Data transfer through ArduinoMega

Hi Robin

I have very little knowledge of how electronics work. So I actually don't have any idea how stuff works.
I am trying everything to achieve 'if it works, it works'. Which is not ideal, but I am learning on the way + get a functioning machine.

I have contacted the manufacturer and they are actually willing to disclose some information.
I would need to email them with lists of things I need to know to achieve my goal, the manufacturer will check if it is okay to disclose the information.
Apparently the machine is discontinued, hence they can disclose some info.

Hopefully with their disclosed information, we could tackle this project much easier.

Could you please tell me what information I need from the manufacturer?
It would be greatly appreciated if you could list them.