The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 1980
Filed:
Jun. 28, 1978
James A Berardi, Highland Park, IL (US);
Darrell Chelcun, Boling Brook, IL (US);
Lawrence J Dressel, Bartlett, IL (US);
Bruce D Westphal, Fox Fiver Grove, IL (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
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, calculating its turn to transmit or time slot during which it is permitted to transmit data on the bus and updating its calculated turn or time slot after each station designated to transmit in a turn or time slot after each station designated to transmit 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.