CAN總線(CONTROLLER AREA NETWORK,控制器局部網絡)由德BOSCH公司先提出來的,CAN總線是目前工業(yè)界廣泛應用的總線。其特點簡要歸納如下:
廈門岳航計算機工程有限公司
聯(lián)系人:李素云
企業(yè)QQ:2851195446,2851195466
手機:18965423501
座機:0592-5165501
1)CAN控制器工作于多主站方式,網絡中的各節(jié)點都可根據總線訪問優(yōu)先權(取決于報文標識符)采用無損結構的逐位仲裁的方式競爭向總線發(fā)送數據。而利用RS-485只能構成主從式結構系統(tǒng),通信方式也只能以主站輪詢的方式進行,系統(tǒng)的實時性、可靠性較差。
2)CAN協(xié)議廢除了傳統(tǒng)的站地址編碼,而代之以對通信數據進行編碼,其優(yōu)點是可使網絡內的節(jié)點個數在理論上不受限制,加入或減少設備都不影響系統(tǒng)的工作。同時可使不同的節(jié)點同時接收到相同的數據,這些特點使得CAN總線構成的網絡各節(jié)點之間的數據通信實時性強,并且容易構成冗余結構,提高系統(tǒng)的可靠性和系統(tǒng)的靈活性。
3)CAN總線通過CAN控制器接口芯片的兩個輸出端CANH和CANL與物理總線相連,而CANH端的狀態(tài)只能是高電平或懸浮狀態(tài),CANL端只能是低電平或懸浮狀態(tài)。這樣就保證不會出現類似在RS-485網絡中系統(tǒng)有錯誤時會導致出現多節(jié)點同時向總線發(fā)送數據而導致總線呈現短路從而損壞某些節(jié)點的現象。而且CAN節(jié)點在錯誤嚴重的情況下具有自動關閉輸出功能,以使總線上其他節(jié)點的操作不受影響,從而保證不會出現象在網絡中,因個別節(jié)點出現問題,使得總線處于“死鎖”狀態(tài)。
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