摘要
被动接收型串口通信的特点是下位机不断地向上位机发送数据,而上位机在不知道下位机何时发送的情况下被动接收。研究LabVIEW被动接收型串口通信的应用问题,并根据被动接收型串口通信的特点,设计2种应用于串口数据的采集系统。其中,轮询串口通信系统采用循环结构不断查询缓冲区来读取数据,为解决串口数据有时接收不全的问题,该系统先将所有的串口数据全部接收到临时文件,然后再读取临时文件,获得数据;触发串口通信系统则是通过共享变量与外界通信,改变共享变量的值来分别触发串口来获得数据,可避免因使用循环结构不断查询所有串口数据缓冲区而占用大量系统资源的问题。两系统只需设置相应串口参数即可显示、回放和实时存储由硬件采集的数据,方便以后对采集数据进行研究。实验结果表明,系统的稳定性和可靠性较高。
The characteristics of passive receiving serial communication are the lower machine is always sending data to upper computer, but the upper computer receives data passively in the case of not knowing when the machine sending data. This paper studies the application of passive receiving serial communication based on LabVIEW, and designs two serial collection systems for data acquisition on the basis of the characteristics of passive receiving serial communication. Polling serial ports communication can obtain data by using the loop structure querying buffer continuously. Because of the incomplete received date at times, the system saves all the data received from upper computer to temporary files, and we can obtain data by reading the temporary files. To prevent using the loop structure querying buffers of all the serial ports continuously, which result in the waste of the system re- sources, triggering serial ports communication can obtain data by communicating with outside through shared variables, and trigger serial ports separately by the change value of shared variables. Only need to set some serial port parameters, the two systems can display, playback and real-time storage the data collected by hardware, and can provide convenience for the future research of the collected data. The actual experiment verifies the system is stability and reliability.
出处
《计算机与现代化》
2013年第11期100-103,共4页
Computer and Modernization
关键词
LABVIEW
被动接收型
轮询串口通信
触发串口通信
共享变量
LabVIEW
passive receiving
polling serial ports communication
triggering serial ports communication
shared variables
