Communications: electrical – Selective – Interrogation response
Patent
1983-08-30
1985-11-26
Rowland, James L.
Communications: electrical
Selective
Interrogation response
187 29R, B66B 300
Patent
active
045556890
ABSTRACT:
An elevator system including an elevator car, a controller for directing the elevator car to serve the floors of a building, lamps at each floor served by the elevator car, and a processor at each floor, including a microcomputer, for energizing and deenergizing the associated lamps. The controller issues illumination commands which indicate the desired illumination status for predetermined lamps, which commands are implemented by the processor associated with the lamp. Each processor includes a detector which determines the actual illumination status of the lamp in question, and a comparator for comparing the actual status and the commanded status, to detect lamp malfunctions. A malfunction detection is stored and used to prevent the associated lamp from subsequently being energized, until service personnel have corrected the problem.
REFERENCES:
patent: 3903499 (1975-09-01), Oliver
patent: 4234866 (1980-11-01), Kuroda et al.
patent: 4383240 (1983-05-01), Staats, Jr.
patent: 4418795 (1983-12-01), Trosky et al.
patent: 4458788 (1984-07-01), LePore
"On-Board Multiplexing System Checks Car's Lights Automatically", Electronics, Aug. 30, 1979, pp. 68, 70, J. Gosch.
Brick Michael J.
Dirnberger Linus R.
Lackey D. R.
Rowland James L.
Tumm Brian R.
Westinghouse Electric Corp.
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