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Remote-SAT User's Guide

MC35_SAT_01_v02.00 Page 10 of 65 11.01.2002

1.1.5 Parameter Types

Strings are passed as UCS2 characters, usage of the GSM alphabet is also possible. However, use of

the GSM alphabet is not recommended since a SIM can contain text which then is not displayable (e.g.

Greek characters). To select the type of alphabet, use the AT^SSTA command. The type is

determined both for inputs and outputs.

UCS is specified in ISO/IEC 10646. There are 2 and 4 octet versions available, of which only the 2-

octet variant is used, known as UCS2.

The 65536 positions in the 2-octet form of UCS are divided into 256 rows, each with 256 cells. The first

octet of a character representation gives the row number, the second the cell number. The first row,

row 0, contains exactly the same characters as ISO/IEC 8859-1. The first 128 characters are thus the

ASCII characters.

The octet representing an ISO/IEC 8859-1 character is easily transformed to the representation in

UCS, by putting a 0 octet in front of it. UCS includes the same control characters as ISO/IEC 8859 and

these are also in row 0.

e.g. ’<x><x><n><n>’

<x><x> specifies the character set.

<n><n> specifies the character.

1.1.6 States of Remote-SAT

The communication with the SIM Application Toolkit is performed via the AT commands detailed in the

following chapters.

In general, the type of AT command that can (and should) be issued depends on the current state of

the Remote-SAT interface.

The current state of Remote-SAT is determined by

1. the application running on the SIM,

2. the application running on the TA (external controller),

3. the internal actions of the ME (especially SAT and Call Control).

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Siemens MC35 User Manual Page 10