【正文】 造業(yè)技術(shù)的改造是自動(dòng)化技術(shù)與進(jìn)步發(fā)展的主要方向和任務(wù)。RS232C 串行通信在控制領(lǐng)域里應(yīng)用得很廣泛 但在實(shí)際應(yīng)用中又會(huì)因所控制的對(duì)象 所解決的問(wèn)題不同而各具特點(diǎn)，如 PC 機(jī)對(duì)外圍設(shè)備的讀寫(xiě)控件電氣元器件或獲取其狀態(tài)，從而對(duì)各種類型的設(shè)備進(jìn)行自動(dòng)化控制。而通信在自動(dòng)化行業(yè)里不可缺少的環(huán)節(jié)。在設(shè)備自動(dòng)化中,單片機(jī)系統(tǒng)成本低、設(shè)計(jì)方案較靈活,從而節(jié)省工程材料達(dá)到降低成本的目的。 畢業(yè)論文（設(shè)計(jì)）作者簽名： 日期： 年 月 日目 錄（專升本）畢 業(yè) 論 文（設(shè)計(jì)） ..........................................................................................................1【摘要】 ....................................................................................................................................................4⒈引言 ........................................................................................................................................................5 運(yùn)行維護(hù)系統(tǒng)概述 .........................................................................................................................5 串行總線概述 .................................................................................................................................5 串行總線特點(diǎn) ..........................................................................................................................5 串行總線原理 ..........................................................................................................................6⒉開(kāi)發(fā)技術(shù)概述 ........................................................................................................................................6 四層開(kāi)發(fā)結(jié)構(gòu)簡(jiǎn)述 .........................................................................................................................6 物理層 ......................................................................................................................................6 數(shù)據(jù)鏈路層 ..............................................................................................................................7 協(xié)議層 ......................................................................................................................................7 應(yīng)用層 ......................................................................................................................................8 技術(shù)簡(jiǎn)介 .................................................................................................................................9 動(dòng)態(tài)鏈接庫(kù)簡(jiǎn)介 .............................................................................................................................9 .......................................................................................................................10 需求分析 .......................................................................................................................................10 編寫(xiě)的目的及背景 ................................................................................................................10 功能需求 ................................................................................................................................10 系統(tǒng)性能需求 ........................................................................................................................11 系統(tǒng)分析 .......................................................................................................................................11 技術(shù)可行性 ............................................................................................................................11 經(jīng)濟(jì)可行性 ............................................................................................................................11 操作可行性 ............................................................................................................................11 功能模塊劃分 ...............................................................................................................................114 系統(tǒng)的實(shí)現(xiàn) ...........................................................................................................................................12 運(yùn)用 API 函數(shù)實(shí)現(xiàn)串口操作 .......................................................................................................12 串口相關(guān) API 函數(shù)介紹 ............................................................................................................12 運(yùn)行維護(hù)系統(tǒng)中串口操作的實(shí)現(xiàn) ........................................................................................13 通訊協(xié)議的建立 ...........................................................................................................................14 上位機(jī)與下位機(jī)指命解析 ....................................................................................................14 上位機(jī)與下位機(jī)通信操作流程圖 ........................................................................................15 數(shù)據(jù)交換層代碼的封裝 ...............................................................................................................15 用戶界面層的實(shí)現(xiàn) .......................................................................................................................17 打開(kāi)與關(guān)閉串口 ....................................................................................................................17 數(shù)字輸入輸出 ........................................................................................................................17 脈寬調(diào)制 ................................................................................................................................18 數(shù)模與模數(shù)轉(zhuǎn)換 ....................................................................................................................18 電機(jī)控制 ................................................................................................................................19 信息欄 ....................................................................................................................................20 ...........................................................................................................................................206 結(jié)束語(yǔ) ...................................................................................................................................................21【參考文獻(xiàn)】 .