Asus TUF Z270 MARK 2 Bios Manual page 49

Intel LAN Controller
This item allows you to enable or disable the Intel LAN controller.
The following item appears only when you set the Intel LAN Controller to [Enabled].
Intel LAN PXE Option ROM
This item allows you to enable or disable the Intel PXE OPROM.
Serial Port Configuration
This item allows you to set parameters of Serial Port.
This item functions only if there is a serial port (COM1) connector on a motherboard.
Serial Port
This item allows you to enable or disable Serial Port.
Change Settings
This item allows you to select an optimal setting for Super IO device.
ASUS TUF Z270 MARK 2 BIOS Manual
49