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. 05, 1996
Filed:
Sep. 02, 1994
Hisayuki Maruyama, Ebina, JP;
Sadao Mizokawa, Katsuta, JP;
Seiichi Yasumoto, Hitachi, JP;
Ken Onuki, Hitachi, JP;
Hisao Ogawa, Hitachi, JP;
Junji Fukuzawa, Sagamihara, JP;
Toshihiko Uchiyama, Hitachi, JP;
Toshiyuki Murakami, Hitachi, JP;
Osamu Anbo, Hitachi, JP;
Masato Satake, Naka, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Process Computer Engineering, Inc., Ibaraki, JP;
Abstract
A data transmission method and system of a token passing type capable of periodically transmitting cyclic data produced in a station to other stations while enabling a packet data communication with high efficiency and without disturbing the periodicity of the cyclic communication. A token circulation time is set to be shorter than a cycle time for production of the cyclic data where no packet data to be transmitted. Also each station will pass an acquired token immediately to the next station if the station has no data to be transmitted. Thus, at least one station can have a token at least two times during the cycle time to transmit the cyclic data and the packet data. Upper limits may be set to capacities of the cyclic data and the packet data which are capable of being transmitted each time the token is acquired.