Control Microsystems 5901 - Dr=N - Data Compression Reporting

5901 High Speed Dialup Modem Hardware Manual
October 19, 2007
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Command: +DS=?
Response: +DS: (a range),(b range),(c range),(d range)
Example: +DS: (0,3),(0),(2048),(32)
10.4.4 +DR=n - 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).
Command: +DR=[n]
n 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: n
Example: +DR: 1 For the default setting.
Reporting Supported Range of Parameter Values
Command: +DR=?
Response: +DR: (n range)
Example: +DR: (0,1)
+DR: n Intermediate Result Code
The +DR: n reported represents the current (negotiated or renegotiated) modem-modem data
compression type. If enabled, the intermediate result code is transmitted at the point after error
control negotiation (handshaking) at which the modem has determined which data compression
technique will be used (if any) and the direction of operation. The +DR intermediate result code, if
enabled, is issued after the Error Control Report (+ER) and before the final result code (e.g.,
CONNECT).
Result Code: +DR: n
n An alphanumeric code corresponding to the selected option:
NONE Data compression is not in use.
V42B V.42bis is in use in both directions.
ALT MNP 5 compression.