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Omega Engineering OMG-COMM8-A Page 6
Interrupt Mode Options
The OMG-COMM8-A will allow each port to have an independent
interrupt level or share an interrupt with another port on the adapter. The
OMG-COMM8-A will even share interrupts with a compatible port that is
located on another adapter. The OMG-COMM8-A can operate in three
interrupt modes. Header E9 determines the interrupt mode for Ports 1-4
and header E10 determines the interrupt mode for ports 5-8.
“N” indicates the (N)ormal, single interrupt per port mode. “S” Indicates
the (S)hared interrupt mode, which allows more than one port to access a
single IRQ. Any two or more ports can share a common IRQ by placing
the jumpers on the same IRQ setting, and setting the appropriate selections
at E5. Consult your particular software for IRQ selection. If no interrupt is
desired, remove the jumper. “M” indicates the inclusion of a 1K ohm pull-
down resistor required on one port when sharing interrupts.
Figure 4 - Header E9 and E10, Normal IRQ Mode
2
1
3
4
5
6
7
8
N S M N S M
E9
E10