An energy management controller is coupled via a clock line pair, a "data out" line pair and a "data in" line pair, to a plurality or group of stations each having energy using equipment. Each station is electrically coupled to each line pair at spaced points along the line pairs. Each station counts...http://www.google.ca/patents/US4661914?utm_source=gb-gplus-sharePatent US4661914 - Energy management control apparatus
