MC55_ATC_V04.00 Page 15 of 475 3/17/06
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1.3 Document conventions
Throughout the document, the GSM engines are referred to as ME (Mobile Equipment), MS (Mobile Station), TA
(Terminal Adapter), DCE (Data Communication Equipment) or facsimile DCE (FAX modem, FAX board).
To control your GSM engine you can simply send AT Commands via its serial interface. The controlling device
at the other end of the serial line is referred to as TE (Terminal Equipment), DTE (Data Terminal Equipment) or
plainly 'the application' (probably running on an embedded system).
All abbreviations and acronyms used throughout this document are based on the GSM specifications. For defi-
nitions please refer to TR 100 350 V7.0.0 (1999-08), (GSM 01.04, version 7.0.0 release 1998).
1.3.1 Quick reference table
Each AT command description includes a table similar to the example shown below. The table is intended as a
quick reference to indicate the following functions:
Example:
PIN: Is the AT command PIN protected?
% Yes
! No
§ Usage is dependent on conditions specified for the command, or not all command types are PIN
protected (for example write command PIN protected, read command not).
Note: The table provided in Section 20.3, Available AT Commands and Dependency on SIM
PIN uses the same symbols.
ASC0: Is the AT command supported on the first physical serial interface ASC0?
% Yes
! No
ASC1: Is the AT command supported on the second physical serial interface ASC1?
% Yes
! No
MUXn: Is the AT command usable on the Multiplexer channels MUX1, MUX2, MUX3?
% Yes
! No
§ AT command is usable, but under the restrictions specified in the section related to the command.
Note: The columns MUX1, MUX2 and MUX3 are relevant only when the GSM engine operates in Mul-
tiplexer mode, that is, when the first physical serial interface is partitioned into 3 virtual channels
by using the Multiplexer protocol. Usage is the same on ASC0 and MUX1.

Is the AT command supported in ALARM mode?
% Yes
! No
Charge: Is the AT command supported in CHARGE ONLY mode?
% Yes
! No
§ AT command is usable, but under the restrictions specified in the section related to the command.
Last: If commands are concatenated, this AT command must be the last one.
% Yes
! No
Note: See also Section 1.4, AT Command Syntax for details on concatenated AT commands.
PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last
! % % § § § % ! !
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