Omega Vehicle Security ISA RS-422 Manuel D’Utilisation
Card Setup
OMG-ULTRA-SIO
Page 3
IRQ Selection
Headers E11 and E12 select the interrupt request for each serial port. If COM1: is
selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is
selected, the corresponding jumper must be on IRQ3.
selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is
selected, the corresponding jumper must be on IRQ3.
Note: Most communications software applications default COM3: to IRQ4 and
COM4: to IRQ3. This requires the sharing of interrupts between COM1:
and COM3:, and between COM2: and COM4:. While this is the default, it
is not always the preferred setting. Check your software configuration
instructions to determine the most appropriate IRQ selection.
and COM3:, and between COM2: and COM4:. While this is the default, it
is not always the preferred setting. Check your software configuration
instructions to determine the most appropriate IRQ selection.
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Figure 2 - Header E11 and E12, IRQ Selection
Any two or more ports can share a common IRQ by placing the jumpers on the
same IRQ setting at header E11 and E12 and setting the appropriate selections at
E5 and E6. Note that a polling type driver is needed to share interrupts in this
fashion. Windows does not supply a polling type driver. Consult your particular
software for IRQ selection. If no interrupt is desired, remove the jumper.
same IRQ setting at header E11 and E12 and setting the appropriate selections at
E5 and E6. Note that a polling type driver is needed to share interrupts in this
fashion. Windows does not supply a polling type driver. Consult your particular
software for IRQ selection. If no interrupt is desired, remove the jumper.