Communication terminal for interconnecting programmable controllers in a loop
Patent 4354226 Issued on October 12, 1982. Estimated Expiration Date: 
October 12, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 12, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3363234 3668649 3680056 3688273 3706974 3781815 3806885 3879710 Data communication system having a large number of terminals Data sharing computer network InventorsAssigneeApplicationNo. 05/960598 filed on 11/14/1978US Classes:709/251, RING COMPUTER NETWORKING709/208MASTER/SLAVE COMPUTER CONTROLLINGExaminersPrimary: Thesz, Joseph M.Assistant: Eng, David Y. Attorney, Agent or FirmInternational ClassesG05B 19/05 (20060101)H04L 12/427 (20060101) H04L 12/433 (20060101) AbstractA communications terminal for use with a programmable controller to permit transmission of status and control information between that programmable controller and a plurality of programmable controllers having similar communications terminals associated therewith and connected in a communications loop. The communications terminal permits one programmable controller to utilize signals originating in other programmable controllers and to provide asynchronous time division multiplexed signals to other programmable controllers via a shielded, twisted-pair conductor to control devices connected to those other programmable controllers. | |
