Serial data transmissions device and terminal unit for the same

Details Serial data transmissions device and terminal unit for the same Serial data transmissions device and terminal unit for the same

1994-08-01

1996-04-16

Chin, Stephen

Pulse or digital communications

Testing

With indicator

375224, 370 14, 34081517, H04B 346

Patent

active

055090290

ABSTRACT:
A serial data transmission device has a master unit, plural terminal units, and an abnormal detection unit connected by a signal line. Each terminal unit has an allocated address. The master unit interchanges data with each one of the plural terminal units in sequence. Each interchange of data with one terminal unit constitutes a cycle. Each terminal unit counts the number of data cycles of the master unit. When a terminal unit detects its assigned cycle number in the total sequence of cycles, a confirmation signal is output to the signal line. The abnormal detection unit determines the presence and location of an abnormality in accordance with the absence of a confirmation signal from a particular terminal.

REFERENCES:
patent: 4149144 (1979-04-01), Diefenderfer
patent: 4161635 (1979-07-01), Wolaver
patent: 4227181 (1980-10-01), Brittain
patent: 4293947 (1981-10-01), Brittain
patent: 4586040 (1986-04-01), Akiba et al.
patent: 4679192 (1987-07-01), Vanbrabant
patent: 4841520 (1989-06-01), Steely

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