Based On The Web Architecture Of The Remote Virtual Instrument

Virtual Instruments technology combins the computer technology with micro-electronics technology. It is one of the new technologies based on PC, and its idea is "Software are Instruments". With the improvement of network technology, especially the Internet, Virtual Instruments have become network-oriented. Remote Virtual Instruments are Virtual Instruments of network expansion. The Remote Virtual Instruments technology extends the VI's application area to whole Internet/Intranet, and makes the process of acquiring signal, transferring signal and processing signal become a whole unit. On the one hand, we can share many expensive hardware resources, on the other hand, we can extend our test system easily and improve the test efficiency. "Networks are instruments"is a good description of the trend. Considering the test software's universality, maintainability and expansion, the thinking of modularization is adopted, and the universal software framework of automatic test system is designed. On the basis of this framework, the compositive test platform is developped. Whereafter, comparing C/S pattern with B/S pattern, B/S pattern was chosen to be the communication pattern of Virtual Instruments based on network. This paper puts forward the solution of Virtual Instruments based on web, which is practical for remote controling and trouble shooting. The software is the key to the whole design. Generally speaking, the software consists of Vistual Instruments, database and application. Fisrst of all, the paper discusses the development status of Virtual instruments in our country and others, the concept, characteristic, and composing of Virtual Instruments. It also expounds the structure and development environment of Virtual Instruments separately. Secondly, this paper gives a way to constitute the hardware platform with embedded board and interrelated hardware, which can develop PC and embedded board's strong points respectively. It emphasizes on the master plan of system and detail of concrete modules. About the data analysis and data processing, the software flow of common instruments is described. Thirdly, the characteristic of SQL Tookit supplied by NI and the relationship of its functions is analyzed. The procedure of database is given. Moreover, In view of multi-threading technology, the realtime of software is discussed, and the concrete...