Asus STRIX Z270E GAMING Bios Manual page 48

Serial Port Configuration
Allows you to set the parameters of Serial Port.
This item only functions if there is a serial port (COM1) connector connected to the
motherboard.
Serial Port
Allows you to enable or disable Serial Port.
Configuration options: [On] [Off]
Change Settings
Allows you to choose the setting for Super IO device.
Configuration options: [IO=3F8h; IRQ=4;] [IO=2F8h; IRQ=3] [IO=3E8h; IRQ=4]
[IO=2E8h; IRQ=3]
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ASUS STRIX Z270E GAMING BIOS Manual