| Real-time monitoring systems are very important and widely used in industryand military field, they are also the hot issues in recent research. With thecontinuous development of computer and network technology, real-time systemshave become more powerful in functions, more various in realization and highercost performance. Especially with the help of network virtual instrument, thefieldwork of data acquisition not only becomes a real-time operation but also solvesthe problem on real-time remote transmission of data. These technologies haveprofound meanings towards improving the ability in measuring and control field ofour country.This subject aims at increasing the real-time performance as a fundamental,combining with the powerful ability of human-computer interaction of virtualinstrument,develop a real-time system based on LabVIEW and RTX. Moreover, invirtue of flushbonading and networking virtual instrument technology, the thesisdevelops a flushbonading Ethernet communication module, it also has achievedcommucating with LabVIEW.Compared with most other reat-time systems, thisdesign compensates the weakness of some other troductional real-time systems instrong specificity, poor universality and expansibility.First, presenting some methods about enhancing the real-time performance inWindows system,focusing on the study on improving the real-time performancewith RTX.Building a real-time monitoring system based on LabVIEW andRTX.RTX is in charge of the expansion of reat-time, LabVIEW is in charge of thedevelopment of human-computer interaction, while by means of DLL andsharedmemory, the thesis solves the data exchange problems in two diffierentsubsystems of RTSS and Win32. On the aspect of data exchange, Bringing out twomethods, synchronous and asynchronous communication, to solve the problem,andachieving the goal in the end. In the synchronous method, fullfill RTXcommunicating with LabVIEW, jump the procedure of commucating through DLL,by means of using the serial ports programming in the computer,meanwhilecompare the two methods’ performance. In all, the system realizes real-time dataacquisition,then complete the dynamic data presentation,data storage andacquisition control by LabVIEW.In addition, according to diffierent requirements,on the basis of DSP+FPGADAQ device already exist,develop an Ethernet communication module based onTCP/IP protocol,which is consist of DSP and the hardware protocol stack chipW5300. This module can make the information tranfer from the acquisition spot toLabVIEW upper monitor through the wireless network in time, so that can display, save and analyse data.Finally the system expands the network in LAN via the TCP module ofLabVIEW. Make a actual test for the real-time monitoring system,use the tool inRTX to evaluate the performance of the system.Test the network function of theEthernet module, the result indicates that this network is appropriate for low speedcommunication. The actual test shows that the system meets the demand in real-time performance, and makes a proof that the method is feasible. |
