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14.
SIM related Commands
The AT commands described in this chapter are related to the Subscriber Identity Module (SIM) connected to
MC55.
Note:
If using data from the SIM please bear in mind that the content of all Elementary Files is subject to change at any
moment!
This is true because the network can change the SIM's data in the background via the SIM Application Toolkit
(SAT) procedure "Data download to SIM". For a detailed description please refer to GSM 11.14, [22].
To get informed that changing Elementary Files has taken place the TA needs to hook to the SAT Proactive Com-
mand "REFRESH". To achieve this, the AT command interface of SAT, i.e. Remote-SAT, needs to be activated.
An overview is given at Chapter 15.,
with the document "Remote-SAT User Guide" [4].
14.1
AT+CRSM Restricted SIM Access
offers easy access of the Elementary Files on the SIM. Access to the SIM database is restricted to the
AT+CRSM
commands which are listed at <command>. However, additional SIM commands are available via AT^SXSM.
All parameters of
AT+CRSM
interface locking and file selection routines.
As response to the command, the MC55 sends the actual SIM information parameters and response data. Error
result code "+CME ERROR" may be returned if the command cannot be passed to the SIM, e.g. if the SIM is not
inserted. However, failure in the execution of the command in the SIM is reported in
eters.
Please beware of possible changes to Elementary Files by the network at any time, refer Chapter 14.,
related
Commands.
Syntax
Test Command
AT+CRSM=?
Response(s)
OK
Write Command
AT+CRSM=<command>[, <fileID>[, <P1>, <P2>, <P3>[, <data>]]]
Response(s)
+CRSM: <sw1>,<sw2>[,<response>]
OK
ERROR
+CME ERROR:
<err>
Reference(s)
GSM 07.07
Parameter Description
(num)
<command>
SIM command number.
176
MC55_ATC_V04.00
Confidential / Released
SIM Application Toolkit (SAT)
are used as specified by GSM 11.11 [21]. MC55 handles internally all required SIM
READ BINARY
Page 368 of 475
Commands, additional information is available
PIN
ASC0 ASC1
MUX1
%
%
%
%
and
<sw1>
<sw2>
MUX2
MUX3 Charge
%
%
!
!
param-
SIM
Last
!
3/17/06
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