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S
S
E
E
C
C
T
T
I
I
O
O
N
N
9
9
–
–
A
A
T
T
C
C
All modem functions are controlled using the same industry-standard AT commands that are used to
control landline modems. A knowledge of all these commands is not required by most users, but are
provided here as a reference.
AT Command Types
There are several types of AT commands as defined in the following list;
• Configuration Commands
• Status Control Commands
• Serial Interface Control Commands
• Security Commands
• Identification Commands
• Call Related Commands
• Network Service Commands
• Internet Service Commands
• GPRS Commands
• Short Message Service (SMS) Commands
• SIM Related Commands
• Hardware Related Commands
The parameters set by the various AT commands in this section are applied to all subsequent calls
and will be used each time you place a call. As such, your custom settings (if not saved in a profile)
will be available until you power down the modem. These settings are lost upon powerdown
if not saved. For further information, refer to the Siemens TC65/MC75 AT Command Set document
available from Siemens.
Command Line Syntax
The "AT" or "at" prefix must be set at the beginning of each command line. To terminate a command
line enter <CR>. Commands are usually followed by a response or, result codes, that includes
"<CR><LF><response><CR><LF>".
Table: 9.1 Command Syntax
AT command type
Test command
Read command
Write command
Exec(ution)
command
Commands may be edited using the backspace key, but the backspace will not delete the AT
attention command at the beginning of the command line.
O
O
M
M
M
M
A
A
N
N
D
D
R
R
E
E
F
F
E
E
R
R
E
E
Syntax
AT+CXXX=?
AT+CXXX?
AT+CXXX=<...>
AT+CXXX
N
N
C
C
E
E
Function
The mobile equipment returns the list of parameters
and value ranges set with the corresponding Write
command or by internal processes.
This command returns the currently set value of the
parameter or parameters.
This command sets user-definable parameter values.
The execution command reads non-variable
parameters determined by internal processes in the
GSM engine.
001-0003-829 Revision 1
Page 39 of 65
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