Communication system

Details Communication system Communication system

1985-05-06

1989-11-21

Griffin, Robert L.

Communications: electrical

Continuously variable indicating

With meter reading

34082505, 3408255, 307239, 328154, H04Q 500, H04Q 522

Patent

active

048825808

ABSTRACT:
A communication system comprising a plurality of devices interconnected into a loop and each provided with two pairs of sending and receiving terminals for transmitting signals in directions different from each other. Each of the devices is connected to the other devices immediately adjacent thereto on the loop by a pair of transmission channels connected to the two pairs of sending and receiving terminals and each including a sending line and a receiving line. Each device comprises a first arrival preference circuit which disciminates whether a first or second input terminal receives a signal first. Also, a control circuit causes the terminal which receives the first arrived signal to accept that signal while the other terminal is inhibited from accepting any signals. A predetermined one of the terminals is controlled to accept an input signal when input signals arrive at the two terminals simultaneously. The device is inhibited, by way of a non-sending signal, from transmitting an output signal when one of the two input terminals is accepting a signal.

REFERENCES:
patent: 3634769 (1972-01-01), Sleater et al.
patent: 4276643 (1981-06-01), Laprie et al.
patent: 4339808 (1982-07-01), North
patent: 4403192 (1983-09-01), Willman
patent: 4420695 (1983-12-01), Fisher
patent: 4423384 (1983-12-01), De Bock
patent: 4428046 (1984-01-01), Chari
patent: 4501021 (1985-02-01), Weiss
Using an Optical Highway for Distributed Architecture of Industrial Control Systems, Samuel M. Herb, P. E., pp. 1565-1570 8131 Advances in Instrumentation, vol. 37 (1982) Part 3, Research Triangle Park, N.C., USA.

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