Modbus in IOT2040

After I config and deploy I have the problem "Lost connection to the server, reconnecting" and then I reboot the IOT2040 after this I cannot reach node-red.In IOT2040 hardware config X30 = RS485 and X31 = RS232 I test by Modbus Poll via USB converter RS485 and connect to X30 pin 1,2. Please help me

Help me please

/dev/ttyS2 is not a USB converter.

USB Converter is using on my PC and dev/ttyS2 I using on IOT2040 on X30

Please write in Siemens IOT2000 forum. IOT2040 isn't easy to handle.