I am tried a basic project, which I need to control a led remotly. I have 2 xbee AT modules, 1 arduino mega 2560 and a led to do it. I liked the D18 and D19 ports of the arduino to DIN and DOUT of the xbee router respectvly. I have tested just the arduino without xbees and it works., I have tested the communication of the two xbee modules by X CTU and it is fine. However, when I try to command by XBEE coordenator a order to arduino by XBEE router , it doesn´t work. Have I used a wrong adapter? Or somebody have a solution?