Patent ID: 6901336

Claim:
A sensor device couplable to a host device via a single pair of wires, said single pair of wires comprising a first wire and a second wire, and said host device having a first power source couplable to said first wire and a second power source couplable to said second wire, said sensor device comprising: a first power source node couplable to said first wire; a second power source node couplable to said second wire; a sensing interface operable to sense at least one signal on at least one node under test; measurement circuitry operable to generate an a/c sensor measurement signal; a first current modulator operable to modulate said a/c sensor measurement signal with a current component of a power signal present on said single pair of wires; digital sensor communication circuitry operable to generate a serial digital sensor data bit stream comprising a digital sensor communication signal; and a voltage modulator operable to modulate said serial digital sensor data bit stream with a voltage component of said power signal present on said single pair of wires.