AXIOMTEK CAPA520 User Manual page 46

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CAPA520 Intel Core
 Serial Port 1 Configuration
Serial Port
Enable or disable serial port 1 on CAPA520. The optimal setting for onboard F81803 SIO
address is 3F8h and for interrupt request address is IRQ4.
COM Port Type
Use this item to set RS-232/422/485 communication mode.
Terminal Mode
Enable the RS-422/485 termination resistor to enhance the signal.
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Processor Family 3.5" Board
AMI BIOS Setup Utility