The encoder and decoder are the brains of the system. The encoder detects the button presses or switch closures then formats them into a digital data stream and sends the data to the transmitter. The decoder takes the data stream from the receiver, checks to make sure that it is valid, and if it is, replicates the switch closures on its outputs. These outputs are then connected to the application circuitry that is being controlled. This system makes it appear as though the switches are connected directly to the application circuitry.