what sets the valid in Rx is the dgood(pin) from transmitter so whenever the key pressed, the dgood become low and it is connected through wire to the valid pin in receiver so it will go out from the wait loop and display...
the thing is all goes well accept the value inside the num(register) is 0 when i display..is the way i use the serin and serout is correct?...do u have any suggestion..thanx very much