Specifications

AT command set for S45 Siemens mobile phones and modems
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Siemens Document No.: A30880-A10-A001-3-D376
Revision: 1.8
Revision Date: 30. November, 2001
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2.2 The AT command set
GSM mobile telephones and modems can be operated via Remote Control using a serial interface (data cable or
infrared connection). Remote control is implemented by means of AT+C commands according to the ETSI GSM
07.07 [1] and GSM 07.05 [2] specifications, as well as several manufacturer-specific AT commands. These
commands are described in more detail in section 2.2.2.
A command entered at the user port generally begins with an ‘AT’ command prefix. The remainder of the line is
interpreted as a sequence of the commands described below. The commands are not case-sensitive. More than
one command may be given on a single line, with the semicolon serving as the delimiter between commands.
The “ITU-T Draft new Recommendation V.25ter” specification [3] applies to the sequence of the interface
commands. According to this guideline, commands should begin with the character string ”AT” and end with
”<CR>” (= 0x0D). The input of a command is acknowledged by the display of ”OK” or ”ERROR”.
A command currently in process is interrupted by each additional character entered. This means that you
should not enter the next command until you have received the acknowledgment; otherwise the current
command is interrupted.
The commands supported are listed in the tables provided in sections 2.2.1, and 2.3.1 through 2.3.9.15.
2.2.1 Hayes Standard commands
The Hayes standard commands correspond to the commands of AT Hayes compatible modems.
All commands in Table 2-6 expect a numeric argument; if this argument is omitted, the default of 0 is assumed.
The ATD command is a special command in that all characters specified in the same line (or up to a semicolon)
are considered part of the number to dial.
Command Function
A/ Repeat preceding command
AT... Prefix for all other commands
ATA
Accept call (V.25ter, according to [3])
ATB[n]
This modem command is used to set the bearer service for data connections
(cf. AT+CBST).
<n> can take one of the following values:
7
2400bps, asynchronous, V.22bis
11
4800bps, asynchronous, V.32
13
9600bps, asynchronous, 32
15
14400bps, asynchronous, V.34
25
2400bps, asynchronous, V.110 ISDN
27
4800bps, asynchronous, V.110 ISDN
29
9600bps, asynchronous, V.110 ISDN
31
14400bps, asynchronous, V.110 ISDN