About 13 years ago, the appearance of the NILabView graphical development environment marked the beginning of the widespread acceptance of the concept of virtual instruments. With the latest version 6.1 of LabView, engineers can use intuitive on-screen graphical aids to quickly create measurement, control, and automation applications. LabView is determined to forge ahead, constantly opening up new areas with instant Web-based control, fast data sharing using XML (Extended Markup Language), and communication with wireless devices.
LabView has a real-time version and prides itself on the rich software drivers available for various instrument suppliers. Numerous companies have adopted this environment to greatly reduce the cost of dedicated test tasks. The most obvious example is VisteonCorp, which uses the LabvVien real-time version for automotive EMC (electromagnetic compatibility) testing, saving nearly nine-tenths of the cost. LabView is installed in the computer on the chassis and connected to the network trunk via Ethernet . The chassis acts like a car's cruise control system. The signals sent by the chassis control the car's attributes such as braking and acceleration. Users can also sit in the car, update the new algorithm of LabView's cruise control system, download it and immediately test it, and feedback in real time.
PXI standard The PXI standard formulated by the PXI System Alliance plays a role in boosting the development of virtual instruments. PXI was proposed by NI in 1997, and aims to seek a compromise between complexity and economy between the PC-based system using GPIB and the VXI system.
At present, there are a large number of commercial software that can run on plug-and-play Windows-based PXI systems: such as LabView, LabWindows / CVI. The advantage is that the card box and card can be standardized, making the configuration more convenient and more flexible. Its cost is also lower than other methods such as the VXI specification that supports VEMbus.
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