Sorry for the late reply checked it with our HQ here is their reply:
You can disable RS485 in WebUI altogether if you are going to connect to the interface directly via CLI. You can use something like this (while RS485 is disabled in WebUI) to connect to your serial device (set your baud rate accordingly):
microcom -s 115200 /dev/rs485
Unfortunately, our binary applications are closed source and we cannot divulge such information.
I hope this clarifies things on your side.