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介绍了地铁隧道显示系统的组成,采用基于CAN总线的通信网络替代原系统的RS485网络。阐述了新型的CAN网络的特点,使用C_CAN控制器的消息对象机制实现CAN总线网络中的CAN端口节点与各个列显CAN节点的通信,介绍了CAN网络通信程序的设计以及通信出错的检查与恢复方法。实际的数据传输测试表明,CAN总线通信网络完全满足地铁隧道显示系统对数据传输的设计要求,并大大提高了整个地铁隧道显示系统数据传输的可靠性和实时性。
The composition of the subway tunnel display system is introduced. The RS485 network that replaces the original system is based on the CAN bus communication network. The characteristics of the new CAN network are described. The message object mechanism of C_CAN controller is used to realize the communication between CAN port nodes in CAN bus network and various CAN nodes. The design of CAN network communication program and the check and recovery of communication error are introduced method. The actual data transmission test shows that the CAN bus communication network fully meets the design requirements of the subway tunnel display system for data transmission and greatly improves the reliability and real-time performance of the data transmission of the subway tunnel display system.