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RS-485、CAN是两种成熟的差分数字串行通讯技术。所谓差分,完整含义是差分数字化(differential digitalization),它是指在一对信号线上,把两条信号线上电平差异的程度定义为二进制0和1这样一种数字编码技术。默认情况下,信号线电平都处于一个平均值附近 ...
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