Hi Nicolai, thanks for your response.
It is confusing, because in the latest schematics there is a 120 Ohm resistor that is driven by RS485_TERMINATION (GPIO41)

downloads -> schematics -> RevPi Connect -> RevPi Connect S:
https://revolutionpi.com/fileadmin/downloads/schematics ...

I've got the same problem. I first discovered this documentation:
https://revolutionpi.com/en/docs/revpi-connect-s

Then I compiled that C script (after installing the build tools):
https://gitlab.com/revolutionpi/rs485_config

Then I discovered this Python script mentioned in this thread.

All ...