User guide

Developers guidelines | AT commands
15 June 2010
AT commands
Introduction to AT commands
This chapter describes how AT commands are used to exchange information with the
phone, the built-in modem and Bluetooth module. The AT commands are listed at the
end of this chapter. For a description of each command, refer to “AT commands” on
page 27.
You use AT commands to:
• Configure the phone to connect via USB cable, infrared port, Bluetooth or the
system bus.
• Configure the modem to connect via USB cable, infrared port, Bluetooth or the
system bus.
• Request information about the current configuration or operational status of the
phone or the modem.
• Test availability in the phone or modem and, when applicable, request the range of
valid parameters for an AT command.
Built-in modem operating modes
The built-in modem can be set in any one of the following three modes of operation:
Changing the built-in modem operating mode
The following illustration summarises the methods that are used to switch between the
three built-in modem operating modes:
Offline command
mode:
When first switched on, the built-in modem is automatically placed in offline
command mode and is then ready to receive AT commands.
Online data mode: This allows normal operation of the built-in modem, to exchange data or facsimile
with a remote modem.
Online command
mode:
This allows sending AT commands to the built-in modem while still remaining
connected to the remote modem.