A synchronous serial communication network for controlling single point i/o devices
CA 2126215 C · Owner: Buda, Paul R. · Inventors: Buda, Paul R.; Dowdy, Gary L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A communication system between a programmable logic controller (10) and a network of a plurality of remote input/output repeater modules (12a-12c) uses a synchronous serial communications protocol. The programmable logic controller (10) contains a transmitter module (16) for generating a data packet (21) containing the state of an output device connected to a remote input/output repeater module (12a) coupled to the network. A receiver module (20) receives and decodes a returned modified data packet (30) that indicates the state of input devices connected to the same or other remote input/output repeater modules (12a-12c) also coupled to the network. The remote input/output (12a) …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 17, 1992 and granted August 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.