Design Of Embedded Network Terminal In Coal Mine Security Monitoring

The security problem of coal mine has become the focus which the society pays attention to nowadays. In recent years, our country has the coal mine accidents frequently around. According to data report which official announces, the number of deaths caused by the coal mine accidents amounts to 3,786 unexpectedly in 2007. However, our country lacks more effective safety ward precautions, besides supervised regularly by superior departments now. Some small and medium-sized coal mine have serious security risks, and their monitoring equipment is no use but only to meet the inspection. More attention, the coal mine's environment existing many kinds of harmful substances such as carbon monoxide, gas, nitrogen dioxide, sulfur dioxide, dust, is very bad and do much damage to the lives and safety of miners. There is no time to delay to strengthen coal mine security monitoring. This article has designed an embedded network terminal which can upload the scene monitoring data to the regulatory departments through network, and has implemented the security production's real-time monitoring of the small and medium-sized coal mine based on such reality.The embedded network terminal which this article has designed has implemented the Ethernet access with an Ethernet interface chip by using a S3C4510B microprocessor of high-performance and low-cost. It can hang up 110 scene monitoring equipments with CAN bus interface within 10km, and can implement the remote transmission of scene monitoring data by using an independent CAN controller SJA1000 of strong extended capacity. It adopts uClinux embedded operating system with complete TCP/IP protocol stack, and has brought much convenient to application design.This article has completed the hardware circuit design of embedded network terminal, and has implemented the compiler and transplantation of uClinux embedded operating system on S3C4510B. It has designed the driver program of interface device,server and client applications also. According to the test, it has already implemented transparent transmission between the CAN bus network and Ethernet, and has achieved the purpose which can remotely and real-time monitor the security production of the small and medium-sized coal mine.