Research Of Long-distance Monitoring System On Container Crane On The Basis Of WLAN

With the international trade increasing quickly, container transfer in our country shows a good tendency. As the key equipments of a terminal, container crane is an importance part in increasing working efficiency in a terminal. So its malfunctions must be discovered, forecasted and removed in time. Nowadays, domestic research is not in-depth in the field of the long-distance monitoring system on container crane. According to actual requests and objective situations, combined with Modern WLAN (Wireless Local Area Network) technology and Modern Network technique, this paper researches the long-distance monitoring system on the running status of container crane.Firstly, On the basis of the selecting principle of equipment parameters, this paper analyses and picks out the monitoring parameters of running-status of container crane.Secondly, this paper analyses data-delivering method , data-transmitting format and fault-control technology, studies and picks out Direct Sequence Spread Spectrum , accessing point network topology and the IEEE802.11b network rule, On the basis of which the harbor wireless communication system model is established. Each composing part of the system's model is given out. the choice of hardware equipments and the design of communication software are expounded. OOP (Object Oriented Program) method is adopted as programming tool for the communication program, which is worked out by ActiveX technique and holds friendly interfaces.Thirdly, this paper studies the long-distance monitoring system, which is on the basis of Web, discusses the special advantages of ASP technique in the long-distance monitoring system and puts forward the idea that uses ASP technique to realize the monitoring system on container crane. Harbor Intranet net long-distance monitoring system is divided into four parts, including data acquirement & disposing, data delivery, data store and display on the central computer, program design of Web pages on the server. This paper adopts 32 channels analogy collecting card (PCL-813) to acquire container crane parameters, and makes use of ADO and graph technologies of Visual C++ torealize data store and display on the central computer. The Web page design on the Web server is realized through the ASP technique.Finally, the imitating experiments of the long-distance monitoring system on container crane on the basis of WLAN are done. The experiments shows that the system's function is strong, its real-time characteristic and stability is good, its anti-interference ability is strong and this system is suitable for engineering application.