Thanks for the information. This is really very interesting.
I tried to reach the experts from Neurio. After writing a mail to them, a Customer Support Technical Specialist from Generac (the company, which aquired Nurio in 2019) answered me, that I have to contact Tesla directly, because a separate division of Neurio developed the device.
A hotline guy of Tesla in the U.S. told me, that maybe the firmware of the European version, which I have (3 phases with maximum 32A) may behave different from the U.S./Canadian version (1 phase with maximum 48A). I asked for any documentation. He confirmed, that the U.S./Canadian TWC3 version has RS485 support, but said, that there’s no documentation regarding baud rate, register, … only the Neurio installation guide.