Virtual Instrument for WinCE Project application (VI)

　　Virtual instrument technology is the use of high-performance modular hardware, combined with efficient and flexible software to complete a variety of testing, measurement and automation applications. The concept of virtual measuring instruments (VI) was proposed by National Instruments Company NI (nationally Instruments) and led to a major change in the field of traditional instruments, enabling the integration of computer and network technologies into the field of instrumentation and instrument technology, thus creating "software as instruments" The precedent. "Software is the instrument" This is the core idea of the virtual instrument proposed by NI company. Starting with this idea, virtual instruments are built on computers or workstations, software, and I/O components. I/O parts can be standalone instruments, modular instruments, data acquisition boards (DAQ) or sensors. NI's virtual instrument products include software products (such as LabVIEW), GPIB products, data acquisition products, signal processing products, image Acquisition products, DSP products and VXI control products. The development of virtual instrument with the development of microcomputer and the use of different bus, can be divided into five types: PC Bus-card-type virtual instrument, parallel-port virtual instrument, GPIB Bus virtual instrument, VXI Bus virtual instrument and PXI Bus mode virtual instrument. See Http://baike.eepw.com.cn/baike/show/word/%E8%99%9A%E6%8B%9F%E4%BB%AA%E5%99%A8.

a long time to before based on wince did a virtual instrument teaching experiment system, which belongs to the sixth bus--lxi (LAN eXtension instrumentation), and the previous bus characteristics compared as shown.

As you can see, the characteristics of bandwidth, connectivity, installation deployment, and distance are all very good in addition to the delay characteristics, which can satisfy most of the application scenarios. WinCE equipment in the entire virtual instrument system is mainly used to collect the signals of each sensor, such as temperature and humidity, pressure, voltage, control signal generator chip to produce a specified frequency of sine wave, square wave and triangular waves, acquisition of high-frequency signal and send data through the network to the pc,pc end of the LabVIEW program responsible for processing and display. In order to operate locally, such as signal generators and multimeter functions, the wince has done a set of procedures, so that the front-end can also work from the PC. The WinCE control interface is shown.

Virtual Instrument for WinCE Project application (VI)