REMOTE SUPERVISORY AND CONTROLLING SYSTEM PERFORMING DIMMING CONTROL OF LIGHT LOADS

摘要

A dimming switch terminal unit for monitoring a dimming-up switch and dimming-down switch and a dimming control terminal unit for performing dimming control of an associated light load are connected to a central control unit through a two-wire signal line. The central control unit accesses each of the terminal units to perform time-divisional multiplex transmission of monitor data and control data therebetween. When the dimming-up switch or dimming-down switch is depressed, the central control unit detects monitor data indicating the switch depression and sends to the dimming control terminal unit control data instructing it to start dimming-up or dimming-down control. The dimming control terminal unit continues to dim up or dim down the associated light load until the dimming-up switch or dimming-down switch is released and the dimming control terminal unit receives control data instructing it to stop dimming up or dimming down the light load.