Patent ID: 8525660

Claim:
A warning system for a vehicle having a battery and having electrical wires connected to the battery, said system comprising: An inductively isolating interface having an input side adapted to be connected to the electrical wires for receiving power and having an output side for supplying power; A light bar having a power input adapted to be connected to the output side of the inductively isolating interface for receiving power, having light heads connected to the power input for receiving power for energizing the light heads and having a light bar controller for receiving control signals for selectively operating the light heads to generate visual warning signals in response to received control signals, wherein the inductively isolating interface is configured to be connected between the power input and the electrical wires to inductively isolate the electrical wires from the light bar thereby isolating the electrical wires from electrical noise generated by the light bar; A light bar PLT/I 2 C communication module adapted to be connected between the light bar controller and the electrical wires on the input side of the inductively isolating interface for receiving power line transceiver (PLT) control signals carried by the electrical wires and for converting the received PLT control signals into corresponding inter-integrated circuit (I 2 C) control signals provided to the light bar controller; A control head responsive to operator input for providing control signals; and A control head I 2 C/PLT communication module adapted to be connected between the control head and the electrical wires for receiving the I 2 C control signals provided by the control head and for converting the received I 2 C control signals into corresponding PLT control signals provided to the electrical wires wherein the inductively isolating interface inductively isolates the provided PLT control signals from electrical noise generated by the light bar; wherein I 2 C control signals generated by the control head in response to operator input are provided to the control head I 2 C/PLT communication module which provides corresponding PLT control signals via the electrical wires to the light bar communication module which provides corresponding I 2 C control signals to the light bar controller to selectively energize the light heads by power provided to the light heads via the inductively isolating interface to generate the visual warning signals.