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由通信链路连接的多个微计算机,每个计算机都有自己的存储器和外部设备,这些计算机不分享某个计算机的硬件或软件资源,它们既可独立工作,电可以相互通讯完成信息交换任务,这就是分布式系统。铁路的遥控遥信控制设备是沿铁路线分散设置的,属于分布式的控制系统。在铁路多微机分布式系统中,共享一条专用的通信信道。系统中一个点上的计算机被指定为总机,其余点上的计算机被指定为分机。任一时刻只允许一个计算机占用信道,且只能由该节点发送信息,采用半双工的数据传输方式。从这样一个实际情况出发,通信协议既可
Multiple microcomputers connected by a communications link, each having its own memory and external devices that do not share the hardware or software resources of a computer and which can work independently and communicate with each other to complete the information exchange task This is a distributed system. Railway remote telecontrol equipment is distributed along the railway line set, which belongs to the distributed control system. In the railway multi-computer distributed system, share a dedicated communication channel. The computer at one point in the system is assigned a switchboard and the computers at the remaining points are assigned as extensions. Only one computer is allowed to occupy a channel at any one time, and only the node can send information and use half-duplex data transmission. From such a practical situation, the communication agreement can be