Daisy-chain bus system with truncation circuitry for failsoft bypass of defective sub-bus subsystem
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
May 20, 1987
filing date -
May 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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