Communication bus system with mitigation of slave station lockin

Details Communication bus system with mitigation of slave station lockin Communication bus system with mitigation of slave station lockin

1994-07-14

1995-12-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, 34082507, 3408255, H04L 1240

Patent

active

054736064

ABSTRACT:
A multistation communication bus system including a plurality of master stations and a slave station for transmitting information from the master stations and slave station using a frame based arbitration process. The master station which wins the arbitration transmits a framewise organized message including locking and unlocking signals for respectively, locking and unlocking an addressed slave station, thus blocking any other master station from accessing the slave station for a duration of multiple frames of the message.
Any other master station, upon detecting this blocking condition, executes a first sequence of retry undertakings at a combined time length that is substantially less than a standard maximum value of the duration. A second sequence of less frequent retry undertakings at a combined time length that is more than a standard maximum value of the duration may then be attempted.

REFERENCES:
patent: 4937816 (1990-06-01), Van Steenbrugge et al.
patent: 5003536 (1991-03-01), Tanaka et al.
patent: 5031175 (1991-07-01), Tanaka et al.
patent: 5128936 (1992-07-01), Van Steenbrugge et al.
patent: 5249182 (1993-09-01), Van Steenbrugge et al.
patent: 5343469 (1994-08-01), Ohshima

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