Multi-Tech Systems MMCModem GPRS (MTMMC-G) - Manual (Page 96)

Chapter 11 – Data Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 96
Radio Link Protocol Parameters +CRLP
Description: This command changes the radio link protocol parameters used for non transparent data transmission.
Values: Value: Range: Description:
<iws> 0-61 Down window size, (default is 61)
<mws> 0-61 Up window size, (default is 61)
<T1> 40-255 Acknowledgement timer in units of 10ms, (default is 48)
<N2> 1-255 Retransmission attempts, (default is 6)
<ver> 0-1 Version number
0 V42bis is not supported
1 V42bis is supported
Syntax: Command syntax: AT+CRLP=<iws>,<mws>,<T1>,<N2>, <ver>
Command Possible responses
AT+CRLP=?
Note: Test command +CRLP: (0-61),(0-61),(40-255),(1,255),(0)
OK
Note: V42bis not supported
AT+CRLP=?
Note: Test command +CRLP: (0-61),(0-61),(40-255),(1,255),(0,1)
OK
Note: V42bis supported
AT+CRLP=61,61,48,6,0
Note: Set new parameters OK
Note: Command valid
AT+CRLP?
Note: Current values AT+CRLP: 61,61,48,6,0
Note: Command valid
Other Radio Link Parameters +DOPT
Description: This command modifies some supplementary radio link protocol parameters.
Values: <reset_allowed>
0 Data communication is hung up in case of bad radio link.
1 Default. Data communication continues in case of bad radio link (possible loss of data )
<dtx_allowed>
0 Normal mode
1 Default. Economic battery mode (not supported by all networks)
Syntax: Command syntax: AT+DOPT=<reset_allowed>,<dtx_allowed>
Command Possible responses
AT+DOPT=1
Note: Set new parameters (2
nd value is the default)
OK
Note: Command valid
AT+DOPT+?
Note: Test command (0,1),(0,1)
OK
Note: DTX is supported
AT+DOPT=1,1
Note: Set new parameters OK
Note: Command valid
AT+DOPT?
Note: Current values 1,1
OK
Note: Command valid