Ok I think that you are taking this in a bad way. If you can’t, or not understand, the question because I didn’t explain the this in the correct way for you, you can ask and I will always answer as well as I can, first at all because I am writing in a language that is no my language, is not necessary be rude. I am an engineer, I know perfectly how to do smart questions. If you don’t want to answer because I think that you are lose your time with me, I understand it, but not be rude
I didn’t say the machine before, because it is not relevant, work with simple serial communication, I did it in other systems, but It my first time with arduino and I don’t know how it work. For more information the printer has other arduino mega inside, the bridge would be:
Pc------------Arduino Mega 2560–USB host shield------------Arduino mega 2560
PS: I didn’t mean to be rude in my answer, but ,because is not my language, I think that is possible that it sound like that. Among other things because you are trying to help me
Thanks for all