Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 472)

SIM Commands
Generic SIM Access +CSIM
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
18.3 Generic SIM Access +CSIM
18.3.1 Description
This command allows direct control of the SIM by a distant application on the TE.
The <command> is sent without any modification to the SIM. In the same manner
the SIM <response> is sent back by the ME unchanged.
The user must then pay attention to processing SIM information within the frame
specified by GSM as specified in recommendation 3GPP 11.11 [9] (or 3GPP 51.011
[13]).
If operation mode is not allowed by the ME, a "+CME ERROR: <err>" is returned.
Between two successive +CSIM commands, there is no locking of the interface
between the SIM and the GSM application. Since in this situation some command
types and parameters can modify wrong SIM files, some operations, described below,
are not allowed for the CSIM command. However, it is possible to process them with
the CRSM command.
18.3.2 Syntax
Action command
AT+CSIM=<length>,<command>
+CSIM: <length>,<response>
OK
Read command
AT+CSIM?
OK
Test command
AT+CSIM=?
OK