| The expressway tunnel monitoring system is established for tunnel's safe and reliable operation. It is the surveillance, detection and control system for traffic, environment, aerator, lighting and power supply in the tunnel. It can collect, analyze, judge and make policy for various information in the tunnel in time. To reduce the impact of unforeseen events, it may take proper control measures. And so the traffic is stable, safe and expedite.This thesis is based on the important Science and Technology Project of Chongqing. There are many hills and tunnels in Chongqing. To make full use of the expressway tunnel monitoring system, they want to combine these systems. But there are many control modes and equipments in these systems. The communication protocols in the equipments are different if these equipments are produced in different companies. So the study on communication protocol standardization of expressway tunnel monitoring system is very important.In this paper, this paper introduces the OSI model, the TCP/IP model and the 104 protocol. The framework and demand of communication protocol are analyzed. And then, communication protocol of expressway tunnel monitoring system is devised. At last, the expressway tunnel monitoring system is designed by Microsoft Visual C++ 6.0. The prolonged time is analyzed. Therefore this protocol is reasonable. |
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