User's Manual

ST-100M Module
21
2.28 AT+DS
2.28.1 Description
Controls the V.42 bis data compression function, if provided in the TA.
2.28.2 Format
Execution command : AT+DS=[<direction>[,<compression_negotiation>[,<max_dict>[,<max-string>]]]]
Read command : AT+DS? Displays the current <direction>, <compression_negotiation>,
<max_dict>, and <max_string> settings.
Test command : AT+DS=? Shows if the command is supported.
2.28.3 Field
Type Short name Parameter/comment
Integer direction
0 Disable V.42bis
1 Enable V.42bis in transmit direction only
2 Enable V.42bis in receive direction only
3 Enable V.42bis compression in both
directions Default setting
Integer
Compression_
negotiation
0 Accept connection if compression is
negotiated according to direction Default
setting
1 Disconnect if compression is not
negotiated according to direction
Integer max_dict
512 to 4096 Maximum dictionary size
1024 Default setting
Integer max_string
6 to 250 Maximum string length
32 Default setting
2.28.4 Response
Execution command : OK
Read command : +DS: <direction>,<compression_negotiation>,<max-dict>,<max_string>
Test command : +DS: (list of supported <direction>s),(list of supported
<compression_negotiation>s),(list of supported <max_dict>s),(list of supported
<max_string>s)
2.29 AT+GCAP
2.29.1 Description
Request complete capabilities list.