Switch between IoT2 and DB9 RS232

I use mangoH green. I can switch between UART1 signal to the ATmega32U4 -> UART1 signal to IOT slot, by using hardware swich pin6.
If I wanted to use IoT2 connector instead DB9 RS232, how could I do it?
Another question how can I swich UART1 between Iot0 and Iot1


Hi @TheGod,

I think that question is more for http://forum.mangoh.io