MS-422 IO card Settings and Configuration

Card Type	Multi I/O card
Chipset/Controller	UMC82450
I/O Options	Serial ports (2)
Maximum DRAM	N/A

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 1	CN1	Protective/ground connector	JP9
Serial port 2	CN2

SERIAL PORT CONFIGURATION
Port 1 (CN1)		Port 2 (CN2)	SW1/1	SW1/2
»	COM1	COM2	Off	Off
	COM1	Disabled	On	Off
	COM2	COM3	Off	On
	COM3	COM4	On	On

SERIAL PORT INTERRUPT SELECT
Port 1 (CN1)		Port 2 (CN2)	SW1/3	SW1/4	SW1/5	SW1/6
»	IRQ4	IRQ3	On	Off	Off	On
	IRQ3	IRQ4	Off	On	On	Off
	Disabled	Disabled	Off	Off	Off	Off

RS-422 DRIVER SELECT
Port 1 (CN1)	Port 2 (CN2)	JP1	JP2
Controlled by RTS	Controlled by RTS	Pins 1 & 2 closed	Pins 1 & 2 closed
Always on	Always on	Open	Open
Always Off	Always Off	Pins 2 & 3 closed	Pins 2 & 3 closed

RS-422/232 SELECT
Port 1 (CN1)	Port 2 (CN2)	JP4	JP3
RS-422	RS-422	Pins 1 & 2 closed	Pins 1 & 2 closed
RS-422	RS-232	Pins 1 & 2 closed	Pins 2 & 3 closed
RS-232	RS-422	Pins 2 & 3 closed	Pins 1 & 2 closed
RS-232	RS-232	Pins 2 & 3 closed	Pins 2 & 3 closed

PORT DIAGNOSTIC MODE
Port 1 (CN1)		Port 2 (CN2)	JP7	JP8
»	Normal operation	Normal operation	Pins 1 & 2 closed	Pins 1 & 2 closed
	IBM diagnostic test	IBM diagnostic test	Pins 2 & 3 closed	Pins 2 & 3 closed