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# 3COM CORPORATION
US ROBOTICS 14,400/PC, US ROBOTICS 14,400/PC FAX
Card Type Modem (asynchronous)
Chipset U.S. Robotics
Maximum Data Rate 14.4Kbps
Maximum Fax Rate 14.4Kbps (fax model only)
Data Modulation Bell 103A/212A
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 (fax
model only)
Error MNP5, V.42, V.42bis
Correction/Compression
Fax Class Class I (fax model only)
Data Bus 8-bit ISA
Card Size Full height, one-third length
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|----------------------+-------+---------------------+-------|
| Telephone line out | CN1 | Telephone line in | CN2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+-------+-----------|
| í DTR normal | SW1/1 | Off |
|----------------------------------------+-------+-----------|
| DTR forced high | SW1/1 | On |
|----------------------------------------+-------+-----------|
| í Modem sends verbose result codes | SW1/2 | Off |
|----------------------------------------+-------+-----------|
| Modem sends numeric result codes | SW1/2 | On |
|----------------------------------------+-------+-----------|
| í Result codes enabled | SW1/3 | On |
|----------------------------------------+-------+-----------|
| Result codes disabled | SW1/3 | Off |
|----------------------------------------+-------+-----------|
| í Command mode echo enabled | SW1/4 | Off |
|----------------------------------------+-------+-----------|
| Command mode echo enabled | SW1/4 | On |
|----------------------------------------+-------+-----------|
| í Auto-answer disabled | SW1/5 | On |
|----------------------------------------+-------+-----------|
| Auto-answer controlled by S0 | SW1/5 | Off |
|----------------------------------------+-------+-----------|
| í DCD normal | SW1/6 | Off |
|----------------------------------------+-------+-----------|
| DCD forced high | SW1/6 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS (CON'T) |
|------------------------------------------------------------|
| Setting | Label | Position |
|-----------------------------------------+-------+----------|
| í Load settings from profile specified | SW1/7 | Off |
| by Y command | | |
|-----------------------------------------+-------+----------|
| Load settings from factory defaults | SW1/7 | On |
|-----------------------------------------+-------+----------|
| í Command set enabled | SW1/8 | On |
|-----------------------------------------+-------+----------|
| Command set disabled | SW1/8 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | JP1/A | JP1/B | JP1/C | JP1/D |
|--------------+-----------+-----------+----------+----------|
| 3F8h (COM1:) | Closed | Open | Open | Open |
|--------------+-----------+-----------+----------+----------|
| 2E8h (COM2:) | Open | Closed | Open | Open |
|--------------+-----------+-----------+----------+----------|
| 3F8h (COM3:) | Open | Open | Closed | Open |
|--------------+-----------+-----------+----------+----------|
| 2E8h (COM4:) | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| Setting | JP2/A | JP2/B | JP2/C | JP2/D | JP2/E |
|----------+---------+---------+---------+---------+---------|
| 2 | Closed | Open | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 3 | Open | Closed | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 4 | Open | Open | Closed | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 5 | Open | Open | Open | Closed | Open |
|----------+---------+---------+---------+---------+---------|
| 7 | Open | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SUPPORTED STANDARD COMMANDS |
|------------------------------------------------------------|
| Basic AT Commands |
|------------------------------------------------------------|
| +++, ‘comma’, A/ |
|------------------------------------------------------------|
| A, B, D, E, H, L, M, O, V, X, Z |
|------------------------------------------------------------|
| &C, &D, &F, &G, &P, &R, &S, &T, &W, &Z |
|------------------------------------------------------------|
| S-Registers |
|------------------------------------------------------------|
| S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, |
| S18, S25, S38 |
|------------------------------------------------------------|
| Note: See MHI help file for complete information. |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S13 |
|------------------------------------------------------------|
| Format | AT [cmds] S13=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 89 |
|--------------+---------------------------------------------|
| Description: | Controls DTR reset, DTR dialing, reset |
| | dialing, and MNP3. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | DTR normal. |
| | | |
| | 1 | Reset on low DTR. |
|------+-------+---------------------------------------------|
| 2, 1 | 00 | Not used. |
|------+-------+---------------------------------------------|
| 3 | í 0 | DTR dialing disabled. |
| | | |
| | 1 | DTR dialing enabled. |
|------+-------+---------------------------------------------|
| 4 | í 0 | Reset dialing disabled. |
| | | |
| | 1 | Reset dialing enabled. |
|------+-------+---------------------------------------------|
| 5 | 0 | Not used. |
|------+-------+---------------------------------------------|
| 6 | í 0 | MNP 3 enabled. |
| | | |
| | 1 | MNP 3 disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S15 |
|------------------------------------------------------------|
| Format: | AT [cmds] S15=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 56 |
|--------------+---------------------------------------------|
| Description: | Controls non-error-correcting mode buffer, |
| | MNP4, and BS/DEL switch. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 2 - | 000 | Not used. |
| 0 | | |
|------+-------+---------------------------------------------|
| 3 | í 0 | Non-error-correcting mode transmit buffer |
| | | set to 1.5KB. |
| | 1 | |
| | | Non-error-correcting mode transmit buffer |
| | | set to 128 bytes. |
|------+-------+---------------------------------------------|
