I have heard it said that two XBEEs can communicate out of the box. So, I assume, they can communicate with just factory settings. Is this true?
Rondo, If you are referring to the XBee 802.15.4 modules or the SX product, that is correct.
The answer depends on what Digi XBee module are we talking about. It would be correct for 802.15.4 or DigiMesh modules but not for Zigbee. Zigbee units require some basic configuration like assigning Coordinator, setting network PAN ID to initiate communication.