单片F330实现信号隔离和远程通讯设计

电气自动化论文编号:ZD329  论文字数:15523,页数:40

 目　　录

一 引言 1
 1.1课题研究的意义 1
 1.2国内外研究现状 1
 1.3课题主要内容 1
二 信号隔离 3
 2.1信号隔离的重要意义 3
 2.2信号隔离器 3
 2.3 ADuM1201数字隔离器 3
 2.3.1 iCoupler®技术与数字隔离器 3
 2.3.2 ADuM1201的结构及特性 3
三 C8051F330混合信号微控制器 6
 3.1结构及主要特性 6
 3.2 CIP-51微控制器 8
 3.3 SMBus串行总线 10
 3.4异步串行通信 12
四 RS485远程通讯 14
 4.1远程通讯概述 14
 4.2 RS485总线 14
 4.2.1 RS485串行接口标准 14
 4.2.2 RS485电气特性 15
 4.2.3低功耗RS485收发器MAX485 16
五 系统的设计与实现 18
 5.1系统硬件设计 18
 5.1.2电源电路设计 18
 5.1.2隔离电路设计 19
 5.1.3远程通信电路设计 19
 5.2系统软件设计 22
 5.2.1 UART0工作方式 22
 5.2.2 串行口AD采集程序 24
 5.2.3 SMBus通信 25
 5.2.4 SMBus与上位机数据通信程序 28
六 结论 30
谢辞 31
参考文献 32
附录 33

摘　　要

 信号隔离与远程数据通信在工业生产中日益发挥着重要的作用。为了适应目前工业现场的复杂环境和分散的工业控制系统，开发一种基于单片机的信号隔离和远程通讯技术已经势在必行。
 本文介绍了八位混合型单片机C8051F330实现信号隔离和远程数据通信。主要阐述了如何利用新型数字隔离器ADuM1201将工业现场的模拟信号进行隔离，并送入单片机进行相应的数据处理。经过通信协议的转换实现了单片机F330的双向串行总线SMBusI/O接口与RS485远程通信网络的数字信号传输。用ADuM1201代替传统的光电隔离器件实现工业现场的信号隔离，相对于传统的隔离方法，降低了系统功耗，简化了系统结构，更增强了系统稳定性。本设计采用了RS485总线，实现了PC对前置单片机系统的远程集中监测、控制和管理，解决了远距离通信的问题。
 
关键词:信号隔离　　C8051F330　　远程通讯　　RS485

Monolithic F330 signal isolation and long-distance communication design
Abstract

 Signal isolation and long-distance data communications in industrial production plays an increasingly important role. In order to adapt to the current site of the industrial complex and decentralized environment of industrial control systems, developing a SCM signal isolation and long-range communications technology has been inevitable.
 In this paper, eight SCM C8051F330 mixed signal isolation and long-distance data communications. Mainly on how to use new digital isolators ADuM1201 industrial analog signal to the scene of isolation and into the SCM corresponding data processing. After the communication protocol conversion to achieve the SCM F330 two-way serial bus SMBusI / O interface with the long-distance telecommunications network RS485 digital signal transmission. ADuM1201 replace the traditional use of optoelectronic devices isolated industrial site signal isolation, compared to the traditional method of isolation, lower power consumption of the system, simplify the structure of the system, enhance the stability of the system. The design used by RS485 bus, and the PC to pre-concentrate microcontroller system of remote monitoring, control and management to solve the long-distance communications problems.
 
 Key words: signal isolation　　C8051F330　　long-distance communication　　RS485