描述
低电平的开关信号(一些状态干结点信号),数据通信线路(RS232、EIA485等),对低频的脉冲信号的抗干扰能力比上种信号要强,但建议最好采用屏蔽双绞线(至少用双绞线)连接。此类信号也要单独走线,不可和动力线和大负载信号线在一起平行走线。
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