Dual master implied token communication system

Details Dual master implied token communication system Dual master implied token communication system

1989-12-26

1991-01-29

Weldon, Ulysses

Communications: electrical

Selective

Having indication or alarm

340825060, 340870160, H04Q 900, G08B 2100

Patent

active

049889907

ABSTRACT:
A pair of master units share a common communication link to communicate with one or more slave units. Each slave unit transmits a message only in response to a message from one of the master units. When an initial transmission request is received by a master unit, it monitors the communication link and only initiates transmission of a message when the link has been quiet for a link quiet time period. After completing a transmission of a message, the master unit waits a link grant time period before transmitting again to permit the other master unit an opportunity to transmit a message if it desires. Synchronization of the two master units, therefore, is achieved quickly and with minimum overhead.

REFERENCES:
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4139737 (1979-02-01), Shimada et al.
patent: 4332027 (1982-05-01), Malcolm et al.
patent: 4403297 (1983-09-01), Tivy
patent: 4520488 (1985-05-01), Houvig et al.
patent: 4719616 (1988-01-01), Akano

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