Xbee communication problem

Hi friends,
i want to test wireless communication between two xbee (xb24-aci-001) modules and each modules is connected with computer's serial port. i don't have the board for xbee. i have designed the sample board for it, schematic attached. And i am using x-ctu software. Using this software, when i press test/ query button, error msg appears that "Unable to communicate with modem". So my question is that, wether there is any problem in my board? or i am missing something important? am i going in right direction?

Please give me direction............