Card Type	Serial card
Chip Set	Unidentified
I/O Options	Serial port
Data Bus	8-bit ISA

CONNECTIONS
Function	Label
Serial port via DB-25 connector	P1

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Port mode select normal	E2	Pins 1 & 2 closed
	Port mode select shared	E2	Pins 2 & 3 closed
	Port mode select shared with pull down resistor	E2	Pins 3 & 4 closed
	100 ohm termination enabled	SW2/1	On
	100 ohm termination disabled	SW2/1	Off
	1K ohm pull up resistor enabled	SW2/2	On
	1K ohm pull up resistor disabled	SW2/2	Off
	1K ohm pull down resistor enabled	SW2/3	On
	1K ohm pull down resistor disabled	SW2/3	Off
	Connects TX+ to RX+ for RS-485 two wire operation	SW2/4	Unidentified
	Connects TX- to RX- for RS-485 two wire operation	SW2/5	Unidentified

ADDRESS SELECTION
Setting	SW1/1	SW1/2	SW1/3	SW1/4
Disabled	On	On	On	On
3F8	On	On	On	Off
2F8	On	On	Off	On
3E8	On	On	Off	Off
2E8	On	Off	On	On
3220	On	Off	On	Off
3228	On	Off	Off	On
4220	On	Off	Off	Off
4228	Off	On	On	On
238	Off	On	On	Off
300	Off	On	Off	On
308	Off	On	Off	Off
280	Off	Off	On	On
288	Off	Off	On	Off
290	Off	Off	Off	On
298	Off	Off	Off	Off

SERIAL PORT INTERRUPT SELECTION
IRQ		E1
	2	Pins 1 & 2 closed
	3	Pins 3 & 4 closed
»	4	Pins 5 & 6 closed
	5	Pins 7 & 8 closed
	7	Pins 9 & 10 closed
	10	Pins 11 & 12 closed
	11	Pins 13 & 14 closed
	12	Pins 15 & 16 closed
	15	Pins 17 & 18 closed

RS-485 DRIVER CIRCUIT SELECTION
Setting	E5
Driver enabled/disabled	Pins 1 & 2 closed
Driver enabled by UART RTS signal	Pins 3 & 4 closed
Driver always enabled	Pins 5 & 6 closed

RS-485 RECEIVER CIRCUIT SELECTION
Setting	E3
Receiver enabled/disabled	Pins 1 & 2 closed
Receiver enabled by UART RTS signal	Pins 3 & 4 closed
Receiver always enabled	Pins 5 & 6 closed

EIA-530/SIO-485 SELECTION
Setting	E4
EIA-530	Pins 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10 closed
SIO-485	Pins 11 & 12, 13 & 14, 15 & 16, 17 & 18, 19 & 20 closed