【正文】 CAN控制器CAN通信協(xié)議主要由CAN控制器完成。 CAN報(bào)文傳輸在CAN總線的報(bào)文傳輸中有四種不同類型的幀：帶有應(yīng)用數(shù)據(jù)且進(jìn)行傳輸?shù)臄?shù)據(jù)幀、向網(wǎng)絡(luò)請(qǐng)求發(fā)送同一標(biāo)識(shí)符的數(shù)據(jù)幀的遠(yuǎn)程幀、能夠報(bào)告每個(gè)節(jié)點(diǎn)錯(cuò)誤的出錯(cuò)幀、如果節(jié)點(diǎn)的接收器電路尚未準(zhǔn)備好就會(huì)附加延遲傳送的過載幀?？偩€上的數(shù)據(jù)可具有兩種互補(bǔ)的邏輯值之一:主控(dominant)和隱性(recessive)。 (11)用戶接口簡單，編程方便，很容易構(gòu)成用戶系統(tǒng)。 (5)CAN采用非破壞性總線仲裁技術(shù)。在CAN總線的協(xié)議標(biāo)準(zhǔn)、兼容的硬件、軟件處理進(jìn)行詳細(xì)研究的基礎(chǔ)上，一方面在下位機(jī)中利用單片機(jī)、總線控制器和驅(qū)動(dòng)器設(shè)計(jì)CAN智能節(jié)點(diǎn)，實(shí)現(xiàn)對(duì)下位機(jī)實(shí)時(shí)采集的數(shù)據(jù)及其預(yù)處理結(jié)果進(jìn)行數(shù)據(jù)的打包、發(fā)送；對(duì)上位機(jī)的配置命令進(jìn)行接收，處理。第2仲技術(shù)觀點(diǎn)是在微機(jī)保護(hù)技術(shù)成熟并向網(wǎng)絡(luò)化多功能方向發(fā)展的基礎(chǔ)上形成的。設(shè)計(jì)的原則是：凡是可以在本間隔層設(shè)備完成的功能，盡量由間隔層設(shè)備就地獨(dú)立處理，不依賴于通信網(wǎng)和變電站層設(shè)備。這類系統(tǒng)雖然做到了一定程度上的分散(功能分散)，但沒有從整體上來考慮變電站綜合自動(dòng)化系統(tǒng)的結(jié)構(gòu)、一般僅是監(jiān)控系統(tǒng)和保護(hù)系統(tǒng)簡單的相加。該類系統(tǒng)的特點(diǎn)是：系統(tǒng)功能不強(qiáng)，硬件設(shè)備重復(fù)、整體性能指標(biāo)低，系統(tǒng)聯(lián)接復(fù)雜，可靠性低，但其成本低，特別適合于老站改造。1992年5月．電力部組織召開的“全國微機(jī)繼電保護(hù)可靠性研討會(huì)”指出：微機(jī)保護(hù)與 RTU，微機(jī)就地監(jiān)控．微機(jī)錄波器的信息傳送，時(shí)鐘、抗干擾接地等問題應(yīng)統(tǒng)一規(guī)劃并制定統(tǒng)一標(biāo)準(zhǔn)，微機(jī)保護(hù)的聯(lián)網(wǎng)勢在必行。如南京電力自動(dòng)比設(shè)備廠制造的 DJK型集中控制裝置，長沙湘南電氣設(shè)備廠制造的 WJBX型“四合一”集控臺(tái)。當(dāng)前變電站綜合自動(dòng)化設(shè)備技術(shù)發(fā)展迅速，各種措施、技術(shù)趨于完善，但結(jié)構(gòu)龐大、價(jià)格昂貴、各模塊功能相對(duì)單一，對(duì)于新建或偏遠(yuǎn)地區(qū)的變電站、配電所，存在主接線結(jié)構(gòu)簡單、出J線少的情況，要求測控單元一次性投資少、技術(shù)上更具綜合性、靈活性。它的出現(xiàn)為分布式控制系統(tǒng)實(shí)現(xiàn)各節(jié)點(diǎn)之間實(shí)時(shí)、可靠的數(shù)據(jù)通信提供了強(qiáng)有力的技術(shù)支持。關(guān)鍵詞： CAN總線 微控制器 網(wǎng)絡(luò)適配器CAN bus based design of substation monitoring system Absrtact Automation field bus is today one of the hot technology, known as the automation of puter local area network. It was a distributed control system between the nodes achieving realtime, reliable data munications to provide a strong technical support. Substation information and data sharing and the use of reliable, practical and efficient munication networks and protocols, to optimize the function of substation automation system to improve the level of substation automation system. With the continuous expansion of power network and puter monitoring and control technology, the rapid development of fieldbusbased control system will widely used in power system substations. CAN field bus the thesis based on research it in the substation automation system theory and practical methods of measurement and control network for the shortings of traditional design of a CAN bus is posed by the Fieldbus control network, and discussed in detail the CAN bus technology and its implications for substation automation system. Through a single chip microcontroller for the hardware and software design, making the whole substation within the system to achieve reliable munication between devices possible for the eventual unattended substation provides the conditions for the model..Keywords: CAN bus Microcontroller Netword card 目 錄第一章、緒論 9 9 10 10第二章CAN總線簡介 12 CAN的技術(shù)特點(diǎn) 12 連接和傳遞方式 12 CAN報(bào)文傳輸 12 CAN控制器 12 CAN總線系統(tǒng)的一般組成 12第三章、 基于CAN總線變電站監(jiān)控系統(tǒng)的總體設(shè)計(jì) 12 CAN總線節(jié)點(diǎn)（下位機(jī)）設(shè)計(jì) 12 CAN總線節(jié)點(diǎn)（上位機(jī)）設(shè)計(jì) 12第三章、CAN總線節(jié)點(diǎn)（下位機(jī)）設(shè)計(jì) 13 14 12 CAN通信模塊設(shè)計(jì) 14 14 14 CAN總線智能節(jié)點(diǎn)系統(tǒng)軟件設(shè)計(jì) 14第4章 、CAN總線節(jié)點(diǎn)（上位機(jī)）設(shè)計(jì) 14 PC機(jī)與單片機(jī)串口通信的硬件設(shè)計(jì) 14 軟件設(shè)計(jì) 15 PC機(jī)與單片機(jī)串口通信的軟件設(shè)計(jì) 15第5章 、系統(tǒng)的抗干擾措施 13 硬件抗干擾措施 12 軟件抗干擾措施 12參考文獻(xiàn) 13致 謝 14