Appendix F
AT Commands
Hayes Microcomputer Products is a leading manufacturer of modems that has
developed a language called the AT command set for controlling digital cellular
phones and modems. This AT command set has become the de facto standard.
The characters in this table are the most commonly used AT commands when
configuring a digital cellular phone or modem. Refer to the manual of the used
digital cellular phone or modem for information on which AT commands to use.
AT command
Description
~
Inserts a delay of 1/4 second.
^#
Inserts the phone number as defined in digital cellular
phone connection.
^^
Inserts character ^.
^C
Bearer Service: Connection Element.
^M
Inserts a carriage return and send command.
^S
Bearer Service: Speed including Protocol and NetDataRate.
AT
Starts a command line to be sent to phone.
AT&F[<value>] Sets the configuration parameters to default values speci-
fied by manufacturer of phone.
<value>:
•
0 = Factory default configuration profile
ATD<number>
Starts a call to the phone number given as parameter. If “;”
is present, a voice call to the given number is performed.
AT+CBST=
[<speed>
[,<name>
[,<ce>]]]
Sets the bearer service <name> with data rate <speed>,
and the connection element <ce> . Refer to the manual of
the used digital cellular phone or modem for a list of sup-
ported name, speed and connection element values.
AT+CREG=
[<mode>]
Enables/disables network registration reports depending on
the parameter <mode>.
AT+CREG?
Reports the <mode> and registration status <stat> of
phone.
<mode>:
•
0 = Disable network registration unsolicited result code
•
1 = Enable network registration unsolicited result code
<stat>:
•
0 = Not registered, ME is not currently searching a new
operator to register to
•
1 = Registered, home network
•
2 = Not registered, but ME is currently searching a new
operator to register to
•
3 = Registration denied
•
4 = Unknown
•
5 = Registered, roaming
AT commands
List of selected AT
commands
1032
AT Commands
