DIOS Forth for DuinoMite-Mini uart2

[mobluse]

There is a Forth called DIOS Forth for DuinoMite-Mini:
http://www.forth.cz/Download/DIOSForth/DIOSForth.html

It says it communicates on uart2. DMBasic has 4 com-ports. Which port does uart2 in DIOS Forth correspond to in DMBasic, COM2 or COM4?

I think it would have been easier if it had used the USB-port as a serial-port. It would have been even better if there was a Forth that could use VGA or CV, and keyboard.