On both pins, OSC1 and OSC2 are used to connect the external resistor, which controls the internal clocks of the chips, which controls how fast the data is sent. Pin 9 is power, and pin 28 is ground on both chips. You might want to go back and read the HT-12D and E explanations if you haven't already, since I'm not going to explain the functions of all the pins again. Power is pin 12, and ground is 24. On the decoder, the HT-648L, pin 9 is the data input pin.
Reliability degrades severely with range as well.
Sample circuits and whatnot can be found here . Post a reply .