公开(公告)号：US4675864A

公开(公告)日：1987-06-23

申请号：US740949

申请日：1985-06-04

申请人： Genevieve M. Bliek ,  Kent W. Luehman

发明人： Genevieve M. Bliek ,  Kent W. Luehman

IPC分类号： G06F13/00 ,  G06F13/42 ,  H04J3/02 ,  H04J3/16

CPC分类号： G06F13/4213

摘要： A serial bus system in which frames are sent from a central station to a plurality of substations over a first conductor and information is sent from the substation to the central station over a second conductor. Each transmitted frame contains bits identifying whether it is for address, data or a command. An addressed substation sends a handshake back to the central station by changing the logic level of the second conductor. An address frame contains a bit indicating whether a message is to be written into a register of a substation or read from a register therein. Any substation can interrupt to request service from the central station by changing the logic level of the second conductor if the last command on the first conductor is an unaddress command indicating the end of a message.

摘要翻译： 一种串行总线系统，其中帧通过第一导体从中心站发送到多个变电站，并且信息通过第二导体从变电站发送到中心站。 每个发送的帧包含标识其是否用于地址，数据或命令的位。 一个寻址的变电站通过改变第二个导体的逻辑电平将握手发送回中心站。 地址帧包含一个位，指示消息是要写入变电站的寄存器还是从其中的寄存器读取。 如果第一导体上的最后一个命令是指示消息结束的非地址命令，则任何变电站可以通过改变第二导体的逻辑电平来中断请求来自中心站的服务。