SimCom SIM7500 Series At Command Manual page 114

Write command controls whether or not intermediate result code "+CR: <serv>" is returned from
the TA to the TE. If enabled, the intermediate result code is transmitted at the point during connect
negotiation at which the TA has determined which speed and quality of service will be used, before
any error control or data compression reports are transmitted, and before the intermediate result
code CONNECT is transmitted.
SIM PIN References
YES 3GPP TS 27.007
Syntax
Test Command
AT+CR=?
Read Command
AT+CR?
Write Command
AT+CR=<mode>
Execution Command
AT+CR
Defined values
<mode>
0 – disables reporting
1 – enables reporting
<serv>
ASYNC
SYNC
REL ASYNC
REL sync
GPRS [<L2P>]
The optional <L2P> proposes a layer 2 protocol to use between the MT and the TE.
Examples
AT+CR?
+CR:0
OK
AT+CR=1
OK
SIM7500_SIM7600 Series_AT Command Manual_V1.07
Responses
+CR: (list of supported <mode>s)
OK
Responses
+CR: <mode>
OK
Responses
OK
Responses
Set default value:
OK
asynchronous transparent
synchronous transparent
asynchronous non-transparent
synchronous non-transparent
GPRS
Smart Machine Smart Decision
113 2017-12-25