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S
AT Command Reference
Release r02
www.stollmann.de
Page 5 of 33
1 Introduction
This documentation specifies the command interface for the S.
The S supports AT command mode.
1.1 AT Command Mode
Each command line consists of a prefix, a body and a terminator.
All command lines begin with the prefix
AT
(ASCII 065, 084) or
at
(ASCII 097, 116).
The body is a string of characters in the ASCII range 032-255. Control characters
other than <CR> (carriage return; ASCII 013) and <BS> (back space; ASCII 008) in
a command line are ignored.
The terminator is <CR>.
There is no distinction between upper-case and lower-case characters. A command
line can have a maximum length of 80 characters. It is automatically discarded if the
input is longer. Corrections are made using <BS>. Multiple commands on the same
command line are not allowed.
Commands have the following syntax:
Syntax
Description
AT<command>=<value><CR>
Write the value of the command
Responses are sent back to the host and can be any of the following:
Responses
Description
<CR><LF>value<CR><LF>
Read only value (e.g. AT+BOAD)
<CR><LF>OK<CR><LF>
Successful final message
<CR><LF>ERROR<CR><LF>
Error message, command not supported
Note: Exceptions of this syntax are marked seperately.
1.2 Escape Sequence
To enter the command mode during an active data connection the following se-
quence (escape sequence) can be used:
<delay time
1
>
<+><+><+>
<delay time>
1
Delay time defined in the S12 register (see page 16)