Impulse 3088 - Manual (Page 8)

Card Setup
Sealevel Systems DUOCOM: Page 5
Set the jumper to ‘S’ if you are using more than one DUOCOM: in a bus or you
wish to completely remove the pull-down resistor for hardware compatibility.
Setting the adapter in this configuration when it is not accompanied by a
pull-down resistor will prevent the ports from triggering an interrupt.
E3
N S R
1
2
Figure 5 - Header E3, Sharing IRQ’s with another adapter