yes they are on the same vdd and ground,
I just tried seperating them by putting the sedning end on a battery but no diferent.
Also the receiving, here is only one wire that is going in , the other wires are used for the LCD, obviously, the lcd works. I am putting the scope on the incoming port adn there is a signal in . The signal is sent every 500ms, Maybe that is too slow ?? and the receiving cant see it ..

ken