But I tested 3 or 4 devices with CH340 or CH341 and result is the same - driver in raspbian is wrong. Your HW is probably other so you get success resuts. This eliminated my application (minicom) and I am sure now, that driver for CH340 is realy wrong. And if I send chars less than 20 I get other chars. I press ''a'' and I get ''a'' but if I press ''f" I get "F". I connect raspberry with converter with minicom application with windows PC. But your idea - to check it with minicom - was very good for me. I use serial port from C language and settings for communication are the same for each type of converter - pl2302, FT232RL and of course CH340. I tried to test your advices - stty command was new for me.
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