Sparkfun Electronics USB Explorer Manual page 7

Page 7 of 16
As you can see by scrolling down the right half, there are a lot of
configuration settings available. We'll get to some of those later. For now,
though, verify that the configurable settings visible in the screenshot above
match those of your XBee (channel=C, PAN ID=3332, DH=0, DL=0, MY=0).
Do It Again
To test communication between your XBee's you'll need to connect your
second XBee to a computer as well. That means doing the "Add device"
dance one more time.
If you have another computer available, you can install X-CTU on that as
well and perform the same set up. You can certainly perform this test with
both XBees connected to the same computer as well, just make sure you
select the correct port number when you're adding the second XBee.
If you add a second XBee to the same computer, a second entry will be
added to the "Radio Modules" list. Selecting either of those entries will show
the configuration settings for that, specific XBee.
Note that there are two XBees in the list on the left. The configuration
values shown are for the highlighted XBee.
If you're ever unsure which XBee is which, try to match up the MAC
numbers. These numbers are printed on a sticker on the bottom side of
your XBee, and they're also listed in XCTU. (It's listed as the "Serial
Number" high and low, and is un-modifiable.)