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# 3COM CORPORATION
US ROBOTICS WINMODEM 28.8
Card Type Fax, Modem (asynchronous)
Chip Set U.S. Robotics
Maximum Data Rate 28.8Kbps
Maximum Fax Rate 14.4Kbps
Data Bus 8-bit ISA
Fax Class Class I & II
Data Modulation Bell 103/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.23, V.25,
V.32, V.32bis, V.34
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 |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line in | CN1 | Line out | CN2 |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| ANSWER |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] A |
|--------------+---------------------------------------------|
| Description: | Enables manual answer mode, the modem goes |
| | off-hook; pressing any key will abort. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ABORT |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | Any key |
|--------------+---------------------------------------------|
| Description: | Aborts answering/originating a call; modem |
| | hangs up. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ANSWER SEQUENCE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Bn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the answer sequence the modem will |
| | use |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í B0 | ITU-T answer sequence enabled |
|--------------+---------------------------------------------|
| B1 | U.S.(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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S13 |
|------------------------------------------------------------|
| Format | AT [cmds] S13=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-159 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls DTR reset, non-error-correcting |
| | mode buffer, DTR dialing, reset dialing, |
| | and 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, dials number at |
| | | position 0 in NVRAM. |
|------+-------+---------------------------------------------|
| 6, 5 | í 00 | Not used |
|------+-------+---------------------------------------------|
| 7 | í 0 | Disconnect as normal |
| | | |
| | 1 | Disconnect on escape code |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S15 |
|------------------------------------------------------------|
| Format | AT [cmds] S15=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls ARQ/MNP for |
| | V.22/22bis/32/32bis/32terbo, V.42 |
| | detection, MNP4 and 3, and MNP |
| | incompatibility. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | Error correction and data compression |
| | | enabled for V.22 |
| | 1 | |
| | | Error correction and data compression |
| | | disabled for V.22 |
|------+-------+---------------------------------------------|
| 1 | í 0 | Error correction and data compression |
| | | enabled for V.22bis |
| | 1 | |
| | | Error correction and data compression |
| | | disabled for V.22bis |
|------+-------+---------------------------------------------|
| 2 | í 0 | Error correction and data compression |
| | | enabled for V.32/32bis/32terbo |
| | 1 | |
| | | Error correction and data compression |
| | | disabled for V.32/32bis/32terbo |
|------+-------+---------------------------------------------|
| 7, 3 | í 00 | V.42 detection 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 normal |
| | | |
| | 1 | MNP adjusted for non compliant modems |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S27 |
|------------------------------------------------------------|
| Format | AT [cmds] S27=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-191 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| 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 non-trellis coding disabled |
| | | |
| | 1 | V.32 non-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.23 fallback mode disabled |
| | | |
| | 1 | V.23 fallback mode 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S32 |
|------------------------------------------------------------|
| Format: | AT [cmds] S32=n [cmds] |
|-----------------+------------------------------------------|
| Default: | 2 |
|-----------------+------------------------------------------|
| Range: | 0-27 |
|-----------------+------------------------------------------|
| Description: | Controls call indicate, V.8, V.34, and |
| | 33.6Kbps support |
|------------------------------------------------------------|
| Note: For 28.8 models |
|------------------------------------------------------------|
| Bit | Value | Function |
|----------+--------+----------------------------------------|
| 0 | 0 | Call indicate during V.34 operation |
| | | disabled |
| | 1 | |
| | | Call indicate during V.34 operation |
| | | enabled |
|------------------------------------------------------------|
| 1 | 0 | V.8 during V.34 operation disabled |
| | | |
| | í 1 | V.8 during V.34 operation enabled |
|--------------+------+--------------------------------------|
| 2 | í 0 | Not used |
|--------------+------+--------------------------------------|
| 3 | í 0 | V.34 enabled |
| | | |
| | 1 | V.34 disabled |
|--------------+------+--------------------------------------|
| 4 | í 0 | 33.6Kbps support enabled |
| | | |
| | 1 | 33.6Kbps support disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S33 |
|------------------------------------------------------------|
| Format: | AT [cmds] S33=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-191 |
|--------------+---------------------------------------------|
