AT operating mode

In AT (Application Transparent) or transparent operating mode, all serial data received by the radio module is queued up for RF transmission. When RF data is received by the module, the data is sent out through the serial interface.

To configure an XBee module operating in AT, you must put it in command mode to send the configuration commands.

AT Command mode

When the radio module is working in AT operating mode, you must use the command mode interface to configure settings.

To enter AT command mode, send the three-character command sequence (usually "+++") within one second. Once AT command mode has been instigated, the module sends an "OK\r", the command mode timer is started, and the radio module is able to receive AT commands.

AT command structure

The structure of an AT command is:

AT[ASCII command][Space (optional)][Parameter (optional)][Carriage return]

For example:

ATNI MyDevice\r

If no valid AT commands are received within the command mode timeout, the radio module automatically exits AT command mode. You can also exit command mode by issuing the CN command:

(ATCN\r)