发明授权
- 专利标题： Data transmission system and method
- 专利标题（中）： 数据传输系统及方法
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申请号： US247267申请日： 1981-03-25
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公开(公告)号： US4410985A公开(公告)日： 1983-10-18
- 发明人: Seiichi Yasumoto , Hitoshi Fushimi , Jushi Ide , Masakazu Okada
- 申请人： Seiichi Yasumoto , Hitoshi Fushimi , Jushi Ide , Masakazu Okada
- 申请人地址： JPX Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JPX Tokyo
- 主分类号： H04L12/423
- IPC分类号： H04L12/423 ; H04Q9/00 ; G06F11/00
摘要：
A central station and a plurality of transmission stations are connected in cascade by a serial transmission line, and constitute a looped data highway system. The central station controls the whole system. The system allows the transmission station having a data signal transmission request to send out a data signal by means of a normal polling signal, but only the station having sent out the data signal by means of the preceding normal polling signal is allowed to send out the data signal again in response to a retry polling signal.
公开/授权文献
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