Data processing protocol system

Details Data processing protocol system Data processing protocol system

G - Physics

08

B

354/230.84

G08B 19/00 (2006.01) G06F 13/372 (2006.01) G06F 13/42 (2006.01)

Patent

CA 1116304

ABSTRACT OF THE DISCLOSURE A protocol system for data processing equipment, particularly equipment used in building automation monitoring and control systems for air-conditioning control and monitoring of fire and security points is disclosed having a plurality of stations connected to a data bus, each station having an apparatus for monitoring the traffic on the data bus, calcu- lating its turn to transmit or time slot during which it is permitted to transmit data on the bus and updating its calcu- lated turn or time slot after each station designated to trans- mit in a turn before it has transmitted data. Although each station has a designated time slot during which it may transmit, each time slot is of variable duration depending upon the extent of data to be transmitted. Thus, each station must be capable of calculating its time slot after each previous station has either transmitted or failed to transmit, and this station must calculate its own time slot accurately even though each previous station has transmitted for a variable length of time.

328461

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