Patent ID: 8598736

Claim:
An input circuit for an alternating current signal from a pair of elongated conductors, said input circuit comprising: an interface structured to output a first signal from the alternating current signal of said pair of elongated conductors; a load switchable to said pair of elongated conductors; and a processor structured to: (i) output a second signal to switch said load to said pair of elongated conductors asynchronously with respect to said alternating current signal for a first predetermined time, (ii) input the first signal, (iii) determine if the input first signal is active a plurality of times during the first predetermined time and responsively set a first state of said alternating current signal, and, otherwise, set an opposite second state of said alternating current signal, and (iv) delay for a second predetermined time, which is longer than the first predetermined time, for the opposite second state before repeating said output, and, otherwise, delay for a third predetermined time, which is longer than the second predetermined time, for the first state before repeating said output.