| 4 | í 0 | MNP 4 enabled. |
| | | |
| | 1 | MNP 4 disabled. |
|------+-------+---------------------------------------------|
| 5 | í 0 | Backspace and delete keys normal. |
| | | |
| | 1 | Backspace and delete keys reversed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S27 |
|------------------------------------------------------------|
| Format: | AT [cmds] S27=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 191 |
|--------------+---------------------------------------------|
| Description: | Controls V.21, V.32 encoding and |
| | modulation, V.42 answer tone and handshake, |
| | and 9600 result codes. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | V.21 disabled. |
| | | |
| | 1 | V.21 enabled. |
|------+-------+---------------------------------------------|
| 1 | í 0 | V.32 trellis coding enabled. |
| | | |
| | 1 | V.32 trellis coding disabled. |
|------+-------+---------------------------------------------|
| 2 | í 0 | V.32 modulation enabled. |
| | | |
| | 1 | V.32 modulation disabled. |
|------+-------+---------------------------------------------|
| 3 | í 0 | 2100Hz answer tone enabled. |
| | | |
| | 1 | 2100Hz answer tone disabled. |
|------+-------+---------------------------------------------|
| 5, 4 | í 00 | V.42 detect, LAPM and MNP enabled. |
| | | |
| | 01 | V.42 detect and LAPM enabled. |
| | | |
| | 10 | MNP enabled. |
| | | |
| | 11 | LAPM enabled. |
|------+-------+---------------------------------------------|
| 6 | 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] |
|--------------+---------------------------------------------|
| Default: | 10 |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | 10 ms |
|--------------+---------------------------------------------|
| Description: | Sets the length of error control mode |
| | breaks sent from DCE to DTE. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Yn [cmds] |
|--------------+---------------------------------------------|
| 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. |
|--------------+---------------------------------------------|
| &Y3 | Break does not empty buffer and is sent in |
| | sequence with data. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the type of data compression that |
| | will be used. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &K0 | Data compression disabled. |
|--------------+---------------------------------------------|
| í &K1 | Auto-detect compression mode. |
|--------------+---------------------------------------------|
| &K2 | Data compression enabled. |
|--------------+---------------------------------------------|
| &K3 | MNP5 data compression only enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECTION SPEED LOWER LIMIT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Un [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets slowest allowed connection speed if &N |
| | is set to 1 or higher. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &U0 | No minimum connect speed. |
|--------------+---------------------------------------------|
| &U1 | Set minimum connect speed to 300bps. |
|--------------+---------------------------------------------|
| &U2 | Set minimum connect speed to 1200bps. |
|--------------+---------------------------------------------|
| &U3 | Set minimum connect speed to 2400bps. |
|--------------+---------------------------------------------|
| &U4 | Set minimum connect speed to 4800bps. |
|--------------+---------------------------------------------|
| &U5 | Set minimum connect speed to 7200bps. |
|--------------+---------------------------------------------|
| &U6 | Set minimum connect speed to 9600bps. |
|--------------+---------------------------------------------|
| &U7 | Set minimum connect speed to 12Kbps. |
|--------------+---------------------------------------------|
| &U8 | Set minimum connect speed to 14.4Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECTION SPEED UPPER LIMIT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Nn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets required connection speed if &U is set |
| | to 0; otherwise, sets fastest allowed |
| | connection speed. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &N0 | No maximum connect speed. |
|--------------+---------------------------------------------|
| &N1 | Set maximum connect speed to 300bps. |
|--------------+---------------------------------------------|
| &N2 | Set maximum connect speed to 1200bps. |
|--------------+---------------------------------------------|
| &N3 | Set maximum connect speed to 2400bps. |
|--------------+---------------------------------------------|
| &N4 | Set maximum connect speed to 4800bps. |
|--------------+---------------------------------------------|
| &N5 | Set maximum connect speed to 7200bps. |
|--------------+---------------------------------------------|
| &N6 | Set maximum connect speed to 9600bps. |
|--------------+---------------------------------------------|
| &N7 | Set maximum connect speed to 12Kbps. |
|--------------+---------------------------------------------|
| &N8 | Set maximum connect speed to 14.4Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays modem properties. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Displays product identification code. |
|--------------+---------------------------------------------|
| I1 | Tests and displays ROM checksum result. |
|--------------+---------------------------------------------|
| I2 | Tests and displays RAM checksum result. |
|--------------+---------------------------------------------|
| I4 | Displays current command settings. |
|--------------+---------------------------------------------|
| I5 | Displays current NVRAM settings. |
|--------------+---------------------------------------------|
| I6 | Displays current connection’s statistics. |
|--------------+---------------------------------------------|
| I7 | Displays product configuration. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ERROR CORRECTION MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Mn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects active error correction protocols. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &M0 | Normal mode only. |
