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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 transmit
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 maximum
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 receive direction.
(Default = 4096.)
Report Commands: +DS44? Reports Current or Selected Values.
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.
+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 command
setting, determines the actual data compression result code reporting (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 Values.
Response: +DR: <current value>
Example: +DR: 1 For the default setting.
+DR=? Reports Supported Range of Parameter Values.
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 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).