Reporting current or selected values, Reporting supported range of parameter values, Dr - data compression reporting – Comtrol AT Commands User Manual
Page 101: Syntax, Defined values

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
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Reporting Current or Selected Values
Command: +DS44?
Response: +DS44:<direction>,<compression_negotiation>,<capability>,
<max_codewords_tx>,<max_codewords_rx>,<max_string_tx>,
<max_string_rx>,<max_history_tx>,<max_history_rx>
Example:
+DS44:3,0,0,2048,2048,32,32,4096,4096
For the default setting.
Reporting Supported Range of Parameter Values
Command: +DS44=?
Response: +DS44:(list of supported <direction> values),(list of supported
<compression_negotiation> values),(list of supported <capability>
values),(list of supported <max_codewords_tx> values),(list of supported
<max_codewords_rx> values),(list of supported <max_string_tx>
values),(list of supported <max_string_rx> values),(list of supported
<max_history_tx> values),(list of supported <max_history_rx> values)
+DR - Data Compression Reporting
This extended-format numeric parameter controls whether or not the extended-format
+DR: intermediate result code is transmitted from the modem to the DTE.
S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more recent setting of
+DR or S95 bit 5, and the W command setting, determines the actual data compression
result code reporting (see S95 Parameter and W Command).
Syntax
+DR=[<value>]
Defined Values
<value>
decimal number corresponding to the selected option:
0
Data compression reporting disabled (no +DR
result code transmitted).
1
Data compression reporting enabled (+DR result
code transmitted). (Default.)
Reporting Current or Selected Values
Command: +DR?
Response: +DR:
<current
value>
Example:
+DR: 1
For the default setting.