problem with ht12e and ht12d

i work on ht12e and 12d with frq 433Mhz
dudes i hav a problem here
when i power up HT12E the data pins read 0.2volts(given 5v VDD)(is this a casual thing😕)
at the receiver end the DOUT pins read only 0.75v what ever the data i try to transmit the RX dataout remains like this what do u think the problem may be 😔

the DATA IN pin of RX module keeps changing(is this a casual one😕)

i hav shown u the schematics