Problem Between Arduino and XBee S1

Hi all, im new to xbee and arduino.

im trying to send a simple serial data from arduino to xbee and receive by another xbee that is connect to computer. The both xbee is configure using x-ctu and can communicate with each other in the terminal. The problem now is the serial data from the arduino cannot send to the xbee1. Is there problem with my arduino?? or my xbee s1??