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Chapter 4 - AT Commands, S-Registers, Result Codes
24
MultiModemDID User Guide
Command: +DR=
n
V.44 Data Compression Reporting
Values:
n
= 0 or 1
Default: 0
Description: Enables or disables the V.44 data compression report. If the
compression report is enabled, the +DR:<
type
> intermediate
result code reports the current DCE-DCE data compression type.
It is issued after the Error Control Report (+ER) and before the
final result code (e.g.,
CONNECT
). The intermediate result
code descriptions are shown after the command descriptions.
+DR=0 Disables the V.44 compression report.
+DR=1 Enables the V.44 compression report.
+DR=? Displays the allowed values.
+DR? Displays the current value.
+DR: NONE Data compression not in use.
+DR: V42B V.42bis is in use in both directions.
+DR: V44 V.44 is in use in both directions.
Command: +DS44=
n
V.44 Data Compression
Values: See description
Default: See description
Description: Controls the V.44 data compression function.
The command syntax is +DS44=[
direction
][,[0][,[0]
[,[
max_codewords_tx
][,[
max_codewords_rx
][,[
max_string_tx
]
[,[
max_string_rx
][,[
max_history_tx
][,[
max_history_rx
]]]]]]]]]<CR>
Subparameters that are not entered retain their current value.
Commas separate optional subparameters, and must be inserted
to skip a subparameter. Example: +DS44=,,,2048,2048<CR>
changes the maximum number of code words in both
directions, and keeps all other settings at their current values.
+DS44=? Reports supported options in the format (list of supported
direction
values), (0), (0), (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). Example:
+DS44: (3, 0), (0),
(0), (256-2048), (256-2048), (31-255), (31-255), (512-11008),
(512-11008).
+DS44? Reports current options in the following format:
direction
, 0, 0,
max_codewords_tx
,
max_codewords_rx
,
max_string_tx
,
max_string_rx
,
max_history_tx
,
max_history_rx.
Example:
+DS44: 3, 0, 0, 1024, 1024, 255, 255, 5120, 4096.