Telenetics 56 - Manual (Page 96)

AT Commands
Page 88
+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 Value
<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.
Reporting Supported Range of Parameter Values
Command: +DR?
Response:
+DR: (<value> range)
Example: +DR: (0,1)
+DR: <type> Intermediate Result Code
The +DR: <type> 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). The format of this
result code is:
Result Code
Syntax +DR: <type>
Defined Value
<type> An alphanumeric code corresponding to the selected option:
NONE Data compression is not in use.
V42B V.42bis is in use in both directions.
V42B RD V.42bis is in use in receive direction only
V42B TD V.42bis is in use in transmit direction only
V44 V.44 is in use in both directions
V44 RD V.44 is in use in receive direction only
V44 TD V.44 is in use in transmit direction only
ALT MNP 5 compression.
Example
+DR:
V42B