I have JKBMS with successfully connected RS485 to USB Serial converter. This usb device is visible on HA as device /dev/ttyUSB0.
Is it possible to use this connection instead of Bluetooth? I might be more stable than bluetooth

I have used converters tested by Andy from offgrid garage in this video: https://www.youtube.com/watch?v=sHIlP2oJ3DU