Gateway for use in load control system

摘要

A gateway circuit which exchanges information between a leased-line information transmission system and a power line carrier information transmission system includes a control circuit which receives and formats information transmitted over the leased-line information system and a separate control circuit which receives and formats information received over the power line carrier system. The formatted information is provided to a third control circuit which buffers the information and converts between the leased-line format and the power line carrier format to enable signal exchange between the two information transmission systems. The general control circuit responds to load control commands generated by manual switches located on the control unit and to load control commands forwarded over the leased-line system. The general control unit also contains storage elements which maintain the operating state of electrical loads on the power line and only transmit control information when an operating state must be changed.