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# E-TECH RESEARCH, INC.
C288MX PCMCIA
Card Type Modem (asynchronous)
Chipset Unidentified
Maximum Data Rate 28.8Kbps
Maximum Fax Rate 14.4Kbps
Data Bus PCMCIA Type II
Fax Class Class I & II
Data Modulation Bell 103A/212A
ITU-T V.21, V.22, V.22bis, V.32,
V.32bis, V.34
AT&T V.32terbo
Fax Modulation ITU-T V.17, V.21CH2, V.27ter, V.29
Error MNP5, V.42, V.42bis
Correction/Compression
53134
+------------------------------------------------------------+
| SUPPORTED STANDARD COMMANDS |
|------------------------------------------------------------|
| Basic AT Commands |
|------------------------------------------------------------|
| +++, ‘comma’, A/ |
|------------------------------------------------------------|
| A, B, D, E, H, L, M, N, P, Q, T, V, W, X, Y, Z |
|------------------------------------------------------------|
| &C, &D, &F, &G, &K, &L, &R, &S, &T, &V, &W, &Y, &Z |
|------------------------------------------------------------|
| Extended AT Commands |
|------------------------------------------------------------|
| \A, \B, \C, \G, \J, \K, \N, \Q, \T, \V, \X |
|------------------------------------------------------------|
| %A, %C, %G |
|------------------------------------------------------------|
| Special AT Commands |
|------------------------------------------------------------|
| "H, -J, "N, "O |
|------------------------------------------------------------|
| S-Registers |
|------------------------------------------------------------|
| S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, |
| S18, S22, S25, S26, S27, S30 |
|------------------------------------------------------------|
| Note: See MHI documentation for complete information. |
| |
| The functions of the O command and the S42 and S47 |
| registers are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| UNIDENTIFIED COMMANDS |
|------------------------------------------------------------|
| Command | Default |
|-----------------------------+------------------------------|
| O | N/A |
|-----------------------------+------------------------------|
| S42 | Read-only |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| AUTO-RELIABLE FALLBACK CHARACTER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S43=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Read-only |
|--------------+---------------------------------------------|
| Range: | 0-127 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| Description: | Displays the ASCII value character used as |
| | the auto-reliable fallback character. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUTO-RELIABLE TIME BUFFER CONFIGURATION |
|------------------------------------------------------------|
| Type: | Register (read-only) |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S48? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information regarding the handling |
| | of incoming data during auto-reliable time |
| | period. |
|--------------+---------------------------------------------|
| Value | Meaning |
|--------------+---------------------------------------------|
| 0 | Data is discarded. |
|--------------+---------------------------------------------|
| 1 | Data is buffered for 4 seconds or 200 |
| | characters. |
|--------------+---------------------------------------------|
| 2 | Data is discarded; modem returns to normal |
| | mode on receiving auto-reliable fallback |
| | character. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S44 |
|------------------------------------------------------------|
| Format: | AT [cmds] S44=n [cmds] |
|-----------------+------------------------------------------|
| Default: | 6 |
|-----------------+------------------------------------------|
| Range: | 0 - 23 |
|-----------------+------------------------------------------|
| Description: | Controls V.42bis and |
| | auto-fallback/fall-forward. |
|------------------------------------------------------------|
| Bit | Value | Function |
|----------+-------+-----------------------------------------|
| 0 | í 0 | V.42bis enabled. |
| | | |
| | 1 | V.42bis disabled. |
|------------------------------------------------------------|
| 2, 1 | 00 | V.42bis disabled. |
| | | |
| | 01 | V.42bis enabled on transmit only. |
| | | |
| | 10 | V.42bis enabled on receive only. |
| | | |
| | í | V.42bis enabled. |
| | 11 | |
|--------------+----+----------------------------------------|
| 3 | 0 | Not used. |
|--------------+----+----------------------------------------|
| 4 | í | Auto-fallback/fall-forward disabled. |
| | 0 | |
| | | Auto-fallback/fall-forward enabled. |
| | 1 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S51 |
|------------------------------------------------------------|
| Format: | AT [cmds] S51? [cmds] |
|----------------+-------------------------------------------|
| Default: | Read-only |
|----------------+-------------------------------------------|
| Range: | 0 - 115 |
|----------------+-------------------------------------------|
| Description: | Controls flow control, serial port speed, |
| | and XON/XOFF trapping. |
|------------------------------------------------------------|
