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我把SDO出来的线割断,在割断的位置重新在上面焊接6.8nh和75R电阻和75R上拉的部分(原来远处的RL并联电路不焊接,只焊0R电阻),可以正确的传输数据。
原本RL并联放在远处,出来的数据很多是错误的(下端接收芯片有数据校验)