| Description: | Controls baud rate and shaping. |
|------------------------------------------------------------|
| Note: For 28.8 models |
|------------------------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | 2400 baud rate enabled |
| | | |
| | 1 | 2400 baud rate disabled |
|------+-------+---------------------------------------------|
| 1 | í 0 | 2743 baud rate enabled |
| | | |
| | 1 | 2743 baud rate disabled |
|------+-------+---------------------------------------------|
| 2 | í 0 | 2800 baud rate enabled |
| | | |
| | 1 | 2800 baud rate disabled |
|------+-------+---------------------------------------------|
| 3 | í 0 | 3000 baud rate enabled |
| | | |
| | 1 | 3000 baud rate disabled |
|------+-------+---------------------------------------------|
| 4 | í 0 | 3200 baud rate enabled |
| | | |
| | 1 | 3200 baud rate disabled |
|------+-------+---------------------------------------------|
| 5 | í 0 | 3429 baud rate enabled |
| | | |
| | 1 | 3429 baud rate disabled |
|------+-------+---------------------------------------------|
| 6 | í 0 | Not used |
|------+-------+---------------------------------------------|
| 7 | í 0 | Shaping enabled |
| | | |
| | 1 | Shaping disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S34 |
|------------------------------------------------------------|
| Format: | AT [cmds] S34=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Description: | Controls mapping, non-linear coding, TX |
| | level deviation, pre-emphasis, and |
| | pre-coding. |
|------------------------------------------------------------|
| Note: For 28.8 models |
|------------------------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | 8S-2D map enabled |
| | | |
| | 1 | 8S-2D map disabled |
|------+-------+---------------------------------------------|
| 1 | í 0 | 16S-4D map enabled |
| | | |
| | 1 | 16S-4D map disabled |
|------+-------+---------------------------------------------|
| 2 | í 0 | 32S-2D map enabled |
| | | |
| | 1 | 32S-2D map disabled |
|------+-------+---------------------------------------------|
| 3 | í 0 | 64S-4D map enabled |
| | | |
| | 1 | 64S-4D map disabled |
|------+-------+---------------------------------------------|
| 4 | í 0 | Non linear coding enabled |
| | | |
| | 1 | Non linear coding disabled |
|------+-------+---------------------------------------------|
| 5 | í 0 | TX level deviation enabled |
| | | |
| | 1 | TX level deviation disabled |
|------+-------+---------------------------------------------|
| 6 | í 0 | Pre-emphasis enabled |
| | | |
| | 1 | Pre-emphasis disabled |
|------+-------+---------------------------------------------|
| 7 | í 0 | Pre-coding enabled |
| | | |
| | 1 | Pre-coding disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK LENGTH |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S21=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 10 |
|--------------+---------------------------------------------|
| Range: | Unidentified |
|--------------+---------------------------------------------|
| Unit: | .01 second |
|--------------+---------------------------------------------|
| 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 | Empty buffer only |
|--------------+---------------------------------------------|
| í &Y1 | Empties buffer and break is sent |
| | immediately |
|--------------+---------------------------------------------|
| &Y2 | Do not empty buffer and break is sent |
| | immediately |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CARRIER DETECT (CD) |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Cn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the CD signal |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &C0 | Modem does not respond to CD signal |
|--------------+---------------------------------------------|
| í &C1 | CD signal normal |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects data compression |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &K0 | Data compression disabled |
|--------------+---------------------------------------------|
| í &K1 | Auto enabled/disable data compression |
|--------------+---------------------------------------------|
| &K2 | Data compression enabled |
|--------------+---------------------------------------------|
| &K3 | MNP5 data compression disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECTION SPEED LOWER LIMIT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Un [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets minimum required connection speed |
|------------------------------------------------------------|
| Note: 16.8 - 28.8bps for 28.8 models |
|------------------------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &U0 | Disabled |
|--------------+---------------------------------------------|
| &U1 | 300bps |
|--------------+---------------------------------------------|
| &U2 | 1200bps |
|--------------+---------------------------------------------|
| &U3 | 2400bps |
|--------------+---------------------------------------------|
| &U4 | 4800bps |
|--------------+---------------------------------------------|
| &U5 | 7200bps |
|--------------+---------------------------------------------|
| &U6 | 9600bps |
|--------------+---------------------------------------------|
| &U7 | 12Kbps |
|--------------+---------------------------------------------|
| &U8 | 14.4Kbps |
|--------------+---------------------------------------------|
| &U9 | 16.8Kbps |
|--------------+---------------------------------------------|
