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Card Setup
Omega Engineering OMG-COMM8-A Page 7
Set jumpers to “S” for shared interrupt mode on all blocks sharing an IRQ
except one. Set that port block for “M”. This provides the pull-down
resistor circuit that makes sharing of IRQ possible. If you are using more
than one OMG-COMM8-A or a compatible adapter in a bus you should
only have one port set to “M”. The following example shows all four ports
sharing a single IRQ.
Figure 5 - Header E9 and E10, Shared IRQ Mode
Set jumper to “S” if you are using more than one OMG-COMM8-A in a
bus or you wish to completely remove the pull-down resistor for hardware
compatibility. Setting the OMG-COMM8-A in this configuration when
it is not accompanied by a pull-down resistor will prevent the ports
from triggering an interrupt.
Figure 6 - Header E9 and E10, Sharing IRQ’s with another adapter
2
1
3
4
5
6
7
8
N S M N S M
E9
E10
2
1
3
4
5
6
7
8
N S M N S M
E9
E10