System for monitoring a multiplicity of doors using multiple opt

Details System for monitoring a multiplicity of doors using multiple opt System for monitoring a multiplicity of doors using multiple opt

1994-04-28

1996-04-02

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340555, 109 56, H01J 4014

Patent

active

055043259

ABSTRACT:
A system for monitoring a multiplicity of doors including at least two optical transceivers mounted on each of the multiplicity of doors and communication apparatus for communicating with the optical transceivers mounted on each of the multiplicity of doors thereby to verify their position, the communication apparatus being operative to communicate with the optical transceivers on each of the multiplicity of doors via plural serial communications pathways, at least one of the plural pathways extending via optical transceivers mounted on a plurality of different doors.

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