Specifications
Chapter 14 – SIM Application Toolkit (SAT) Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 243
Chapter 14 – SIM Application Toolkit
(SAT) Commands
This chapter offers a brief reference to AT commands and responses related to the SIM Application Toolkit (SAT)
implementation.
SIM Application Toolkit (SAT) is a technology that allows an application running on the SIM to control the Mobile
Equipment (ME). Remote-SAT (RSAT) provides a link between applications located on the SIM and a customer
application (TA). The purpose of RSAT is to allow the TA to send AT commands to the SAT interface and to display
all SAT activities on the user interface of the customer application.
Two groups of commands are exchanged between the SAT located on the MC75 and the SIM Application running
on the SIM:
• Proactive commands are sent from the SIM application to the EDGE modem's SAT, such as "DISPLAY
TEXT".
• Envelope Commands are sent from the EDGE modem's SAT to the SIM Application, such as “MENU
SELECTION”.
14.1 AT^SSTA SAT Interface Activation
Description: The AT^SSTA write command can be used to specify the Remote-SAT activation mode <mode>
and, if Explicit Response mode is enabled, to explicitly activate the Remote SAT interface.
Removing and inserting the SIM does not affect the activation status.
SAT commands which are not using the AT interface (non MMI related SAT commands; e.g.,
PROVIDE LOCAL INFORMATION) are executed without activating Remote-SAT.
The read command can be used to request the current operating status and the used alphabet of
the Remote-SAT interface.
Syntax: Test Command: AT^SSTA=?
Response: ^SSTA:(list of supported <state>s), (list of supported <Alphabet>s)
OK
Read Command: AT^SSTA?
Response: ^SSTA: <state>, <Alphabet>, <allowedInstance>, <SatProfile>
OK
Write Command: AT^SSTA=<mode>[, <Alphabet>]
Response: OK
Parameters:
<state> The Multi-Tech wireless device Remote-SAT interface states.
0 RESET
1 OFF
2 IDLE
3 PAC
4 WAIT
<Alphabet>
0 Default. GSM character set. Input of a character requests one byte; e.g., “Y”.
1 UCS2. To display the 16 bit value of characters represented in UCS2 alphabet a 4 byte
string is required; e.g., “0059” is coding the character “Y”. For details please refer to ISO/IEC
10646.
<allowedInstance>
0 SAT is already used on another instance. Only test and read commands can be used.
1 SAT may be started on this instance via the write version of this command.
<SatProfile>
SAT profile according to GSM 11.14. The profile tells the SIM Application which features
(e.g., proactive commands) are supported by the SIM Application Toolkit implementation of
the Multi-Tech wireless device.
<mode> Select Remote SAT activation mode.
Parameter is stored non-volatile and takes effect after next restart of the ME. Removing and
inserting the SIM does not affect the activation status.
0 Automatic response (AR) mode.
All commands and responses are exchanged automatically between the ME and the SIM
application. This eliminates the need to enter any Remote SAT AT commands incl. the
AT^SSTA command.
If AR mode is enabled the ME enters the OFF state (<state>=1) after reboot.