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5. AT
COMMANDS
5.1 INTRODUCTION
This document describes the AT commands that may be used with Nokia D211 operating in
the GSM / HSCSD/ GPRS network. A short description, syntax, possible setting values and
responses of the AT commands are presented. Detailed description of supported commands
can be found in the appropriate specification.
Computers use AT commands to communicate with modems. Most communications
applications, however, have a user-friendly interface that hides these AT commands from the
user. When the software in the Nokia D211 has received an AT command, it responds with a
message that is displayed on the screen of the device you are using.
5.2 AT COMMAND SYNTAX
Refer V.25ter section 5 and GSM 07.07 section 4 for AT command syntax basics. This
section describes the three different command formats and default value mechanisms for
their parameters.
Note:
Note that the "AT" or "at" prefix must be included at the beginning of each
command line. You may type several AT commands on the same line, and in
such cases you need to type the "AT" or "at" prefix only at the beginning of the
command line.
5.2.1 S-register
commands
Table format used in command description sections:
Command
Response
<n>
values
set
Sn=<n>
x..y
(default z)
read
Sn?
<n>
xxx..yyy
S-register command factory default value (
&F
) is given in parenthesis under column ‘
<n>
values’. The existence of an S-register command may be queried by giving command without
equal or question marks (e.g.
ATS3
returns
OK
, but does not change the
<n>
setting).
<n>
may not be omitted when its value is set (e.g.
ATS3=
returns
ERROR
).