| &U10 | 19.2Kbps |
|--------------+---------------------------------------------|
| &U11 | 21.6Kbps |
|--------------+---------------------------------------------|
| &U12 | 24Kbps |
|--------------+---------------------------------------------|
| &U13 | 26.4Kbps |
|--------------+---------------------------------------------|
| &U14 | 28.8Kbps |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECTION SPEED UPPER LIMIT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Nn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets maximum required connection speed, |
| | modem will hang up if it cannot connect. |
|------------------------------------------------------------|
| Note: 16.8 - 28.8bps for 28.8 models |
|------------------------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &N0 | Variable |
|--------------+---------------------------------------------|
| &N1 | 300bps |
|--------------+---------------------------------------------|
| &N2 | 1200bps |
|--------------+---------------------------------------------|
| &N3 | 2400bps |
|--------------+---------------------------------------------|
| &N4 | 4800bps |
|--------------+---------------------------------------------|
| &N5 | 7200bps |
|--------------+---------------------------------------------|
| &N6 | 9600bps |
|--------------+---------------------------------------------|
| &N7 | 12Kbps |
|--------------+---------------------------------------------|
| &N8 | 14.4Kbps |
|--------------+---------------------------------------------|
| &N9 | 16.8Kbps |
|--------------+---------------------------------------------|
| &N10 | 19.2Kbps |
|--------------+---------------------------------------------|
| &N11 | 21.6Kbps |
|--------------+---------------------------------------------|
| &N12 | 24Kbps |
|--------------+---------------------------------------------|
| &N13 | 26.4Kbps |
|--------------+---------------------------------------------|
| &N14 | 28.8Kbps |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA SET READY (DSR) |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Sn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects DSR options |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &S0 | DSR forced high |
|--------------+---------------------------------------------|
| &S1 | DSR controlled by modem |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA TERMINAL READY (DTR) |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Dn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects modem response to DTR |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &D0 | Modem does not respond to DTR |
|--------------+---------------------------------------------|
| &D1 | Modem goes to command mode after DTR |
| | toggles |
|--------------+---------------------------------------------|
| í &D2 | Modem uses DTR as normal |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 to a maximum |
| | amount of time specified in S8 register |
|--------------+---------------------------------------------|
| ; | Modem returned to command state after |
| | dialing. Can only be placed at the end of |
| | the dial command. |
|--------------+---------------------------------------------|
| " | Dials letters that follow, ATDT"GOMICRO |
|--------------+---------------------------------------------|
| ! | Flash function initiated |
|--------------+---------------------------------------------|
| / | 125 ms delay before proceeding with dial |
| | string |
|--------------+---------------------------------------------|
| W | Dialing resumed following dial tone |
| | detection of second dial tone |
|--------------+---------------------------------------------|
| @ | Wait for quiet answer, then procedes to |
| | execute the rest of the dial string. |
|--------------+---------------------------------------------|
| R | Answer mode enabled; originate mode |
| | disabled following handshake initiation. |
|--------------+---------------------------------------------|
| # and * | Extended touch tone pad tones |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL - LAST NUMBER |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] DL [cmds] |
|--------------+---------------------------------------------|
| Description: | Re-dial last number dialed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL - STORED NUMBER |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] DSn [cmds] |
|--------------+---------------------------------------------|
| Description: | Dial stored number from memory location n |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISCONNECT BUFFER DELAY |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S38=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | Unidentified |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Sets maximum duration allowed during |
| | buffered data calls for modem to perform |
| | clearing functions after losing |
| | carrier-signal or receiving a clear call |
| | signal from the remote modem and before |
| | initiating hang-up process. A value of 0 |
| | will allow the modem to hanging-up after |
| | DTR drops. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DTR CHANGE THRESHOLD |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S25=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 20 |
|--------------+---------------------------------------------|
| Range: | Unidentified |
|--------------+---------------------------------------------|
| Unit: | .01 second |
