基于组态的PC机串口通信程序设计.docVIP

东北农业大学学士学位论文 学号： 学生姓名：常明伟 指导教师：董守田 所在院系：工程学院电气工程系 所在专业：农业电气化与自动化 研究方向： 东 北 农 业 大 学 中国·哈尔滨 Dissertation for Bachelor Degree of Northeast Agriculture University No.： Name：Chang Mingwei Supervisor：Dong Shoutian Tutor：Engineering Electrical engineering Major ：Production Automation Direction ： Northeast Agricultural University Harbin·China 摘 要 LabVIEW7.0是NI公司开发的图形化编程开发平台,具备强大的实时数据处理功能与显示功能。通常情况下,在LabVIEW开发环境中进行串口通信使用VISA和ActiveX控件两种方式均可以进行,通过结合实例比较,发现VISA方式只能提供查询缓冲区方式接收数据,这需要占用大量的CPU时间,且实时性不佳。相对而言,使用微软提供的MSCOMM32控件的中断函数处理功能,可以实现中断方式的接收数据。同时,MSCOMM32控件可以单独设置串口的每一个引脚,便于实现高级的用户自定义功能。 本次设计是介绍一种基于LabVIEW 7．0语言的AVR AT90系列PC机与单片机的串口通信技术，在体温检测中得到应用，并取得良好效果。 关键词:LabVIEW;串口;通信;VISA;ActiveX Abstract LabVIEW is the NI company s graphic programming language that is able to fulfill ability on handling real-time data and showing. Generally, either VISA or ActiveX control could realize the communication with serial ports under LabVIEW language environment,but the ways that they received data are different.The way based on VISA receive data only through query buffer of serial ports, so it impropriate a lot of time of CPU and not have good real time capability. In relative terms, the MSCOMM32 control could offer query interrupt function that achieve receive data through querying interrupt. At the same time, the latter could define every pin of a serial port,so the senior users realize the user-defined functions conveniently. We introduce the application of serial port communication technology based on PC machine。 with LabVIEW 7．0 language and AVR AT90 series SCM in body temperature examination．And it has good effect． Keywords:LabVIEW; serial port; Communication; VISA; ActiveX 1 目 录 摘 要 1 目 录 2 1 前言 3 1.1目的与意义 1.2LabVIEW的概念 1.3LabVIEW在串口通信中的成就与发展 1.4要解决的问题 2 硬件电路设计 2.1串口扩展 2.2串口功能的确认 2.3串口线检查 2.4串口参数的设置 2.5在LabVIEW中使用串口 2.