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R88D-UP08HA AC200V 200W現(xiàn)有的RFID防碰撞算法都是基于TDMA算法，可劃分為Aloha防碰撞算法和基于二進(jìn)制搜索BS(Binary search)算法兩大類。Aloha是一種隨機接入算法，這種算法多采取“標(biāo)簽先發(fā)言”的方式，即標(biāo)簽一旦進(jìn)入閱讀器的閱讀區(qū)域就自動向閱讀器發(fā)送其自身的ID，隨即標(biāo)簽和閱讀器間開始通信。在標(biāo)簽發(fā)送數(shù)據(jù)的過程中，若有其他標(biāo)簽也在發(fā)送數(shù)據(jù)，將發(fā)生信號重疊從而導(dǎo)致完全沖突或部分沖突，R88D-UP08HA AC200V 200W閱讀器檢測接收到的信號來判斷有無沖突。如果發(fā)生沖突，閱讀器將發(fā)送命令讓標(biāo)簽停止發(fā)送，隨機等待一段時間后再重新發(fā)起查詢。該算法特點是：算法簡單、便于實現(xiàn)，適用于低成本RFID系統(tǒng)。但是由于該算法的時隙是隨機分配的，當(dāng)大量標(biāo)簽并存時，幀沖突嚴(yán)重。而基于BS算法是通過多次比較，不斷篩選出不同的標(biāo)簽號，時分復(fù)用地進(jìn)行讀寫器和射頻卡之間的信號交換，以一個獨特的序列號識別射頻卡為基礎(chǔ)。R88D-UP08HA AC200V 200W為了從一組射頻卡中選出其中的一個，讀寫器需要發(fā)出一個請求命令，有意識地將射頻卡序列號傳輸時的數(shù)據(jù)碰撞引導(dǎo)到讀寫器上，即讓讀寫器來判斷是否發(fā)生碰撞。如發(fā)生碰撞，則縮小范圍進(jìn)行進(jìn)一步搜索。這類算法雖然識別效率高，但是算法比較復(fù)雜，識別時間較長。本文在二進(jìn)制防碰撞算法的基礎(chǔ)上提出一種改進(jìn)的防碰撞算法。

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R88D-UP08HA AC200V 200W
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R88D-UP12HA AC200V 400W
R88D-UP12LA AC100V 200W
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R88D-UP15LA AC100V 300W
R88D-UP20HA AC200V 750W
R88D-UT120H AC200V 5.0KW
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