|--------------+---------------------------------------------|
| Description: | Sets maximum time a change in the DTR |
| | signal will be ignored |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ECHO |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] En [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls echo function; display keyboard |
| | commands when enabled. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| E0 | Echo function disabled |
|--------------+---------------------------------------------|
| í 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 |
|--------------+---------------------------------------------|
| í F1 | Local echo disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ERROR CORRECTION MODE (ARQ) |
|------------------------------------------------------------|
| 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 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | ARQ result codes enabled and V.32 result |
| | code added |
|--------------+---------------------------------------------|
| í &A3 | Error control and compression result codes |
| | enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FACTORY DEFAULT PROFILE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Fn [cmds] |
|--------------+---------------------------------------------|
| Description: | Loads values in active profile to values |
| | found in the default profile, which are |
| | READ-ONLY. |
|------------------------------------------------------------|
| Command | Function |
|-------------------+----------------------------------------|
| &F0 | Generic template |
|-------------------+----------------------------------------|
| í &F1 | Hardware flow control template |
|-------------------+----------------------------------------|
| &F2 | Software flow control template |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL CHARACTER - XOFF |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S23=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 19 |
|--------------+---------------------------------------------|
| Range: | 0-127 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| 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: | ASCII |
|--------------+---------------------------------------------|
| Description: | Sets the character used to represent XON. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL PASSTHROUGH |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &In [cmds] |
|--------------+---------------------------------------------|
| Description: | Allows modem to act on, then transmit |
| | XON/XOFF characters. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &I0 | Software flow control disabled |
|--------------+---------------------------------------------|
| &I1 | XON/XOFF pass-through enabled |
|--------------+---------------------------------------------|
| &I2 | XON/XOFF pass-through disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL TYPE - RECEIVE DATA |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Rn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls receive data hardware flow control |
| | and RTS signals |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &R1 | Modem ignores RTS |
|--------------+---------------------------------------------|
| í &R2 | Received data to DTE when RTS is on |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL TYPE - TRANSMIT DATA |
|------------------------------------------------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| í &G0 | Guard tone disabled |
|--------------+---------------------------------------------|
| &G1 | 550Hz guard tone enabled |
|--------------+---------------------------------------------|
| &G2 | 1800Hz guard tone enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HELP SCREEN - CONTROLS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | <Ctrl> C, K or S |
|--------------+---------------------------------------------|
| Description: | Cancel or starts/restarts help screens |
|------------------------------------------------------------|
| Command | Function |
|------------------+-----------------------------------------|
| <Ctrl> C | Display of help screen canceled |
|------------------+-----------------------------------------|
| <Ctrl> K | Display of help screen canceled |
|------------------+-----------------------------------------|
| <Ctrl> S | Starts/restarts 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) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S19=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | Unidentified |
|--------------+---------------------------------------------|
| Unit: | 1 minute |
|--------------+---------------------------------------------|
| Description: | Sets the length of time that the modem does |
| | not receive information before it |
| | disconnects. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LIST AMPERSAND COMMANDS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &$ [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays ampersand (&) commands |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCK SERIAL PORT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Bn [cmds] |
|--------------+---------------------------------------------|
| Description: | Not used. Modem follows COM port speed if |
| | it changes, even while on-line. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ON-LINE |
|------------------------------------------------------------|
| Type: | Immediate |
