--------------+---------------------------------------------|
| &I2 | XON/XOFF passthrough disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Hn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT &H0 A<CR> |
|--------------+---------------------------------------------|
| Description: | Sets type of flow control used by modem. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &H0 | Flow control disabled. |
|--------------+---------------------------------------------|
| í &H1 | CTS/RTS flow control enabled. |
|--------------+---------------------------------------------|
| &H2 | XON/XOFF flow control enabled. |
|--------------+---------------------------------------------|
| &H3 | CTS/RTS and XON/XOFF flow control enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HELP SCREENS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT <prefix>$ |
|--------------+---------------------------------------------|
| Example: | AT &$<CR> |
|--------------+---------------------------------------------|
| Description: | Shows command help screens for all commands |
| | beginning with the given prefix, or no |
| | prefix if none is given. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| $ | Shows ATx help screen. |
|--------------+---------------------------------------------|
| &$ | Shows AT&x help screen. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S19=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS19=20<CR> |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 minute |
|--------------+---------------------------------------------|
| Description: | Sets the length of time that the modem does |
| | not receive information before it |
| | disconnects. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCK SERIAL PORT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Bn [cmds] |
|--------------+---------------------------------------------|
| Example: | AT $ &B0<CR> |
|--------------+---------------------------------------------|
| Description: | Sets operation of serial port speed. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &B0 | Serial speed follows connect speed |
|--------------+---------------------------------------------|
| í &B1 | Serial speed locked. |
|--------------+---------------------------------------------|
| &B2 | Serial speed locked in ARQ mode only, |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPORT INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Example: | AT I1 O<CR> |
|--------------+---------------------------------------------|
| Description: | Displays modem properties. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Reports product code. |
|--------------+---------------------------------------------|
| I1 | Reports ROM checksum result. |
|--------------+---------------------------------------------|
| I2 | Reports RAM checksum result. |
|--------------+---------------------------------------------|
| I3 | Reports firmware version. |
|--------------+---------------------------------------------|
| I4 | Reports current command settings. |
|--------------+---------------------------------------------|
| I5 | Reports current NVRAM settings. |
|--------------+---------------------------------------------|
| I6 | Reports current connection’s statistics. |
|--------------+---------------------------------------------|
| I7 | Reports configuration. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE DIALING TEST |
|------------------------------------------------------------|
| Format | AT [cmds] S16=n [cmds] |
|---------------+--------------------------------------------|
| Example: | ATS16=12<CR> |
|---------------+--------------------------------------------|
| Default: | 0 |
|---------------+--------------------------------------------|
| Range: | 0 - 2 |
|---------------+--------------------------------------------|
| Unit: | Bit-mapped |
|---------------+--------------------------------------------|
| Description: | Tone dialing test |
|------------------------------------------------------------|
| Bit | Value | Function |
|---------+--------+-----------------------------------------|
| 0 | 0 | Not used. |
|---------+--------+-----------------------------------------|
| 1 | í 0 | Tone dialing test disabled. |
| | | |
| | 1 | Tone dialing test enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.32 HANDSHAKE TIME |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S28=n [cmds] |
|--------------+---------------------------------------------|
| Example: | ATS28=20<CR> |
|--------------+---------------------------------------------|
| Default: | 8 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | Sets length of V.32 handshake. |
+------------------------------------------------------------+