A meter unit, co-located to an electric meter, and a building unit, co-located with an energy management system, cooperate to deliver electric meter relay pulses from the electric meter to an energy management system via a wireless link. Meter relay pulses are input to the meter unit from the electric...http://www.google.es/patents/US6577245?utm_source=gb-gplus-sharePatente US6577245 - Wireless isolation relay for remote metering
