Fail safe one wire interface for optical emitter-detector...

Details Fail safe one wire interface for optical emitter-detector... Fail safe one wire interface for optical emitter-detector...

2005-06-14

2005-06-14

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S559120

Reexamination Certificate

active

06906307

ABSTRACT:
A one wire interface for optical emitter-detectors is disclosed that is fail-safe, simple, and includes diagnostics, noise and static protection. Two indicator lamps are used for diagnostics indicating four conditions; a) Ready, b) Not Connected, c) Blocked Beam, d) No power. This allows single or two conductor systems to have the same troubleshooting information as the 4-wire systems.

REFERENCES:
patent: 4390812 (1983-06-01), Seidler
patent: 4922168 (1990-05-01), Waggamon
patent: 5079417 (1992-01-01), Strand
patent: 5191268 (1993-03-01), Duhame
patent: 5233185 (1993-08-01), Whitaker
patent: 5285136 (1994-02-01), Duhame
patent: 5357183 (1994-10-01), Lin
patent: 5465033 (1995-11-01), Fassih-Nia
patent: 5633778 (1997-05-01), Chang

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