The problem is solved now,because the TX pin of iCoupler is not soldered well .So the output of TX can't send out.
But I want to know why it shows this kind signal ,what does it mean?
The problem is solved now,because the TX pin of iCoupler is not soldered well .So the output of TX can't send out.
But I want to know why it shows this kind signal ,what does it mean?