Acnodes OPC 8190 - Manual (Page 38)

 SuperIO Configuration
You can use this screen to select options for the SuperIO Configuration,
and change the value of the selected option. A description of the
selected item appears on the right side of the screen.
 Serial Port1 Address
This item specifies the base I/O port address and Interrupt
Request address of serial port 1. The Optimal setting is
3F8/IRQ4. The Fail-Safe default setting is 3F8.
 Serial Port1 IRQ
This item specifies the IRQ used by the serial port 1.
 Serial Port2 Address
This item specifies the base I/O port address and Interrupt
Request address of serial port 2. The Optimal setting is
2F8/IRQ3. The Fail-Safe setting is 2F8.
 Serial Port2 IRQ
This item specifies the IRQ used by the serial port 2.
 Serial Port3 Address
This item specifies the base I/O port address and Interrupt
Request address of serial port 3.
 Serial Port3 IRQ
This item specifies the IRQ used by the serial port 3.
 Serial Port4 Address
This item specifies the base I/O port address and Interrupt
Request address of serial port 4.
 Serial Port4 IRQ
This item specifies the IRQ used by the serial port 4.