XBee: Not Working Properly

Using Arduino Networking, Protocols, and Devices
1

Hello,

I have two S1 XBee (linked below). I have had them for a while now and decided to implement them into my design.

One of them is working perfectly fine, while the other is giving me some issues.

  1. Using XCTUNG (Mac version) I am unable to detect the XBee that isn't working properly

  2. The operating voltage is interesting. Using the following shield from robotshop.com, I am doing to rudimentary testing by transmitting serial commands. I am noticing that the operating voltage, which I am scoping from the transmitting pin, is 700mV rather than 3V normal operation.

http://www.robotshop.com/ca/en/motomama-h-bridge-motor-driver-shield.html

What can I do to get the XBee to working properly?

Thanks,