Your transmitter, when you release the push-botton, should Tx ascii(100) or "d" then reciever will reset to zero both relays

Code:
start:                                                          
serin GPIO.2,N2400,["pl65"],w1
if w1=24 then gpio.5=1
if w1=51 then gpio.1=1 
if w1=100 and gpio.1=1 or gpio.5 = 1 then gpio = 0 
goto start
Al.