Siemens M1 User Manual
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gsm-m1-e.fm
GSM M1 Module, English: A24859-N4000-A100-1-7677
6.3.96
Technical reference section
With the development of intelligent modems, an command language was introduced
in the U.S. called the AT standard. Over the past few years, this language has been con-
sistently enhanced and has gained international acceptance. Most modems and com-
munication programs work with this command language or can be set to use it.
The AT standard is a line-oriented command language. Each command line must begin
with the letters AT, with the sole exception of the A/ command. The commands are in-
troduced at the end of this section. The letters AT are also known as the attention code.
The attention code signals your GSM module that one or more commands will follow.
The GSM module examines this command line prefix.
You have connected your GSM module to your PC. You can now connect to your GSM
module. To do so, start up a communication program on your PC.
Set the following transmission parameters (characteristics):
COM interface:
1 - 4, depending on which one the M1 is connected to
Rate:
2400 - 19200 baud
Data bits:
8
Parity:
None
Stop bits:
1
Duplex:
Full
The GSM module supports autobauding on the V.24 interface with transfer rates from
2400 to 19200 baud and the data format 8N1.
• Command lines must always begin with AT.
• Multiple commands can be combined on one command line. To improve legibility,
you can enter spaces between the individual commands. The GSM module ignores
these spaces.
• Commands that are specified in this manual with "0" in the last position can also be
entered without this "0". Example: ATQ has the same effect as ATQ0.
• A command line must end with a
ter" on the keyboard. This fact will not be mentioned again in this manual.
The AT standard
AT command line prefix
Connecting to your GSM module
Command syntax of the AT standard