Patent ID: 6744820
Filing Date: 2004-06-01
Classification: B60R,H04B

Abstract:
A communication system comprising:an electrical conductor interconnecting a plurality of units for conducting electrical energy; energy supply means for providing electrical energy, having a voltage, onto said conductor; voltage messaging means for modulating voltage to convey messages from a first unit to a second unit via said conductor; and voltage receiver means for monitoring the voltage of the electrical energy to discern messages from the first unit; wherein said voltage messaging means includes means for adjusting voltage of the electrical energy past a first predetermined threshold to provide a first type message frame and for modulating the voltage of the electrical energy during the first type message frame to convey a first type message, and means for adjusting voltage of the electrical energy past a second predetermined threshold to provide a second type message frame and for modulating the voltage of the electrical energy during the second type message frame to convey a second type message.