CC-TDI110 51308394-175

CC-TDI110 51308394-175

CC-TDI110 51308394-175

：祖巧麗

：

據(jù)*從事該項技術(shù)工作的同志講：①RS485通信短距離(800m以內(nèi))的一般可使用無屏蔽的普通雙絞線②干擾較重時可使用帶屏蔽層的雙絞線(屏蔽層空懸/或只一端接地——要與“強電地”特別是“變頻器地”分開)③信號地一般空懸(不接線)，如果接地不好反而不能正常通信。

      多數(shù)網(wǎng)友也是以上這個意見。但也有部分網(wǎng)友認為：應(yīng)將互聯(lián)設(shè)備共地；否則，如果接收端有較高共模輸入，就有可能損壞接收端器件。

多數(shù)情況下，連接RS-485通信鏈路時只需簡單地用一對雙絞線將各個接口的“A”、“B”端分別連在一起，而將信號地空懸——這種連接方法在許多場合是能正常工作的，但應(yīng)注意以下兩個問題：

(1)共模干擾問題：RS-485接口采用差分方式接收輸入信號，并不需要相對于某個參照點來檢測信號，系統(tǒng)只需檢測兩根輸入線之間的電位差就可以了。但人們往往忽視了接收器有一定的共模電壓范圍，RS-485接收器共模電壓范圍為-7～+12V，只有滿足上述條件，整個網(wǎng)絡(luò)才能正常工作。當(dāng)通信線路中共模電壓超出該范圍時就會影響通信的穩(wěn)定可靠，甚至損壞接口。

(2)電磁輻射問題：驅(qū)動器輸出信號中的共模部分需要一個返回通道，如果沒有一個低阻的返回通道(信號地)，就會以輻射的形式返回源端，整個總線就會像一個巨大的天線向外輻射電磁波。

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