How to test Xbee Series 2 (s2)?

Well, I assume you have one of your Xbee is connected to the computer using a breakout and FTDI 232. something like this or this. (many other company are making the similar ones) The other one has something like this and Rx and Tx (in the case of sparkfun Din and Dout) are connected to each other/ which means that whatever will be send will be received too.

Make sure you have download X-CTU from digi website.

Run the program and you have to connect the serial port which is connected to FTDI, when I tried the name was "COME XX". Go to the modem configuration tab and click on read, if it asked for reset, just connect Xbee's pin 5 to Xbee's pin 10. Check the DH and DL. Keep the number somewhere.

This is the easiest way I found to test my Xbees 2 series.
1) make one as a coordinator AT (AT and API is well explained in Data sheet provided by Digi)
2) make sure that you use DH and DL of your other Xbee.
3) change packetization time to zero (this will send any data available for sending if you choose any other number it will wait for that period and if they were any other data coming, it will send them in one packet)
4) take the other one and program it as router/end device AT
5)  make sure that you use DH and DL of your other Xbee. 
6)  change packetization time to zero (this will send any data available for sending if you choose any other number it will wait for that period and if they were any other data coming, it will send them in one packet)

now you can go to the terminal tab and see if you get whatever you type in red or not, if you do that means everything is working, if not there is still one hope. Change all possible values in networking and address to the same value in the other one. Read the description about each value, if it could be a reason then change them first and try. If it was not still working read the God damn Data sheet. :D

Hint: do not give up easily, one does not simply burn a Xbee. :)