Enter Command mode

When using the default configuration values for GT (Guard Times) and CT (Command Mode Timeout), you must enter +++ preceded and followed by one second of silence—no input—to enter Command mode. However, both GT and CC are configurable. This means that the silence before and after the escape sequence—GT—and the escape characters themselves—CC—can be changed. For example, if GT is 5DC and CC is 31, then Command mode can be entered by typing 111 preceded and followed by 1.5 seconds of silence. When the entrance criteria are met the device responds with OK\r on UART signifying that it has entered Command mode successfully and is ready to start processing AT commands.

If configured to operate in Transparent operating mode, when entering Command mode the XBee 3 802.15.4 RF Module knows to stop sending data and start accepting commands locally.

Note Do not press Return or Enter after typing +++ because it interrupts the guard time silence and prevents you from entering Command mode.

When the device is in Command mode, it listens for user input and is able to receive AT commands on the UART. If CT time (default is 10 seconds) passes without any user input, the device drops out of Command mode and returns to the previous operating mode. You can force the device to leave Command mode by sending CN (Exit Command mode).

You can customize the command character, the guard times and the timeout in the device’s configuration settings. For more information, see CC (Command Character), CT (Command Mode Timeout) and GT (Guard Times).