The HT-694 decoder oscillator resistor connected to pins 7 and 8 must be of the same value as that in the transmitter so the oscillator frequencies are synchronized. The decoder must have its address pins configured the same as the address pins in a transmitter to receive data from that transmitter. When the decoder receives serial data into input pin 6 from a receiver circuit or module, it compares the three groups of address and data pulses. If at least two of the three groups are the same, the data is considered valid and is transferred to output pins 1 through 4. The data that appears at these pins is exactly the same as the data applied to the transmitter data pins 1 through 4.
All pins can be down, all up or any combination.
You can use these outputs to drive individual circuits or devices, or since there are four pins you can send four bits of information in binary format to represent a decimal count of 0 to 15. The HT694 has momentary data outputs. Data remains on the output pins only as long as data is being received. If you need latched data, you can use a HT-684L which has the same pin connections and provides latched data outputs that retain the last data sent until new valid data is received. These devices do not provide error correction.