為了減小噪聲干擾產(chǎn)生的誤差,建議使用屏蔽雙絞線。應確保極性的正確,例如保護裝置必須將所有的RS485“+”端子和所有的RS485“-”端子分別連接在-一起。COM端子應連接到屏蔽的公用線(如果提供)上。為避免環(huán)流,屏蔽應單點接地。保護裝置應采用菊花鏈模式相互連接
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