Asus AAEON BOXER-6638U-H1 User Manual page 48

Select a resource setting for Super IO device.
Mode
Configure COM operated as RS232, RS422 or RS485. Only COM2 and COM3 support
this function.
Chapter 3 – AMI BIOS Setup
IO=2E0h; IRQ=3,4,5,6,7,10,11,12; DMA
IO=2D0h; IRQ=3,4,5,6,7,10,11,12; DMA
IO=2C0h; IRQ=3,4,5,6,7,10,11,12; DMA
RS232
RS422
RS485
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