Arrangement for checking a contact inserted between a transmitte

Details Arrangement for checking a contact inserted between a transmitte Arrangement for checking a contact inserted between a transmitte

1978-02-06

1979-07-31

Robinson, Thomas A.

Communications: electrical

Digital comparator systems

178 69G, 235302, G06F 1100, G08B 2900, H04L 2502

Patent

active

041632109

ABSTRACT:
An arrangement for checking contact betweena transmitter circuit situated upstream and a receiver circuit situated downstream, the contact being made to enable electrical signals corresponding to 1 and 0 logic states produced by the transmitter circuit to be transmitted in series to an input of the receiver circuit, is characterized in that it is formed by a first circuit situated upstream of the contact at the output of the transmitter circuit and a second circuit which is situated downstream of the contact at the input to the receiver circuit, the first circuit being designed to produce, at a first output connected to the second circuit, and if the contact is satisfactory, a current in a predetermined direction or the opposite direction in the presence of a signal representing a 1 or 0 logic state emitted by the transmitter circuit, the second circuit being designed to generate, at an output connected to the input of the receiver circuit, a signal corresponding to the logic state generated by the transmitter circuit when a current in the corresponding direction is emitted by the first circuit, the first circuit emitting a signal at a second output when the said current is present, this signal thus indicating that the contact is satisfactory.

REFERENCES:
patent: 3500318 (1970-03-01), Arlen
patent: 3633016 (1972-01-01), Walker et al.
patent: 3706987 (1972-12-01), Westphal
patent: 3943348 (1976-03-01), Akriche et al.

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