Sorry, I am not sure if I am in the correct category. Also, I am a beginner so be kind 
I have two Xbee-Pro 900HP radios. A router and a coordinator. The router has a GPS connected to it. The GPS coordinates xmit over to the Coordinator just fine. My question, is there a way to prefix the GPS datastream from the the Router to the Coordinator with the ID (or any unique identifier)? Eventually I would like to add additional Xbees with additional sensors. I need a way to identify what Router the data is coming from on the Coordinator. Any help would be greatly appreciated.
Wrwygal,
The only way to do that out side of the GPS is to enable API mode on the Coordinator (receiving side). Then the output will be in our API frames.
Digi Support