Power line communications method

Details Power line communications method Power line communications method

2006-01-17

2006-01-17

Nguyen, Hung (Department: 2636)

Communications: electrical

Systems

Selsyn type

C340S315000, C340S315000, C340S315000, C363S037000, C363S065000

Reexamination Certificate

active

06987444

ABSTRACT:
A method of communicating over a power line is disclosed, the method comprising the step of modulating a current component of an AC power signal present on the power line. Also disclosed is a communications protocol for communication between a monitoring unit and an appliance, the protocol having two modes of operation, the first mode being an on-line single direction protocol for communications from the appliance to the monitoring unit via modulation of a current component of an AC power signal between the monitoring unit and the appliance, and the second mode being an off-line protocol for communications at least from the monitoring unit to the appliance, the second mode being operable only when the power signal is not present between the monitoring unit and the appliance.

REFERENCES:
patent: 5264823 (1993-11-01), Stevens
patent: 5404127 (1995-04-01), Lee et al.
patent: 5491463 (1996-02-01), Sargeant et al.
patent: 6040759 (2000-03-01), Sanderson
patent: 6252823 (2001-06-01), McDonald et al.

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