基于Modbus远程监控的水质在线监测系统的设计与实现

Design and implementation of the water-quality on-line monitoring system based on Modbus tele-surveillance

论文讲述了当前水质监测的重要性以及研究开发的监测设备的特点。重点介绍了监测设备中前方监测设备的组成和所使用的原件型号,前方监控设备的CPU模块控制着水质数据的采集传输。监控中心和前方监测设备按照Modbus通信协议的数据帧格式使用无线电台对数据进行传输。针对性地介绍了Modbus协议,并详细给出了监控中心PC机软件模块组成和工作流程图。试验测试表明,该水质监测系统能够在近距离实现最快2秒每次地将水质和GPS坐标数据传输到本地监控中心,远距离也可以实现10秒每次。使数据采集实现完全自动化,最大化减少人工采集的误差,达到在线实时远程监控水质指标变化的目的。

In nowadays, the environment has already been polluted heavily, especially the water-quality. So the importance of water-quality monitoring and the advantages of the monitoring device used are introduced. In this monitoring device, the components of the spot monitoring device and their models are especially introduced, the CPU module in the spot monitoring device controls the collection and transmission of the water-quality parameters. The monitoring center and the spot device exchange data based on Mdbus protocol by using wireless radio station. Then, the data frame and the communication principle of the Modbus are properly discussed. It also gives the software function module and work flow chart of the computer in the monitoring center. The result of the practical experiment has proved that this water-quality monitoring device can transfer the water quality and GPS coordinate parameters to the remote monitoring center with the fastest frequency-two seconds each time at close range and ten seconds each time at greater distance. This water equality equipment automates the process of collecting and transferring water quality data and minimizes the possibility of human error. This device has achieved the real-time and online water-quality tele-surveillance in the monitoring center.