Software Configuration Guide
FTDI drive
CUAV XTEND Radio's built-in USB to TTL chip is FT232FQ
Driver download
http://www.ftdichip.com/FTDrivers.htm
X-CTU Software configuration Guide book
http://pub.ucpros.com/download/90001003_A.pdf
Be careful do not to select the wrong model to configure, please read the configuration first, and then modify the configuration
Choose the wrong model and writing the wrong configuration will be change it
Software download
NEW X-CTU
https://www.digi.com/products/xbee-rf-solutions/xctu-software/xctu
New software documentation
https://www.digi.com/resources/documentation/digidocs/90001458-13/default.htm
xtcu Debugging and related configuration tutorials:
http://doc.cuav.net/tutorial/copter/optional-hardware/radio/usb-xbee.html