|---------------+--------------------------------------------|
| Format: | AT [cmds] On [cmds] |
|---------------+--------------------------------------------|
| Description: | Controls on-line command (data |
| | transmission) mode options. |
|------------------------------------------------------------|
| Note: The O command must be placed at the end of the |
| command string. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| O0 | On-line command mode with no retraining |
| | enabled |
|---------------+--------------------------------------------|
| O1 | On-line command mode with retraining |
| | enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ON-LINE HELP |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $ [cmds] |
|--------------+---------------------------------------------|
| Description: | On-line help; displays basic command list |
+------------------------------------------------------------+
+------------------------------------------------------------+
| POWER-UP/HARD RESET CONFIGURATIONS |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Yn [cmds] |
|--------------+---------------------------------------------|
| Description: | On power-up modem uses default profiles |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í Y0 | Use default setting 0 saved in non-volatile |
| | RAM |
|--------------+---------------------------------------------|
| Y1 | Use default setting 1 saved in non-volatile |
| | RAM |
|--------------+---------------------------------------------|
| Y2 | Generic template |
|--------------+---------------------------------------------|
| Y3 | Hardware flow control template |
|--------------+---------------------------------------------|
| Y4 | Software flow control template |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| í &P0 | 39/61ms at 10pps (North America) |
|--------------+---------------------------------------------|
| &P1 | 33/67ms at 10pps (Europe) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPEAT COMMAND STRING |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] A> [cmds] |
|--------------+---------------------------------------------|
| Description: | Causes modem to repeat command string until |
| | a keyboard key is pressed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPEAT PREVIOUS COMMAND |
|------------------------------------------------------------|
| Type: | Immediate |
|---------------+--------------------------------------------|
| Format: | A/ |
|---------------+--------------------------------------------|
| Description: | Repeats previous command, mainly used for |
| | re-dial |
|------------------------------------------------------------|
| Note: Do not precede this command with AT, or follow |
| it with <CR>. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPORT INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information requested |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Reports 4-digit product code |
|--------------+---------------------------------------------|
| I1 | Reports DSP code checksum |
|--------------+---------------------------------------------|
| I2 | Reports RAM test |
|--------------+---------------------------------------------|
| I3 | Reports product type |
|--------------+---------------------------------------------|
| I4 | Reports current command settings |
|--------------+---------------------------------------------|
| I5 | Reports NVRAM settings |
|--------------+---------------------------------------------|
| I6 | Reports link diagnostics |
|--------------+---------------------------------------------|
| I7 | Reports product configuration |
|--------------+---------------------------------------------|
| I10 | VxD configuration |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| Q2 | Result code sending enabled while in |
| | originate mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| X0 | Busy and dial tone detection disabled; |
| | result codes 0-4 enabled. |
|--------------+---------------------------------------------|
| X1 | Busy and dial tone detection disabled; |
| | result codes 0-5, 10-155 enabled. |
|--------------+---------------------------------------------|
| X2 | Busy tone detection disabled, dial tone |
| | detection enabled; result codes 0-6, 10-155 |
| | enabled; also adaptive dialing, wait for |
| | second dial tone, and fast dialing enabled. |
|--------------+---------------------------------------------|
| X3 | Busy tone detection enabled, dial tone |
| | detection disabled; result codes 0-5, 7-155 |
| | enabled; also adaptive dialing, and wait |
| | for answer enabled. |
|--------------+---------------------------------------------|
| X4 | Busy and dial tone detection enabled; |
| | result codes 0-155 enabled; also adaptive |
| | dialing, wait for second dial tone, wait |
| | for answer, and fast dialing enabled. |
|------------------------------------------------------------|
| Note: Valid numeric result codes; 0-8, 10, 13, 18, 20, 21, |
| 25, 43, 85, 91, 99, 103, 107, 151, and 155. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SOFT RESET |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Zn [cmds] |
|--------------+---------------------------------------------|
| Description: | Restores modem profiles previously saved in |
| | non-volatile RAM |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| Z0 | Restore setting used by ATY command |
|--------------+---------------------------------------------|
