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最近有项目使用到RS485接口，速率要求不高的半双工即可，但遇到A/B口如果增加上下拉电阻后，
单个接口的应用可以计算上下拉阻值，但AB总线上接入多个设备时，由于全部共地，
原设定的上下拉电阻，相当于下拉电阻并联，是否影响AB特性，求高手指点！！
