Patent ID: 6437686
Filing Date: 2002-08-20
Classification: B64F,H05B

Abstract:
A system for monitoring and controlling airport facilities having at least one of a plurality of lamps, said system comprising:a plurality of terminals connected in series to a power line derived from a fixed current generator, for monitoring individually said airport facilities via a rubber transformer; and a host station connected to a higher order system of said airport facilities, for transmitting control signals to each of said terminals using a power-line carrier of said power line based on a signal from said higher order system and the monitoring signal to said host station using the power-line carrier of said power line, wherein each of said host station and said terminals comprises: zero cross detection means for detecting the zero cross of power source waveform of said power line; a data processing calculation control section for creating a control command for respective terminals and a monitoring signal of the airport facilities as text data; and signal insertion means for inserting said text data into said power line by a predetermined modulation based on the zero cross detected by said zero cross detection means, and wherein said host station comprises means for creating a first text data based on said control command, and inserting the text data into said power line by using zero crosses of a plurality of cycles of said power source waveform; and said respective terminals comprise means for creating second text data, which is a monitoring signal of the airport facilities, each of said terminal being allocated to each cycle of said power source waveform, and for inserting said second text data into said power line using the zero cross of a predetermined cycle of said power source waveform, after the reception of said first text data power line carried from said host station, when a communication between said host station and said plurality of terminals is to be performed.