基于89C52的多通道采集卡的設(shè)計(jì)

電子機(jī)電論文編號(hào):JD525 論文字?jǐn)?shù):18198,頁(yè)數(shù):33  

目  錄
1 緒論 1
1.1引言 1
1.2數(shù)據(jù)采集技術(shù) 1
1.3數(shù)據(jù)采集器概述及組成 1
1.4當(dāng)前國(guó)內(nèi)外數(shù)據(jù)采集器的現(xiàn)狀 2
1.5研制隔離多通道高精度數(shù)據(jù)采集器的意義 3
1.5.1多通道采集卡的應(yīng)用領(lǐng)域 3
1.5.2研究意義 4
1.6 課題的提出 4
1.6.1課題的要求 4
1.6.2系統(tǒng)特點(diǎn) 5
2數(shù)據(jù)采集卡的硬件設(shè)計(jì) 6
2.1各模塊功能的實(shí)現(xiàn) 6
2.1.1 CPU模塊的實(shí)現(xiàn) 6
2.1.2 A/D轉(zhuǎn)換模塊 11
2.1.3復(fù)位電路模塊 15
2.1.4通訊模塊 16
2.1.5電源控制電路 18
2.1.6系統(tǒng)時(shí)鐘 19
2.2系統(tǒng)的詳細(xì)原理圖 19
3軟件設(shè)計(jì) 20
3.1 A/D轉(zhuǎn)換 20
3.2標(biāo)度變換 21
3.3數(shù)制轉(zhuǎn)換 22
3.4鍵盤(pán)程序 23
3.5 LED顯示程序 23
3.6通信程序設(shè)計(jì) 23
3.6.1上位機(jī)軟件結(jié)構(gòu)和程序 23
3.6.2下位機(jī)軟件結(jié)構(gòu)和程序設(shè)計(jì) 24
3.7冶金性能數(shù)據(jù)采集系統(tǒng)通訊網(wǎng)絡(luò)的設(shè)計(jì) 25
結(jié)束語(yǔ) 27
致 謝 28
參考文獻(xiàn) 29
附錄:原理圖 30

摘  要

該論文詳盡的闡述了基于89C52的多通道數(shù)據(jù)采集卡的設(shè)計(jì)原理和過(guò)程，采用Atmel公司生產(chǎn)的89C52單片機(jī)作為微處理器，以數(shù)/模轉(zhuǎn)換器MAX197作為A/D轉(zhuǎn)換器件，使數(shù)據(jù)采集精度達(dá)到0.1%FS。論文所設(shè)計(jì)的采集卡具有8個(gè)通道，通過(guò)單片機(jī)編程選擇所需通道的電信號(hào)進(jìn)行采集。每個(gè)通道的電壓測(cè)量范圍可以從0V到5V，單通道采集速度可達(dá)100kSPS。在89C52基礎(chǔ)上還擴(kuò)展了顯示接口、A/D轉(zhuǎn)換模塊、通訊模塊等模塊功能。另外，根據(jù)系統(tǒng)硬件結(jié)構(gòu)、功能要求以及89C52的各個(gè)功能模塊的特性編制了外部中斷程序、定時(shí)器控制程序、通訊程序；通過(guò)RS-232和RS-485 接口與計(jì)算機(jī)連接進(jìn)行數(shù)據(jù)傳輸，使用Delphi 6.0編制了上位機(jī)通訊軟件，繪制了擁有實(shí)時(shí)數(shù)據(jù)采集和動(dòng)態(tài)采樣曲線等功能的顯示界面；并用匯編語(yǔ)言對(duì)下位機(jī)的數(shù)據(jù)采集程序，接收和發(fā)送程序進(jìn)行了編譯。實(shí)現(xiàn)了上位機(jī)與下位機(jī)的通訊。最終利用Protel.dxp軟件印制仿真電路板，對(duì)系統(tǒng)進(jìn)行調(diào)試，分析并解決了系統(tǒng)在應(yīng)用中所出現(xiàn)的問(wèn)題。

關(guān)鍵詞：數(shù)據(jù)采集；89C52；通訊

Abstract

In this paper，the research of the principal and process of the data-sampling card which is based of AT89C52 is expatiated in detail．The text uses MAX197 as an A/D converter and the precision of the acquisition can reach 0.1%FS .The instrument has eight channels，it can selects an electrical signal in one certain channel via using SCM programming.The voltage sampling scope of each channel can be from 0V to 5V,and the speed can reach 100kSPS when collecting with only one channel.The use of 89C52 microprocessor is to design a small-scale data-acquisition system, which includes keyboard module, show module, A/D module, and communication module. The data is transmitted to computer by isolated RS-232 and RS-485 interface. Delphi 6.0 is used to workout the software to achieve the target of communicating between the PC and the chip.What is more,a show interface ,which have some functions such as instantaneous data sampling and dynamic sampling curve, is protract by the software.Besides,compilation language is used to program the chip,including data sampling program,incepting program and sending program. Finally we use Protel DXP to print samulink PCB board and adjust the speed, And debug the system ,analyzing and solving the problem which appears in the procedure in debugging .

Keywords: Data-acquisition；89C52；Communication