文档介绍：论文题目基于单片机的RS485总线采样节点设计与实现
姓名周群丰
学院东北大学东软信息学院
专业电子信息工程(嵌入式系统工程方向)
指导教师闫慧琦讲师
备注
2011 年 5 月
毕业设计(论文)任务书
毕业设计(论文)题目:
基于单片机的RS485总线采样节点设计与实现
设计(论文)的基本内容:
本设计是基于单片机采集温度采样值,再通过RS485总线传送到基于ARM的那个RS485节点上,从而实现采集温度并通过RS485传送。
毕业设计(论文)专题部分:
题目:
设计或论文专题的基本内容:
学生接受毕业设计(论文)题目日期
第 1 周
指导教师签字:
2010年 11月 29 日
基于单片机的RS485总线采样节点设计与实现
摘要
本论文介绍了基于RS485串行总线标准的温度采集系统的硬件和软件设计。温度数据的采集由以AT89S52单片机为核心的系统完成,采集的数据经RS485串行总线上传给ARM微处理器进行存储和处理。系统的软件包括单片机程序和计算机程序,分别应用C语言编写。相应的硬件和软件抗干扰措施保证了系统的稳定性和可靠性。本文介绍了一种基于RS-485的单片机与ARM之间文件传输的实现方案。给出了RS-485驱动程序的设计方法,详细阐述了自定义通信协和实现程序。
在传统模式下的温度测量采用热电偶或热敏电阻,其输出是模拟信号,必须转换成数字信号,然后与单片机进行传输。因此,它是相当复杂而且成本高。近年来,美国生产的DS18B20,作为一种新的单总线数字温度传感器被广泛使用。在前台实时温度数据采集和转换,通过传感器DS18B20的数字式分为单片机发送给LED显示模块。此外,接收温度数据通过RS - 485接口传送到后端的ARM中显示。
关键词:AT98S52, RS485,温度采集,串行通信
Design and realization of the RS485 node sampling based on MCU
Abstract
The hardware and software design of the temperature acquisition system based on RS485 munication criterion is introduced. The acquisition of temperature data is finished by the system taking AT89S52 MCU as core. Collected data can be sent up to ARM through RS485 serial bus, stored and processed in it. The software of this system includes MCU and ARM pro-grams, programmed with C language. Some corresponding software. And hardware anti -disturbance measures assure this system’s stability and reliability. The implement of the file transfer between MCU and ARM based on RS-485 are introduced in this paper. The design method of the RS-485 driver is given. The user- munication protocol and the program are discussed in detail.
Under the traditional model of the traditional temperature measurement using thermocouples or thermistor, the output is an analog signal, must be converted into a digital signal and then transmitted with the microcontroller. Therefore, it is plicated and costly. In recent years, . production of DS18B20, as a new single-bus digital temperature sensors are widely used. Real-time temperature data collec