Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 79 23.06.2010
3.2.33 AT+CRLP Select Radio Link Protocol Parameters
AT+CRLP Select Radio Link Protocol Parameters
Response
TA returns values supported. RLP versions 0 and 1 share the same
parameter set. TA returns only one line for this set (where <verx> is not
present).
+CRLP: (list of supported <iws>s), (list of supported <mws>s), (list of
supported <T1>s), (list of supported <N2>s), (list of supported <ver1>s),
(list of supported <T4>s)
OK
Test Command
AT+CRLP=?
Parameters
see Write Command
Response
TA returns current settings for RLP version. RLP versions 0 and 1 share
the same parameter set. TA returns only one line for this set (where
<verx> is not present).
+CRLP: <iws>,<mws>,<T1>,<N2>,<ver1>,<T4>
OK
Read Command
AT+CRLP?
Parameters
see Write Command
Response
TA sets radio link protocol (RLP) parameters used when non-transparent
data calls are setup.
OK
Write Command
AT+CRLP=<iws
>[,<mws>[,<T1>[
,<N2>[,<ver>[,<T
4>]]]]]
Parameters
<iws> 0-61 Interworking window size (IWF to MS)
<mws> 0-61 Mobile window size(MS to IWF)
<T1> 44-255 acknowledgment timer T1 in 10 ms units
<N2> 1-255 retransmission attempts N2
<verx> 0 RLP version number
<T4> 7 re-sequencing period in integer format, in units of 10
ms.
Reference
GSM 07.07 [13]
Note
3.2.34 AT+CRSM Restricted SIM Access
AT+CRSM Restricted SIM Access