Chapter 1 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
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+DS44
V.44 Data Compression
Description:
Controls the V.44 data compression function.
Syntax: AT+DS44=<direction>,<compression_negotiation>,<compatibility>,
<max_codewords_tx>, <max_codewords_rx>,<max_string_tx>,
<max_string_rx>,<max_history_tx>,<max_history_rx>
<direction> Values: Specifies the DTE direction of the data compression.
0
No compression.
3
Compression in both directions (default).
<max_codewords_tx> Values:
Specifies the maximum number of code words to be negotiated in the transmit
direction.
1024 Default.
256–2048 Maximum number of code words in transmit direction.
max_codewords_rx Values:
Specifies the maximum number of code words to be negotiated in the receive
direction.
1024 Default.
256–2048 Maximum number of code words in receive direction.
max_string_tx Values:
Specifies the maximum string length to be negotiated in the transmit direction.
255 Default.
31–255 Maximum string length in transmit direction.
max_string_rx Values:
Specifies the maximum string length to be negotiated in the receive direction.
255 Default.
31–255 Maximum string length in receive direction.
max_history_tx Values:
Specifies the maximum length of the history buffer to be negotiated in the transmit
direction.
5120 Default.
512–11008 History buffer size in transmit direction.
max_history_rx Values:
Specifies the maximum length of the history buffer to be negotiated in the receive
direction.
4096 Default.
512–11008 History buffer size in receive direction
Reports:
+DS44=? Reports supported options.
Example: +DS44: (3, 0), (0), (0), (256-2048), (256-2048), (31-255), (31-255),
(512-11008), (512-11008).
+DS44? Reports current or selected options.
Example: +DS44: 3, 0, 0, 1024, 1024, 255, 255, 5120, 4096.
Result Codes:
OK
ERROR
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