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I just put together a UAV control system using an APM. This project uses 900MHz Xbee radios. THe APM is working perfectly and all functions ( atleast those that i tested on the ground) are working well. The unit is giving perfect telmetry data through the USB cable and HKS  can read and show me all the data. When I connect the Xbee radio , there is no telemetry data available. Here is a list of what i did -

Used XCTU and followed the tutorials to update the firmware and setup the Modem VID , Serial Baud Rate ( 57600 ) and all other parameters as per the guides i found on the website.

Edited the APM_config.h file to include the following : -

#define SERIAL3_BAUD 57600  

#define GCS_PORT 3 

#define GCS_PROTOCOL GCS_PROTOCOL_LEGACY

My Xbee modules were purchased from the diydrones webstore. I am using a Xbee USB explorer from

http://www.rhydolabz.com/index.php?main_page=product_info&cPath=130_133&products_id=480

on HKS, when i connect to the xbee usb com port , the serial data shows -

OUT:$Q,0,0*51

checking 57600 baud

and then nothing.

Numerous resets and reconfiguration attempts using XCTU resulted in no improvements.

The TX , RX LEDs on both transmitter and receiver donot come on.

What else can I try?