Multi-Tech Systems GPRS (MTMMC-G) ユーザーズマニュアル
Chapter 11 – Data Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I)
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Select Data Compression %C
Description:
This command enables or disables data compression negotiation if this feature is supported on the
product.
product.
Values: <n>
0
no compression (default)
2
V42bis compression if supported
Syntax: Command
syntax:
AT%C<n>
Command
Possible responses
AT%C0
Note: Command
Note: Command
OK
Note: Feature supported
Note: Feature supported
AT%C2
Note: Command
Note: Command
OK
Note: V42bis supported
Note: V42bis supported
AT%C?
Note: Current value
Note: Current value
2
OK
Note: Command valid
OK
Note: Command valid
V42bis Data Compression +DS
Description:
This command enables or disables V.42bis data compression if this feature is supported on the product.
Note that the product allows only the MNP2 protocol.
Note that the product allows only the MNP2 protocol.
Values:
< dir > Specifies the desired direction(s) of operation of the data compression function; from the
DTE point of view, (default is 3)
0 Negotiated … no compression
1 Transmit only
2 Receive only
3 Both directions, accept any direction. Default.
1 Transmit only
2 Receive only
3 Both directions, accept any direction. Default.
< neg > Specifies whether or not the DCE should continue to operate if the desired result is not
obtained, (default is 0)
0 Do not disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>.
0 Do not disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>.
Default.
1
Disconnect if V.42 bis is not negotiated by the remote DCE as specified in <dir>
<
P1 > Specifies the maximum number of dictionary entries that should be negotiated,
Range is 512 to 2048. Default is 2048.
< P2 > Specifies the maximum string length to be negotiated. Range is 6 to 250. Default is 20.
Syntax: Command
syntax:
AT+DS=[[<dir>][,[<neg>][,[<P1>][,[<P2>]]]]
Command
Possible responses
AT+DS=?
Note: Test command
Note: Test command
+DS: (0-3),(0,1),(512-2048),(6-250)
OK
OK
AT+DS=3,0,2048,250
Note: Set new parameters
Note: Set new parameters
OK
Note: Command valid
Note: Command valid
AT+DS?
Note: Current values
Note: Current values
+DS: 3,0,2048,20
OK
Note: Command valid
OK
Note: Command valid