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修改时间 10-21-2019 03:06 AM
双线自动模式下输出的空闲电平是0v,不应该是逻辑高+5V吗？查了些资料说没有偏置电阻，但偏置电阻具体怎么加，查了英文的中文的，没有一个人能说的详细明白。怎么解决这个问题，希望高手解答！
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