485 communications in receiving interrupt to send and receive data, send A byte of data with serial debugging assistant, as high as 8, 9, A, B, C, D, E, F return data show that 0,1,2,3,4,5,6,7,
But 8 or 9, A, B, C, D, E, F in the low normal display as 8, 9, A, B, C, D, E, F, this is what reason, how should solve

CodePudding user response:

Solved, later found to be an interface to the hardware, 485 communication lines A, B backwards, so appear this phenomenon, then it turned regular after he switch,

CodePudding user response:

Which is arguably the specific hardware interface? I also met the same situation

CodePudding user response:

refer to the second floor tzwwanyuanhu response:

which is arguably the specific hardware interface? I met the same situation also

Is A from B, B received; Instead of A pick A, B by B