Daisy-chain bus system with truncation circuitry for failsoft by

Details Daisy-chain bus system with truncation circuitry for failsoft by Daisy-chain bus system with truncation circuitry for failsoft by

1987-05-20

1989-07-25

Williams, Jr., Archie E.

Boots, shoes, and leggings

370 85, 3642602, 3642608, G06F 300, G06F 1300, G06F 1342, H04J 302

Patent

active

048520438

ABSTRACT:
A plurality of data transmitting and receiving devices (1) are inter-connected by an interface bus system configured as two or more sub-bus systems (2,3,4) connected into a chain by a corresponding number of communication links (5). Each sub-bus system (2,3,4) includes a communications arrangement (7) interfacing the sub-bus system with the associated link or links (5). The overall interface bus system operates in accordance with a data transfer protocol that involves a handshake procedure requiring the participation of all active devices (1) connected to the bus system. In order to avoid the whole installation locking up upon one sub-system (3,4) becoming non-responsive, each communication arrangement (7), other than the one associated with the last sub-bus system (4) in the chain, is arranged to check the responsiveness of its down-chain neighbour when requested to do so by a control input from the installation controller (1A). In the event of the down-chain system being unresponsive, the communications arrangement (7) functionally truncates the chain at its sub-bus system.

REFERENCES:
patent: 4451886 (1984-05-01), Guest et al.
patent: 4675865 (1987-06-01), DeVries et al.
patent: 4680753 (1987-07-01), Fulton et al.
patent: 4683563 (1987-07-01), Rouse et al.
patent: 4719621 (1988-01-01), May

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