| Bit | Value | Function |
|----------+-------+-----------------------------------------|
| 1, 0 | 00 | Flow control disabled. |
| | | |
| | 01 | Bidirectional XON/XOFF flow control |
| | | enabled. |
| | 10 | |
| | | CTS flow control by DCE enabled. |
| | 11 | |
| | | Bidirectional RTS/CTS flow control |
| | | enabled. |
|------------------------------------------------------------|
| 3, 2 | 00 | Not used. |
|-------------+-----+----------------------------------------|
| 4 | 0 | Modem-to-modem flow control disabled. |
| | | |
| | 1 | Modem-to-modem flow control enabled. |
|-------------+-----+----------------------------------------|
| 5 | 0 | Serial port speed locked. |
| | | |
| | 1 | Serial port speed follows connect |
| | | speed. |
|-------------+-----+----------------------------------------|
| 6 | 0 | XON/XOFF signals trapped by local |
| | | modem. |
| | 1 | |
| | | XON/XOFF passed through local modem. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S54 |
|------------------------------------------------------------|
| Format: | AT [cmds] S54=n [cmds] |
|--------------------+---------------------------------------|
| Default: | Unidentified |
|--------------------+---------------------------------------|
| Range: | Unidentified |
|--------------------+---------------------------------------|
| Description: | Controls extended result codes. |
|------------------------------------------------------------|
| Bit | Value | Function |
|-----------+----------+-------------------------------------|
| 1 - 0 | N/A | This function is unidentified. |
|------------------------------------------------------------|
| 6 - 2 | 00000 | Not used. |
|---------------+-------+------------------------------------|
| 7 | 0 | Error correction and compression |
| | | extended result codes disabled. |
| | 1 | |
| | | Error correction extended result |
| | | codes enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK TYPE |
|------------------------------------------------------------|
| Type: | Register (read-only) |
|--------------------+---------------------------------------|
| Format: | AT [cmds] S52? [cmds] |
|--------------------+---------------------------------------|
| Description: | Returns a number indicating the |
| | modem’s action on a break signal. |
|------------------------------------------------------------|
| Value | Break from | Modem receives | Break received |
| | DTE | \B | from remote |
| | | | modem |
|-----------+--------------+----------------+----------------|
| 0 | Online | Break sent to | Buffers |
| | command mode | remote modem | cleared, break |
| | enabled, | and buffered | sent to DTE. |
| | send no | cleared. | |
| | break to | | |
| | remote | | |
| | modem. | | |
|-----------+--------------+----------------+----------------|
| 1 | Break sent | Break sent to | Buffers |
| | to remote | remote modem | cleared, break |
| | modem and | and buffered | sent to DTE. |
| | buffered | cleared. | |
| | cleared. | | |
|-----------+--------------+----------------+----------------|
| 2 | Online | Send break to | Break sent |
| | command mode | remote modem | immediately to |
| | enabled, | immediately. | DTE. |
| | send no | | |
| | break to | | |
| | remote | | |
| | modem. | | |
|-----------+--------------+----------------+----------------|
| 3 | Send break | Send break to | Break sent |
| | to remote | remote modem | immediately to |
| | modem | immediately. | DTE. |
| | immediately. | | |
|-----------+--------------+----------------+----------------|
| 4 | Online | Send break | Break sent |
| | command mode | with | with received |
| | enabled, | transmitted | data to the |
| | send no | data. | DTE. |
| | break to | | |
| | remote | | |
| | modem. | | |
|-----------+--------------+----------------+----------------|
| 5 | Send break | Send break | Break sent |
| | with | with | with received |
| | transmitted | transmitted | data to the |
| | data. | data. | DTE. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECT MODE |
|------------------------------------------------------------|
| Type: | Register, read-only |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S53? [cmds] |
|--------------+---------------------------------------------|
| Description: | Returns a value indicating the type of |
| | connection the modem will make. |
|--------------+---------------------------------------------|
| Value | Meaning |
|--------------+---------------------------------------------|
| 0 | Normal mode enabled |
|--------------+---------------------------------------------|
| 1 | Direct mode enabled |
|--------------+---------------------------------------------|
| 2 | MNP reliable mode enabled |
|--------------+---------------------------------------------|
| 3 | Auto-reliable mode or MNP auto-reliable |
| | mode enabled |
|--------------+---------------------------------------------|
| 4 | V.42 auto-reliable mode or MNP |
| | auto-reliable mode enabled |
|--------------+---------------------------------------------|
| 5 | V.42 reliable mode enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information requested about the |
