Axiomtek ICO300 - Manual (Page 30)

ICO300 Series U ser’s Manual
AMI UEFI BIOS Utility 22
 Serial Port Configuration
The default setting for all Serial Ports are RS232.
You can change the setting by selecting the value you want in each COM Port Type.
Supports internal 120 ohms terminator in RS422 & RS485 mode.
(Please refer below graphics.)