现场总线及接口网桥技术在BTM中的应用

Application of Field Bus and Interface Bridge Technology to BTM

为实现车载主机BTM和监控装置间的顺利通信,设计能把CAN和485总线协议相互转换的接口网桥。网桥以89C52单片机为核心,通过CAN控制器对BTM进行配置和监控,同时和监控装置保持通信。在收到来自BTM的数据时,对数据进行处理,并通过485接口发送给列车监控装置。网桥同时对点式信息数据进行记录,以便提取和检查数据。实验结果表明,经过网桥的中转,监控装置成功接收到来自BTM的点式信息。

In order to effectuate the smooth communication between on-board equipment BTM and monitoring and recording device, a bridge which serves as the conversion of the communication protocol between controller area network (CAN) and 485 buses was designed. The bridge, with a 89C52 MCU as its core, configures and supervises BTM by CAN controller while keeping communication with monitoring and recording device. Once data are received from BTM, they will be processed and transmitted to monitoring and recording device via 485 interface. In addition, the bridge records the intermittent balise data so that it is convenient to read and check data. Experimental results show that all messages received by BTM were correctly transmitted to monitoring and recording device by the bridge.