Multi-Tech Systems Command: +DR Data Compression Reporting

Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 61
<max_codewords_tx> Decimal number 256 to 2048 that specifies the
maximum number of codewords which should be negotiated in the transm it
direction. (Default = 2048.)
<max_codewords_rx> Decimal number 256 to 2048 that specifies the
maximum number of codewords which should be negotiated in the receive
direction. (Default = 2048.)
<max_string_tx> Decimal number 32 to 255 that specifies the maximu m
string length to be negotiated in the transmit direction. (Default = 32.)
<max_string_rx> Decimal number 32 to 255 that specifies the maximum
string length to be negotiated in the receive direction. (Default = 32.)
<max_history_tx> Decimal number 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the transmit
direction. (Default = 4096.)
<max_history_rx> Decimal number 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the receiv e direction.
(Default = 4096.)
Report Commands: +DS44? Reports Current or Selected Values.
Response:
+DS44:<direction>,<compression_negotiation>,<capabilit y>,
<max_codewords_tx>,<max_codewords_rx>,<max_string_t x>,
<max_string_rx>,<max_history_tx>,<max_history_rx>
Example: +DS44:3,0,0,2048,2048,32,32,4096,4096 For the
default setting.
+DS44=? Reports Supported Range of Parameter Values.
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)
Command: +DR Data Compression Reporting
Description: 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 comman d
setting, determines the actual data compression result code re porting (see
S95 Parameter and W Command).
Defined Values: +DR0 Data compression reporting disabled (no +DR result code
transmitted).
+DR1 Data compression reporting enabled (+DR result code
transmitted). (Default.)
Report Commands: +DR? Reports Current or Selected Valu es.
Response: +DR: <current value>
Example: +DR: 1 For the default setting.
+DR=? Reports Supported Range of Parameter Va lues.
Response: +DR: (<value> range)
Example: +DR: (0,1)
Intermediate Result Code: +DR: <type>
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 contr ol
negotiation (handshaking) at which the modem has determined which dat a
compression technique will be used (if any) and the directio n 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).