Method and apparatus for interfacing a power line carrier and an appliance

1. A communication and power line diagnostics system comprising:

a communication interface for interfacing an appliance with a power line carrier communication system, said communication interface comprising:

at least one power line connection for coupling said communication interface to a power line;

at least one appliance communication connection for coupling said communication interface to the appliance; and

processing circuitry for receiving a power line carrier transmission and translating the power line carrier transmission between a power line carrier communication protocol and an appliance communication protocol; and

a diagnostics module configured to diagnose the power line, said diagnostics module comprising a power line measurement connection for coupling said diagnostics module to the power line, said diagnostics module configured to detect a power line sag, detect and record power failures, measure a power line frequency and measure an average power line voltage, said diagnostics module responsive to at least one of the conditions.

2. The system of claim 1 , wherein said processing circuitry comprises a signal processor for receiving the power line carrier transmission and a communications processor for translating to the appliance communications protocol.

3. The system of claim 1 wherein said appliance communication connection is a serial bus connection.

4. The system of claim 1 wherein said appliance communication connection comprises a bidirectional appliance communication connection.

5. The system of claim 1 wherein said power line connection comprises a bidirectional power line carrier connection.

6. The system of claim 1 wherein said appliance communication connection comprises a signal line and a signal ground line.

7. The system of claim 1 further comprising a message buffer for storing a plurality of power line carrier transmissions.

8. The system of claim 1 wherein said processing circuitry further comprises a general purpose universal asynchronous receiver transmitter (UART).

9. The system of claim 1 wherein said power line connection comprises at least one of a 120V or 240V power line connection.

10. A method of communicating data between an appliance and a power line carrier using a communication interface, comprising:

interfacing the communication interface with the power line carrier;

interfacing the communication interface with the appliance;

diagnosing the power line carrier with a diagnostics module configured to detect a power line sag, detect and record power failures, measure a power line frequency and measure an average power line voltage, the diagnostics module responsive to at least one of the conditions, and configured to interface with the power line carrier and the communication interface;

receiving at the communication interface a power line carrier transmission over the power line carrier; and

transmitting the power line carrier transmission between a power line carrier communication protocol and an appliance communication protocol.

11. The method of claim 10 wherein said step of interfacing with an appliance comprises serially interfacing.

12. The method of claim 10 wherein said step of interfacing with an appliance comprises bidirectionally interfacing.

13. The method of claim 10 wherein said step of interfacing with a power line carrier comprises bidirectionally interfacing.

14. The method of claim 10 further comprising buffering a plurality of power line carrier transmissions.

15. The method of claim 10 wherein said step of interfacing with a power line carrier comprises interfacing with at least one of a 120V and 240V AC power line carrier.