Opc-based Embedded Xml Server

In automatic field monitoring and controlling systems, the price of Industry controlling computer is too high and equipments are too ponderous. Facing these problems, the paper puts forward the thinking of introducing embedded system into industry montoring domain, and presents the architecture and the implementation of the OPC-based embedded XML server.The paper firstly introduces OPC's standards, its technological base which includes COM/DCOM groupware models and C0M+ technology, the application of distributed groupware technology in industry automatic field and basic theory, object with interface, and seven criterions of OPC's standards. Then, it says the criterions of OPC XML DA, specifications and buildup of SOAP protocol and its application mode on HTTP. The paper compares ARM with PowerPC which is current popular embedded process cores, analyzes the application places of adopting different core processor, and studies the characteristics and selection standards of embedded operating systems. The emphasis of analysis is the characteristic and application of RTlinux.On the base of above research, the paper mainly achieves the following problems about the frame of OPC-based embedded XML server.1.Designing a hardware circuit which uses current popular AT91RM9200 CPU based ARM9 core made in ATmel corp. and explaining its hardware structure. Studying the Bootloader's structure of RTLinux and induct process, modifying the Bootloader in the base of actual circuit, discussing parameter data's save and process in industry montoring fields, and presenting the software structure of whole software.2. On the base of server, presenting the realization scheme of SOAP SERVER, implementing the analysis of XML wording.Through using SOAP server, we can achieve data transmit across platforms, put through fire wall, and strengthen degree of opening, reapplying and flexible.Through applying OPC-based embedded XML server into industry montoring and controlling fields, we can reduce devices' selection about installation place. It can install the industry montoring devices installed in spots directly without complicated disposing wires, and make the whole systems more simply and more easily to support.