Design And Implementation Of Data Gateway Based On Windows NT

In the conventional design of data gateway, real-time date commonly is dealt with using single-task and serial mode because of the restriction of computer and communication technique. With the development of control system and information system, system scale gradually enlarged Conventional real-time date processing mechanism has not already been fit for practical demand In the passing several years with the development of computer network and communication technique, the ability of data processing and data communication has been advanced largely and a large amount of data can be transmitted in short time. Under this circumstance more efficient method of real-time date processing must be developedThis paper brings forward a method of real-time data processing based on multi-task. It makes best of multi-mask mechanism provided by new operation system -Windows NT. Conventional serial data processing is replaced by parallel data processing for the processing of real-time data. This method enhances efficiency of processing real-time and enhances real-time ability and reliability of system, so it satisfies the demand of a great system.The design of software system of data gateway studied by this paper is implemented under Windows NT. Process and Thread are the most conception in Windows NT. Firstly, chapter 2 introduces the conception of Process and Thread and how operation system creates the kernel object of Process and Thread and operates Process and Thread using correlative kernel object. Secondly, it introduces the different attributes of Process and Thread and some functions using querying and modifying these functions.Windows NT provides ability of network integration and supports TCP/IP > socket Firstly, chapter 3 introduces the origin and development of TCP/IP. Secondly, introduces system structure and specification characteristic, and finally introduces WinSocket communication interface principle based on TCP/IP and pivotal flow of network application system.Programmable controller (PLC) is a new type of industrial controller developed by microprocessor technique, compositive computer and automation technique. It applies to each industrial field. One of data gateway's functions is to communicate with PLC control network. In this paper chapter 4 introducescharacteristic of Siemens CP1613 communication processor and SAPI ?S7 application programming interface.Data gateway mainly accomplishes dynamic data exchange between control network and information network. Firstly, chapter 5 labors partition of multi-task in the system and the communication and harmony between these tasks, Secondly, explains some important techniques and realization details in the process of software modules' design.The data gateway has been applied to the reconstructed item of converter automation system of BenSteel. As a result system runs stably and real-time capability is desirable. It has definite value popularized.