Siemens AT Command Set Cellular Engines Wireless Modules MC35 ユーザーズマニュアル
AT Command Set
MC35_ATC_01_V04.00
Page 12 of 238
02.04.2002
1.3 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 mo-
dem, FAX board). When the Siemens product names are required to distinguish the two models,
MC35 is short for the engine type and MC35T for the terminal.
Station), TA (Terminal Adapter), DCE (Data Communication Equipment) or facsimile DCE (FAX mo-
dem, FAX board). When the Siemens product names are required to distinguish the two models,
MC35 is short for the engine type and MC35T for the terminal.
To control your GSM engine you can simply send AT Commands via its serial interface. The control-
ling 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).
ling 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).
1.4 Supported character sets
The ME uses 2 character sets: GSM 03.38 (7 bit, see character tables in Chapter 9.5, pg. 234) and
UCS2 (16 Bit, refer ISO/IEC 10646). Also refer to Chapter 4.44 for information about selecting the
character set.
UCS2 (16 Bit, refer ISO/IEC 10646). Also refer to Chapter 4.44 for information about selecting the
character set.
When using an ASCII terminal to write characters differently coded in ASCII and GSM (e.g. Ä, Ö, Ü),
you need to enter escape sequences. Such a character is translated into the corresponding GSM
character value and when output later, the GSM character value is presented. Any ASCII terminal then
will show wrong responses.
you need to enter escape sequences. Such a character is translated into the corresponding GSM
character value and when output later, the GSM character value is presented. Any ASCII terminal then
will show wrong responses.
Table 2: Character definitions depending on alphabet (examples)
GSM 03.38
character
character
GSM character
hex. value
hex. value
Corresponding
ASCII character
ASCII character
ASCII
Esc sequence
Esc sequence
Hex
Esc sequence
Esc sequence
Ö
5C
\
\5C
5C 35 43
"
22
“
\22
5C 32 32
ò
08
BSP
\08
5C 30 38
@
00
1)
NULL
\00
5C 30 30
1)
Use of the GSM Null character may cause problems on application level when using a ´C´-function
as “strlen()“ and should thus be represented by an escape sequence.
1.5 AT command syntax
The "AT" or "at" prefix must be set at the beginning of each command line. To terminate a command
line enter <CR>.
line enter <CR>.
Commands are usually followed by a response that includes “<CR><LF><response><CR><LF>”.
Throughout this document, only the responses are presented, <CR><LF> are omitted intentionally.
Throughout this document, only the responses are presented, <CR><LF> are omitted intentionally.
Table 3: Types of AT commands and responses
Test command
AT+CXXX=?
The mobile equipment returns the list of parameters and
value ranges set with the corresponding Write command
or by internal processes.
value ranges set with the corresponding Write command
or by internal processes.
Read command
AT+CXXX?
This command returns the currently set value of the pa-
rameter or parameters
rameter or parameters
Write command
AT+CXXX=<...>
This command sets user-definable parameter values.
Execution command
AT+CXXX
The execution command reads non-variable parameters
affected by internal processes in the GSM engine.
affected by internal processes in the GSM engine.