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© Sealevel Systems, Inc. 3420 Manual | SL9145 9/2022
1
2
3
4
5
6
7
8
N S M N S M
E9
E10
Figure 4 - Header E9 and E10, Normal IRQ Mode
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 IRQ sharing possible. If you are using more
than one
COMM+8
or a compatible adapter in a bus, you should only have one port set to “
M
”. The following
example shows all eight ports sharing a single IRQ.
1
2
3
4
5
6
7
8
N S M N S M
E9
E10
Figure 5 - Header E9 and E10, Shared IRQ Mode
Set all jumpers to “
S
” if you are using more than one
COMM+8
in a bus or you wish to completely remove
the pull-down resistor for hardware compatibility.
Setting the COMM+8
in this configuration when it is not
accompanied by a pull-down resistor will prevent the ports from triggering an interrupt
.
1
2
3
4
5
6
7
8
N S M N S M
E9
E10
Figure 6 - Header E9 and E10, Sharing IRQs with another adapter