| | modem. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Displays product identification code. |
|--------------+---------------------------------------------|
| I1 | Displays country code. |
|--------------+---------------------------------------------|
| I2 | Displays OEM string. |
|--------------+---------------------------------------------|
| I4 | Displays EPROM type. |
|--------------+---------------------------------------------|
| I5 | Displays DSP chip version. |
|--------------+---------------------------------------------|
| I9 | Displays flash ROM checksum. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RESULT CODES |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S41? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays selection of which extended result |
| | codes will be displayed. |
|--------------+---------------------------------------------|
| Value | Meaning |
|--------------+---------------------------------------------|
| 0 | Enables CONNECT result codes to report DTE |
| | speed. If S95=0, then all extended |
| | connection result codes are disabled. |
|--------------+---------------------------------------------|
| 1 | Enables CONNECT result codes to report DTE |
| | speed. If S95=0, then all CARRIER and |
| | PROTOCOL extended result codes are enabled. |
|--------------+---------------------------------------------|
| 2 | Enables CONNECT result codes to report DCE |
| | speed. If S95=0, then all extended result |
| | codes are disabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HDLC ADDRESS |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S20=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 ASCII character |
|--------------+---------------------------------------------|
| Description: | Sets the HDLC address and BSC character. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LINE SPEED |
|------------------------------------------------------------|
| Type: | Register (read-only) |
|--------------+---------------------------------------------|
| Format | AT [cmds] S37? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the maximum allowable data |
| | exchange rate attempted during handshake |
| | process. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í S37=0 | Speed of last command. |
|--------------+---------------------------------------------|
| S37=3 | Connect at 300bps. |
|--------------+---------------------------------------------|
| S37=5 | Connect at 1200bps. |
|--------------+---------------------------------------------|
| S37=6 | Connect at 2400bps. |
|--------------+---------------------------------------------|
| S37=7 | Connect at 4800bps. |
|--------------+---------------------------------------------|
| S37=8 | Connect at 7200bps. |
|--------------+---------------------------------------------|
| S37=9 | Connect at 9600bps. |
|--------------+---------------------------------------------|
| S37=10 | Connect at 12Kbps. |
|--------------+---------------------------------------------|
| S37=11 | Connect at 14.4Kbps. |
|--------------+---------------------------------------------|
| S37=12 | Connect at 16.8Kbps. |
|--------------+---------------------------------------------|
| S37=13 | Connect at 19.2Kbps. |
|--------------+---------------------------------------------|
| S37=14 | Connect at 21.6Kbps. |
|--------------+---------------------------------------------|
| S37=15 | Connect at 24Kbps. |
|--------------+---------------------------------------------|
| S37=16 | Connect at 26.4Kbps. |
|--------------+---------------------------------------------|
| S37=17 | Connect at 28.8Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LOCAL SERIAL PORT SPEED |
|------------------------------------------------------------|
| Type: | Register (read-only) |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S62? [cmds] |
|--------------+---------------------------------------------|
| Description: | Returns a value indicating the speed of the |
| | local serial port. |
|------------------------------------------------------------|
| Value | Meaning |
|------------------+-----------------------------------------|
| 0 | Serial port speed set to 300bps. |
|------------------+-----------------------------------------|
| 1 | Serial port speed set to 600bps. |
|------------------+-----------------------------------------|
| 2 | Serial port speed set to 1200bps. |
|------------------+-----------------------------------------|
| 3 | Serial port speed set to 2400bps. |
|------------------+-----------------------------------------|
| 4 | Serial port speed set to 4800bps. |
|------------------+-----------------------------------------|
| 5 | Serial port speed set to 7200bps. |
|------------------+-----------------------------------------|
| 6 | Serial port speed set to 9600bps. |
|------------------+-----------------------------------------|
| 7 | Serial port speed set to 12Kbps. |
|------------------+-----------------------------------------|
| 8 | Serial port speed set to 14.4Kbps. |
|------------------+-----------------------------------------|
| 9 | Serial port speed set to 16.8Kbps. |
