Intrinsically safe multi-drop communications link

Details Intrinsically safe multi-drop communications link Intrinsically safe multi-drop communications link

1985-10-02

1987-09-01

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

307200A, 361100, 455607, 455617, H03H 512

Patent

active

046913840

ABSTRACT:
A multi-drop communication link, consisting of a master and a plurality of slaves is intrinsically safe for use in a hazardous environment. Slaves are in parallel and communicate with the master through transmit and receive shunt-diode safety barriers. An opto-coupler interface is provided between each slave and the transmit and receive circuits communicating with the master. The opto-couplers comprise infrared emitter-detector pairs which can be spaced apart by an intrinsically safe distance.

REFERENCES:
patent: 3373291 (1968-03-01), Peterson et al.
patent: 3454790 (1969-07-01), Rockwell
patent: 4228323 (1980-10-01), Feiner
patent: 4306803 (1981-12-01), Donohue et al.
patent: 4340922 (1982-07-01), Delaporte et al.
patent: 4547855 (1985-10-01), Lanyi et al.

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