Omega Vehicle Security OMG-COMM2-EX - Manual (Page 8)

Card Setup
OMG-COMM2-EX Page 4
Interrupt Modes
Headers E9 and E10 select the interrupt modes for each port. Each port must be
set in the correct mode to insure proper installation. E10 sets Port 1 and E9 sets
Port 2
‘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 E1. 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.
E10
E9
N S M
N S M
Figure 4 - Headers E9 and E10, Normal IRQ Mode
Set the 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 IRQs possible. If you are using more than one
OMG-COMM2-EX or a compatible adapter in a bus you should only have one
port set to ‘M’. The following example shows both ports sharing a single IRQ.
E10
E9
N S M
N S M
Figure 5 - Headers E9 and E10, Shared IRQ Mode