I just tried it here on both Windows 10 and Ubuntu with no issues. I can print every value from 0 to 255 from arduino and receive it unchanged in pd. I think possibly the OP is using an older version of comport.

Martin

On Tue, May 14, 2019 at 10:03 AM IOhannes m zmoelnig <zmoelnig@iem.at> wrote:

On 14.05.19 15:47, Ingo wrote:
> Could it be possible that the operating system does this even before it gets
> to the comport object?

well, those flags are supposed to control exactly what "the operating
system does" in this respect.

fgmasdr
IOhannes

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