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:
Mar. 22, 1994
Filed:
Jan. 10, 1992
Noboru Takahashi, Aichi, JP;
Noriyuki Hattori, Aichi, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A transmission system formed by a master station and a plurality of satellite stations which are connected by a transmission line into a loop, the data and command signals from the master station being passed sequentially from station to station around the loop. A failure in a satellite station that prevents further loop transmission is detected by watchdog timers in one or more successive stations. As a result, the stations detecting the failure switch themselves into a bus-mode of operation, the master station switches itself and the remaining stations into the bus-mode of operation. The switching back to the loop-mode of operation can be performed under control of the master station automatically, upon detection that the failure has been corrected. The switching also can be performed under external command.