发明授权
US4694421A Interface system which selectively provides impedance matching between a
host computer and a control circuit
失效
接口系统，其选择性地提供主计算机和控制电路之间的阻抗匹配
- 专利标题： Interface system which selectively provides impedance matching between a host computer and a control circuit
- 专利标题（中）： 接口系统，其选择性地提供主计算机和控制电路之间的阻抗匹配
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申请号： US617823申请日： 1984-06-05
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公开(公告)号： US4694421A公开(公告)日： 1987-09-15
- 发明人: Tetsu Ogawa
- 申请人： Tetsu Ogawa
- 申请人地址： JPX Chichibu
- 专利权人： Canon Denshi Kabushiki Kaishsa
- 当前专利权人： Canon Denshi Kabushiki Kaishsa
- 当前专利权人地址： JPX Chichibu
- 优先权： JPX58-101250 19830629
- 主分类号： G06F13/38
- IPC分类号： G06F13/38 ; G06F3/00 ; G06F13/40 ; H03H7/38 ; H04L25/02 ; G06F13/00
摘要：
An interface system has a plurality of signal lines connected between a plurality of input terminals of a control circuit and a plurality of output terminals of a host computer. A plurality of resistor elements each have one end connected to a corresponding one of the plurality of signal lines and the other ends connected in common to a second of a pair of first and second terminals. The first terminal is connected to a power source to supply electric power when the terminal pair is short-circuited by a jumper disposed between the first and second terminals. A plurality of diode elements anodes connected to the second terminal of the terminal pair and cathodes connected to the other ends of the plurality of resistor elements. The resistor elements are electrically interrupted without physically removing the resistor elements by opening the path between the first and second terminals.
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