| Z1 | Restore setting 0 |
|--------------+---------------------------------------------|
| Z2 | Restore setting 1 |
|--------------+---------------------------------------------|
| Z3 | Restore factory setting 0 (AT&F0) |
|--------------+---------------------------------------------|
| Z4 | Restore factory setting 1 (AT&F1) |
|--------------+---------------------------------------------|
| Z5 | Restore factory setting 2 (AT&F2) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| M3 | Speaker enabled following dialing, then |
| | disabled after carrier signal detected. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SPEAKER VOLUME |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Ln [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls speaker volume |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| L0 | Low volume setting |
|--------------+---------------------------------------------|
| L1 | Low volume setting |
|--------------+---------------------------------------------|
| í L2 | Medium volume setting |
|--------------+---------------------------------------------|
| L3 | Highest volume setting |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------------------------------------------------|
| Note: See the section on S-registers for detailed |
| listing of commonly used S-registers. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| Sn.b=x | Write to register bit b using values 0 |
| | (off) and 1 (on) for x |
+------------------------------------------------------------+
+------------------------------------------------------------+
| STORE ACTIVE PROFILE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Wn [cmds] |
|--------------+---------------------------------------------|
| Description: | Writes the values for the active profile |
| | into the non-volatile RAM templates |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &W0 | Write the active profile to stored profile |
| | 0 |
|--------------+---------------------------------------------|
| &W1 | Write the active profile to stored profile |
| | 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| STORE TELEPHONE NUMBER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Zn=x |
|--------------+---------------------------------------------|
| Description: | Writes selected telephone numbers into the |
| | non-volatile memory at location n |
|------------------------------------------------------------|
| Note: The characters described in the D command are |
| valid for use in the &Z command. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| &Zn=L | Writes last executed dial string into the |
| | non-volatile memory at location n |
|---------------+--------------------------------------------|
| &Zn? | Displays phone number from non-volatile |
| | memory at location n |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TEST MODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Tn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls loopback tests, analog, digital, |
| | remote digital, and self tests. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| &T0 | Testing disabled |
|---------------+--------------------------------------------|
| &T1 | Local analog loopback enabled |
|---------------+--------------------------------------------|
| &T3 | Local digital loopback enabled |
|---------------+--------------------------------------------|
| &T4 | Remote digital loopback enabled |
|---------------+--------------------------------------------|
| í &T5 | Remote digital loopback prohibited |
|---------------+--------------------------------------------|
| &T6 | Remote digital loopback initiated |
|---------------+--------------------------------------------|
| &T7 | Remote digital loopback w/ self-test and |
| | error detector in progress |
|---------------+--------------------------------------------|
| &T8 | Local analog loopback w/ self-test and |
| | error detector in progress |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TEST TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S18=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Sets the maximum duration for modem tests |
|------------------------------------------------------------|
| Note: S18=0 disables the timer and allows an |
| indefinite duration. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE DIALING TEST |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S16=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the tone dialing test |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í S16=0 | Tone dialing test disabled |
|--------------+---------------------------------------------|
| S16=2 | Tone dialing test enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.21 - ANSWER MODE FALLBACK TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S29=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 20 |
|--------------+---------------------------------------------|
| Range: | Unidentified |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | Sets the length of time for V.21 answer |
| | mode fallback |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------------------------------------------------|
| Value | Meaning |
|---------------+--------------------------------------------|
| 0 | V.32 answer tones disabled |
|---------------+--------------------------------------------|
| 255 | V.32 at 9600 enabled, all other |
| | connections disabled. |
+------------------------------------------------------------+