The Design Of Remote Automatic Control System Of Multi-Instruments

In modern industrial production, a large number of instruments and equipments with different functions in one operating area are scattering geographically, making it difficult for operation and maintenance. In light of this, it is imperative to build up a centralized-monitoring system for instruments and equipments in one operating area. This thesis holds the idea of developing a universal automatic-controlling system on the basis of virtual instrument development. This system will be able to control several instruments and get data from them for computer processing, so that plenty of human and material resources could be saved and the goal of real-time data collecting and monitoring could be obtained.The research work of this paper can be summarized as follows:(1) To know about the GPIB protocol, master the usage of VISA libraries' functions, work out the interface functions of equipments, and develop the function of GPIB interface communication through combining VISA and LABVIEW at the bottom. With help from the friendly man-machine interface which is prepared by using VC++ language, to develop basic data processing functions such as instruments selection, bit-mapped display of instruments, parameter setting and returned parameter display of instruments, graphics display of instruments and data addition, modification and deletion(2) With the convenience in FPGA chip programming and modifying and practicality of this chip, to develop the interface function together with the bus line via primary controller and FPGA through the use of FPGA principle, and to develop the USB interface protocol conversion functions by using Serial-to-Parallel chip. With these two functions, to develop the function of computers' communication with instruments with interfaces of GPIB, RS232 or USB through the USB interface or bus interface.(3) To link this system with the leakage cable coupling loss Auto-test System, through the test of the coupling loss of leaky coaxial cable, to verify the feasibility and utility of this systems in actual production process.