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结合工业测控通信系统的需求,设计了CAN的高层协议——CHP协议。通过初始化帧实现了地址的动态分配与帧格式的约定,采用节点分类和定期查询的方法实现了节点状态的监控。针对大块报文重传效率较低的问题,提出了集中应答和选择性重传错误帧的解决办法;针对大块报文可能导致较大延时的问题,设计了实时报文的抢占机制。
Combined with the demand of industrial measurement and control communication system, CAN protocol designed high-level agreement - CHP protocol. Through the initialization frame, the dynamic address assignment and the frame format agreement are realized. The node status is monitored by node classification and regular query. Aiming at the problem of low packet retransmission efficiency, this paper proposes a solution to the problem of centralized acknowledgment and selective retransmission of error frames. Aiming at the problem that large packets may lead to large delay, a real-time packet preemption mechanism is designed .