I have consulted this question before, but I feel that there has been no suitable answer. 485 In the 2 wire auto mode in half-duplex mode, when the line is idle, that is, there is no data transmission, the voltage difference between AB on the line is less than 200mv. But this will cause the line to receive the wrong data when receiving interference. How to make the voltage difference between the idle states between AB in the 2 wire auto mode greater than 200MV, and there is no explanation for this problem in the official manual.In the attachment,the problematic.jpg is the waveform of the board in the 2 wire auto mode, and the other is the 485 waveform output by other boards.
