Module is not detecting in Xctu

I am doing project based on voice recognition home automation for controlling home appliances how I can configure two ZigBees for wireless transmission as a transreceiver using series 2 ZigBee?

For two way serial communications, you can follow the quick start guide located at http://www.digi.com/products/xbee-rf-solutions/rf-modules/xbee-zigbee.

Just note that the standard XBee ZB (S2) module does not support HA. You need to use the S2C hardware for that.

I didn’t get what you said…please elaborate…

Try following the steps outlined at http://knowledge.digi.com/articles/Knowledge_Base_Article/Range-Testing-with-a-ZigBee-Mesh-Network/?q=zigbee+range+test&l=en_US&fs=Search&pn=1