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So, now that you're using the correct header, it is telling you that the termios related functions expect a file descriptor (not a stdio stream pointer) as their 1st argument. What have you done to...

I am very glad that it works for you! :)

...but you should not be using stdio for device files! I used open/read/write/close for a reason!

stdio is just not meant for that. At the very...

I'm sure it's just an error with my modification to the command. I think the ? may be an error indication. It would help to know what type of scale it is. Does it work with 'W\n' or 'W\r\n' in printf?

Which one is NO or is this not_applicasble/neither?

Those parameters you display seem to be /dev/ttyS0 not the scales.

Next task is to research the model type of the scales and see if there are...