Description
高电平时接成形式,低电平输入时接成形式。图2(c)为差动型接法,它具有两个约束条件,对于防止干扰有明显的优越性,适用于外部干扰严重的环境,当外部设备电流较大时,其传输距离可达100~200m,图2(d)考虑到COMS电路的输出驱动电流较小
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