|--------------+---------------------------------------------|
| í &M4 | Auto-detect mode. |
|--------------+---------------------------------------------|
| &M5 | ARQ mode only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ESCAPE CHARACTER RESPONSE |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S14=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls reaction to escape character. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| S14=0 | Normal operation. |
|--------------+---------------------------------------------|
| S14=1 | When +++ is received, modem disconnects and |
| | enters command state. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RESULT CODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &An [cmds] |
|--------------+---------------------------------------------|
| 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 - XOFF |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S23=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 19 |
|--------------+---------------------------------------------|
| Range: | 0 - 127 |
|--------------+---------------------------------------------|
| Unit: | 1 ASCII character |
|--------------+---------------------------------------------|
| Description: | Sets the character used to represent XOFF. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL CHARACTER - XON |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S22=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 17 |
|--------------+---------------------------------------------|
| Range: | 0 - 127 |
|--------------+---------------------------------------------|
| Unit: | 1 ASCII character |
|--------------+---------------------------------------------|
| Description: | Sets the character used to represent XON. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL - MODEM-TO-MODEM |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &In [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the type of modem-to-modem flow |
| | control used. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &I0 | Software flow control disabled. |
|--------------+---------------------------------------------|
| &I1 | XON/XOFF pass-through enabled. |
|--------------+---------------------------------------------|
| &I2 | XON/XOFF pass-through disabled. |
|--------------+---------------------------------------------|
| &I3 | Hewlett-Packard ENQ/ACK host mode enabled. |
|--------------+---------------------------------------------|
| &I4 | Hewlett-Packard ENQ/ACK terminal mode |
| | enabled. |
|--------------+---------------------------------------------|
| &I5 | XON/XOFF pass-through enabled in normal |
| | mode and disabled in error-correcting mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Hn [cmds] |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S19=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | 1 minute |
|--------------+---------------------------------------------|
| Description: | Sets the length of time that the modem does |
| | not receive information before it |
| | disconnects; S19=0 will disable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCK SERIAL PORT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Bn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets operation of serial port speed. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &B0 | Serial speed follows connect speed. |
|--------------+---------------------------------------------|
| &B1 | Serial speed locked. |
|--------------+---------------------------------------------|
| í &B2 | Serial speed locked in ARQ mode only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PROFILE ON POWER-UP |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Yn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the profile to restore into the |
| | active profile on power-up. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í Y0 | Restore profile 0 on power-up. |
|--------------+---------------------------------------------|
| Y1 | Restore profile 1 on power-up. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables modem to send result codes to the |
| | DTE. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í Q0 | Result codes enabled. |
|--------------+---------------------------------------------|
| Q1 | Result codes disabled. |
|--------------+---------------------------------------------|
| Q2 | Result codes enabled in originate mode |
| | only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE DIALING TEST |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S16=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Begins a tone dialing test. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í S16=0 | Tone dialing test disabled. |
|--------------+---------------------------------------------|
| S16=2 | Tone dialing test enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.32 AND V.32bis MODULATIONS |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S34=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 6 |
|--------------+---------------------------------------------|
| Range: | 0 - 15 |
|--------------+---------------------------------------------|
| Description: | Controls V.32 and V.32bis modulations. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | V.32bis enabled. |
| | | |
| | 1 | V.32bis disabled. |
|------+-------+---------------------------------------------|
| 2, 1 | 11 | Not used. |
|------+-------+---------------------------------------------|
| 3 | í 0 | V.32 modulation disabled. |
| | | |
| | 1 | V.32 modulation enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.32 HANDSHAKE TIME |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S28=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 8 |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | Sets length of V.32 handshake. |
+------------------------------------------------------------+