Communications: electrical – Continuously variable indicating – With meter reading
Patent
1986-03-11
1989-03-07
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
340825140, 340825210, 340825520, H04Q 900
Patent
active
048110159
ABSTRACT:
A circuit for detecting an abnormal transmission state on a signal transmission line, the abnormal state being such that a short-circuit or open-circuiting occurs in the signal transmission line, applicable to a time-division multiplex transmission network system having an address clock line and a data transmission line. The circuit includes a first latch circuit, which is set by a trailing edge of a data receivable interval specification pulse to a state indicating no presence of the specification pulse, wherein the specification pulse is derived from an address coincidence circuit constituting one data receiver of the network system. The first latch circuit latches the state of presence or absence of the specification pulse on a trailing edge of a start bit constituting data to be received. The circuit further includes a second latch circuit which is initially set to a state indicating the state of the presence of the specification pulse and which latches the state of presence or absence of the specification pulse latched in the first latch circuit at a time when a duration of the specification pulse continues and which operates with a slight delay with respect to the appearance of the trailing edge of the start bit on the data transmission line.
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Abe Noriyuki
Okada Kazuyoshi
Nissan Motor Company Limited
Yusko Donald J.
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