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Centralized apparatus for displaying disordered locations of lighting fixtures and method of collecting information of the disorders

  • US 5,373,453 A
  • Filed: 10/07/1991
  • Issued: 12/13/1994
  • Est. Priority Date: 02/06/1990
  • Status: Expired due to Fees
First Claim
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1. A centralized disorder displaying apparatus for lighting fixtures and for a lighting circuit including power lines and a plurality of discharge lamps, the apparatus comprising:

  • a plurality of lighting unit disorder detectors connected to said lighting circuit in such a manner as to detect disorder state in the power supply voltage, ballast coil and discharge lamp, and to communicate detected disorder data to a central control processor;

    a plurality of coupling means for coupling said unit disorder detectors with said power line in such a manner as to communicate with a frequency other than the frequency of said power line;

    another coupling means for coupling said power line with said central control processor;

    said central control processor having means for sequentially collecting and memorizing said disorder data detected by said unit disorder detectors through bilateral communications; and

    a disorder display connected to said central control processor in such a manner as to visually display the memorized disorder data based on the display command inputted by the operator,(a) said central control processor means including;

    a central processing unit (CPU);

    a first transmitting/receiving section (UART) for converting the data of said CPU and the data of said unit disorder detectors from parallel signals to serial signals and from serial signals to parallel signals;

    a first clock signal generator for supplying clock signals to said first transmitting/receiving section;

    a modem section for modulating and demodulating the serial signals of said first transmitting/receiving section and the signals of said unit disorder detectors; and

    a memory for storing the disorder data; and

    ,(b) each said lighting unit disorder detector including;

    a disorder detecting means connected to said lighting circuit in such a manner as to generate disorder signals for respective types of disorders;

    an encoder for converting the disorder signals or said disorder detecting means to digital signals before supplying them to a second transmitting/receiving section;

    a decoder for supplying control signals to said encoder and to said second transmitting/receiving section after decoding the data signals from said second transmitting/receiving section;

    said second transmitting/receiving section being for converting serial signals of said CPU to parallel signals before sending them to said decoder, and for converting parallel signals of said encoder to serial signals before sending them to said CPU;

    a second clock generator for supplying to said second transmitting/receiving section clock signals having a frequency similar to that of the clock signals of said first transmitting/receiving section of said central control processor;

    a modem for modulating the serial signals of said second transmitting/receiving section, and for demodulating the signals of said CPU;

    a power source voltage detecting section and pilot lamps thereof for detecting the power source voltage;

    a pulse detecting section and pilot lamps thereof for detecting as to the existence or absence of pulse generations; and

    ,a current detecting section and pilot lamps thereof for detecting the current flow through discharge lamps.

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