need helo for using XBee-PRO XSC Development Kit w/ 2 XBee-PRO modules n configure UART

i got 2 XBee-PRO XSC Development Kit and 2 XBee-PRO modules which i want to use for my project.

since X CTU can be used in PC only but i cant use that in my project.
i need to use is just these xbee dev kit and 2 xbee pro modules.

now i want to know how can i send a 8 bit data from Microcontroller to a Xbee Development kit and transmit a data support 11111111 and receive the same data and get it to microcontroller

i dont know how can i configure it like using UART.
any one can giv me a small help in configuring UART ?

i want to do is as in fig