Contact sensing module embodying loop power supply and state sen

Details Contact sensing module embodying loop power supply and state sen Contact sensing module embodying loop power supply and state sen

1989-12-29

1992-01-21

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

200312, G08B 2100

Patent

active

050831160

ABSTRACT:
A single module for relay, limit switch or related devices for self-powering the set of contacts and sensing the state of the contacts, compatible with Opto 22 and related I/O systems interfacing microprocessors and industrial processes and the like and with further features, if desired, of a single isolation device for both power and signal isolation such as a transformer, preferably employing conversion to D.C. in the tranformer output and optional resonant mode flyback pulses to step up the primary drive voltage.

REFERENCES:
patent: 4949066 (1990-08-01), Reinhardt
Opto 22, Microprocessor I/O Systems Catalog.

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