基于ARM的数据采集与串口通信应用开发

文档编号:ZD988    文档字数:13226,页数:36

摘  要
 随着现代化工业的飞速发展在工业现场有许多物理量需要监控，用以判断当前机器设备是否正常工作，但是在工业监控的过程中经常会出现这种情况，要么传感器安装后不适宜使用电缆传输信号，再者从经济角度考虑，有线传输施工难度大，安装成本较高；尤其对传输距离是很远时，信号在传输电缆上失真严重，那么对工业控制信号的采集和传输是一个非常重要的课题。与此同时，为连续、安全、平稳生产,增加产量,提高产品质量,相应地对过程信息和控制管理出了更高的要求。
    4-20MA经常用于工业仪表中，比如工业设备中的温度变送器和压力变送器都是用的是4-20MA的电流信号进行传输，抗干扰能力自然不用说，精度也可以得到保证，这些工业仪表其内阻基本可以看作无穷大，在外部阻抗在一定范围内变化时，输出的电流信号不会因为外部阻抗的变化而变化，所以才称之为恒流源。目前问题的关键是没有一种好的方法能够在可靠、精确的基础上采集八路4-20MA信号，以前通常通过运放后进ad进行处理的，现在要采集八路，如果按照以前的做法要保证精度整套电路成本会提高不少。

关键词：数据采集；数据的数字传输

Abstract
 Along with the rapid development of modern industry in the industrial field has many physical needs to be monitored to determine whether the machine work, but in the process of industrial control we often appear this kind of circumstance, or inappropriate use after the installation of sensor signal transmission cable, moreover from economic Angle, cable transmission difficult construction, installation cost is higher, Especially for the transmission distance is far, signal transmission cable in the serious distortion of industrial control signal, and then the collection and transmission is a very important topic. Meanwhile, for the continuous, stable, safe production, increase the yield, improve product quality, accordingly to process information and control a higher request.
 4-20MA often used in industrial instruments, such as industrial equipment of temperature transmitter and pressure transmitter is used is 4 - the current signal transmission 20MA, anti-jamming ability nature, let alone can be guaranteed, precision instrument its resistance of these basic as infinite in external impedance within a certain range, the current signal output impedance is not because of external changes, so called constant-current source. Currently the crux of the problem is not a kind of good method can accurately in reliable, based on the collection, 4-8 20MA signal, usually through the op-amp junior AD of processing, now, if the collection of 8 to ensure accuracy of practice before the whole circuit cost will improve.
Keywords：Data acquisition、data transmission

目 录
摘要.I
AbstractII
1 绪论1
2 总体设计方案2
2.1 系统总体结构.2
2.2 系统硬件结构.2
2.3 系统总体软件流程4
3 信号采集模块7
 3.1 信号采集硬件电路概况.7
4 STM32F103RBT6仿真学习套件和AD模块.9
 4.1  STM32F103RBT6介绍9
        4.1.3  STM32F103RBT6仿真学习套件介绍.12
 4.2  STM32F103RBT6串口通信原理13
 4.3  STM32F103RBT6的ADC转换功能.18
    4.4  本款单片机的低功耗性能19
5 单片机与电脑的通讯.20
 5.1  单片机与电脑的通讯硬件原理框图20
 5.2  通讯协议22
5.3  计算机端的RS-232通信软件设计.23
6 系统的调试..24
 6.1  数据采集部分的调试.24
 6.2  STM32F103RBT6最小版的调试24
 6.3  STM32F103RBT6 的ADC转换功能24
 6.4  数据传输部分的调试.24
 6.3  整个系统调试25
7 总结..26
致谢27

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