|------------------+-----------------------------------------|
| 10 | Serial port speed set to 19.2Kbps. |
|------------------+-----------------------------------------|
| 11 | Serial port speed set to 21.6Kbps. |
|------------------+-----------------------------------------|
| 12 | Serial port speed set to 24Kbps. |
|------------------+-----------------------------------------|
| 13 | Serial port speed set to 26.4Kbps. |
|------------------+-----------------------------------------|
| 14 | Serial port speed set to 28.8Kbps. |
|------------------+-----------------------------------------|
| 15 | Serial port speed set to 38.4Kbps. |
|------------------+-----------------------------------------|
| 16 | Serial port speed set to 57.6Kbps. |
|------------------+-----------------------------------------|
| 17 | Serial port speed set to 115.2Kbps. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MAXIMUM BLOCK SIZE FOR TRANSMISSION |
|------------------------------------------------------------|
| Type: | Register (read-only) |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S49? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the maximum transmittable block |
| | size in MNP mode. |
|--------------+---------------------------------------------|
| Value | Meaning |
|--------------+---------------------------------------------|
| 0 | MNP block size is 64 characters |
|--------------+---------------------------------------------|
| 1 | MNP block size is 128 characters |
|--------------+---------------------------------------------|
| 2 | MNP block size is 192 characters |
|--------------+---------------------------------------------|
| 3 | MNP block size is 256 characters |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP MODE |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S59=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls MNP mode. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| S59=0 | MNP5 compression disabled. |
|---------------+--------------------------------------------|
| í S59=1 | MNP5 compression enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MODE OF OPERATION |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S50? [cmds] |
|--------------+---------------------------------------------|
| Description: | Returns a value indicating the modem’s |
| | current operating mode. |
|------------------------------------------------------------|
| Value | Meaning |
|----------------------+-------------------------------------|
| 0 | Modem is in data mode. |
|----------------------+-------------------------------------|
| 1 | Modem is in fax mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ROUND TRIP DELAY |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S65=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Read-only |
|--------------+---------------------------------------------|
| Range: | Unidentified |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | The function of this register is |
| | unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SLEEP TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S46=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 255 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | Maximum duration of DTE and DCE inactivity |
| | allowed prior to initiating low-power sleep |
| | mode. Setting S46 to 255 disables this |
| | feature. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SLEEP TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S47=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 255 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | Unidentified |
|--------------+---------------------------------------------|
| Description: | Maximum duration of DTE and DCE inactivity |
| | allowed prior to initiating power-down |
| | sleep mode. Setting S47 to 255 disables |
| | this feature. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.42bis DICTIONARY SIZE |
|------------------------------------------------------------|
| Type: | Register (read-only) |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S57? [cmds] |
|--------------+---------------------------------------------|
| Description: | Returns a value indicating the V.42bis |
| | dictionary size. |
|--------------+---------------------------------------------|
| Value | Meaning |
|--------------+---------------------------------------------|
| 0 | 512 byte dictionary selected. |
|--------------+---------------------------------------------|
| 1 | 1024 byte dictionary selected. |
|--------------+---------------------------------------------|
| 2 | 1536 byte dictionary selected. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.42bis MAXIMUM STRING LENGTH |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S58=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 32 |
|--------------+---------------------------------------------|
| Range: | 6-64 |
|--------------+---------------------------------------------|
| Unit: | 1 ASCII character |
|--------------+---------------------------------------------|
| Description: | Sets the maximum string size for V.42bis |
| | compression. |