Multi-Tech Systems GPRS (MTMMC-G) 사용자 설명서

Chapter 11 – Data Commands

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I)

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

V42bis is not supported

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>

Data communication is hung up in case of bad radio link.

Default. Data communication continues in case of bad radio link (possible loss of data

)

<dtx_allowed>

0 Normal

mode

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

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