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客车远程监控系统由监控中心、数据传输网络和车载终端3部分组成,采用GPRS和internet作为数据传输中介,实现车载终端与监控中心之间的数据传输。给出系统整体设计后,重点介绍了车载终端的硬件和软件设计方案。车载终端的上位机通过GPRS模块的一个串口发送AT指令控制GPRS模块与监控中心通信,同时使用单片机通过另外一个串口监控GPRS模块的状态,一旦出现异常就将其复位,保证车载终端始终在线。现场运行证明该系统具有良好的性能。
Bus remote monitoring system consists of monitoring center, data transmission network and vehicle terminal 3 parts, the use of GPRS and internet as a data transmission intermediary, to achieve data transmission between the vehicle terminal and the monitoring center. Given the overall design of the system, the hardware and software design of vehicle terminal is introduced emphatically. The host computer of the car terminal sends AT commands to control the GPRS module to communicate with the monitoring center through a serial port of the GPRS module, and monitors the status of the GPRS module through another serial port at the same time, and resets the GPRS module in the event of an abnormality to ensure that the car terminal is always online. Field operation proved that the system has good performance.