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RS-485波形衰减问题


Hi~ 我最近实验485通讯,测试到一个问题。 问题是我A,B有上下拉电阻680欧姆,AB端接RL电阻为100欧姆,结果输出波形如下: 想请问为什么只有单边波形衰减?

我另外测试没加RL电阻:


上下拉和RL电阻是我额外增加 所以电路图会没有上下拉和RL电阻 发射端电路如下:
设备端电路如下: