I already check my Dout and Din pin at HT12E/HT12D using Oscilloscope but the result show nothing .Only a long straight line shows at scope.It means No output/input from my HT12E and HT12D either I'm using direct connection or not.The resistor value for my OSC pin is exactly the same with what is listed in rentron pdf. But mr.Bruce said earlier that the resistor's value depends on voltage supply at HT12E/HT12D .So I check my voltage supply at vcc pin and I got 5.04 for HT12E and 5.06 for HT12D.Actually how to calculate the resistor value for OSC if it's really depends on voltage supply??