# Basic Setup Check

Initially you may want to see, that some basic RF communication between your boards is running.

At first flash xmpl_radio_range_<board>.hex. This application sends every 500ms a frame and stays in receive mode for the remaining time between the transmissions.

If your radio Boards have LED's, LED1 flashes quickly indicating that a frame is transmitted and LED 2 toggles with each received frame.

If you have a board connected to a UART, you will see the following output.

     .... todo: Screen ....

If nothing happens, that indicate that your setup is working correctly, go to the section Debugging a Setup from Scratch.