A control system including a programmable multiple channel digital controller which is operable to generate control signals which are transmitted over electrical power lines of a building complex for enabling receivers associated with functional devices for controlling the operation of functional devices,...http://www.google.fr/patents/US4060735?utm_source=gb-gplus-shareBrevet US4060735 - Control system employing a programmable multiple channel controller for transmitting control signals over electrical power lines
Control system employing a programmable multiple channel controller for ...
