Xbee pros and Arduino not working

Hi, I’m very new at this and have been reading tons of other posts, but I still can’t figure it out and would really appreciate help…

I am working on a project to ultimately control a quadrotor pc/laptop computer commands. Right now, I’m having a difficult time just getting two xbee radios to communicate with each other.

I have two series 1 xbee pros (http://www.sparkfun.com/products/8742):
-One is placed on the xbee explorer usb (http://www.sparkfun.com/products/8742) and connected to my laptop through a usb cable.
-The other is placed on an xtreambee board (http://store.diydrones.com/product_p/br-0015-01.htm) and connected as instructed in the manual to an ArduPilotMega IMU Shield (attached to the Ardupilot mega and powered through USB).

When I attach everything, LEDs light up and through X-ctu, I can communicate with the xbee attached to the explorer usb and modify it (this works for either xbee plugged into it). My problem is that I can’t get any sort of communication with the xbee attached to the Ardupilot mega. Every time I try the range test, it says “timeout while waiting for data” repeatedly.
I’ve set the baud rates to 9600 for both xbees and the PAN IDs are the same. I also set the DH/DL to the SH/SL of the other board for both xbees.

Does anyone know what I’m doing wrong? I need to get this working pretty soon so I’d appreciate any suggestions, Thanks!

For the range test to work, you have to connect together the DIN and DOUT lines of the remote XBee. Could that be it? (You’d want to disconnect the Ardupilot.)

Yes, that was my problem, they work now… thank you!