SYSTEM FOR CONTROL OF LIGHTS AND MOTORS

摘要

A system for independent control of electric motors and electric lights includes a plurality of two-wire wallstations coupled in series via power wires between an alternating-current (AC) source and a light/motor control unit. The light/motor control units is preferably located in the same enclosure as an electric motor5 and an electric light and has two outputs for independent control of the motor and the light. The light/motor unit and the wallstations each include a controller and a communication circuit that is coupled tot he power wiring via a communication transformer and communication with each other using a loop current carrier technique. The light/motor control unit and the wallstation utilize pseudo random orthogonal codes and a median filter in the communication process.