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【RS-485总线】详解RS-485上下拉电阻的选择
RS-485总线广泛应用于通信、工业自动化等领域,在实际应中,通常会遇到是否需要加上下拉电阻以及加多大的电阻合适的问题,下面我们将对这些问题进行详细的分析。 为什么需要加上下拉电阻? 根据RS-485标准,当485总线差分电压大于+200mV时,485收发器输出 ...
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