AXIOMTEK SBC87842 User Manual page 38

SBC87842 Single Board Computer
 Serial Port 1 (COM1)
Serial Port
Enable or disable serial port 1. The optimal setting for base I/O address is 3F8h and for
interrupt request address is IRQ4.
COM Port Type
These are settings for RS-232/422/485 mode. The default setting for all serial ports is
RS-232. The COM_TERM option appears only if RS-422 or RS-485 mode is selected, see
images below. Use COM_TERM to enable or disable internal 120Ω terminator.
32 AMI BIOS Setup Utility