> 16. | SIM Application Toolkit (SAT) Commands

> This chapter offers a brief reference to AT commands and responses related to the TC65's SIM Application Toolkit (SAT) implementation. A consistent and detailed description can be found in the "Remote-SAT User's Guide" [5]. For further advice please contact the Wireless Modules Application Engineering Department at Siemens AG.
> ETSI specification GSM 11.14 [27] defines SAT in detail.
> 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 TC65 and the SIM Application running on the SIM:

> • | Proactive commands are sent from the SIM application to the TC65's SAT, such as "DISPLAY TEXT".

> • | Envelope commands are sent from the TC65's SAT to the SIM application, such as "MENU SELECTION".