Open circuit detector for differential encoder feedback

Details Open circuit detector for differential encoder feedback Open circuit detector for differential encoder feedback

1986-10-07

1988-08-16

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340652, 34087028, 307500, G08B 2100

Patent

active

047647590

ABSTRACT:
An apparatus is provided for self-monitoring a communication circuit incorporating a differential driver for malfunctions with a malfunction detector located remote from the driver. The malfunction detector monitors the state of signals received at the remote location on a pair of lines coupled to the driver. Preferably, the detector includes a pair of back-to-back light emitting diodes, one of which will emit light so long as the received signals are in opposite states, and neither of which will emit light when the received signals are not in opposite states as will occur during a malfunction. The detector further preferably includes a phototransistor responsive to the diodes to provide a malfunction signal when neither diode emits light. Alternatively, the detector may comprise an exclusive-OR logic gate.

REFERENCES:
patent: 3611338 (1971-10-01), Kramer
patent: 3873979 (1975-03-01), Craford et al.
patent: 3964020 (1976-06-01), Dickerson
patent: 4155080 (1979-05-01), Kovacs
patent: 4250501 (1981-02-01), Pokrandt
patent: 4421976 (1983-12-01), Jurek
Product Brochure--General Electric Solid State OPTO Electronics--AC Input Photon Coupled Isolator H11AA1-H11AA4, particularly the applications described at p. 233.

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