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© Sealevel Systems, Inc. 3543 Manual | SL9119 9/2022
Card Setup
Address Selection
The
SIO4-104.485
occupies 16 consecutive I/O locations. The DIP-switch (SW1) is used to set the base
address for these locations and the IRQ mode options. Be careful when selecting the base address as some
selections conflict with existing PC ports. The following table shows the addressing options available. If
different address options are required, please contact Sealevel Systems Technical Support about a custom
PAL option.
SW1-1
SW1-2
SW1-3
Port 1
Port 2
Port 3
Port 4
Off
Off
On
300
310
320
330
Off
On
Off
400
410
420
430
Off
On
On
500
510
520
530
On
Off
Off
600
610
620
630
On
Off
On
1500
1510
1520
1530
On
On
Off
3220
3230
3240
3250
On
On
On
4220
4230
4240
4250
Interrupt Modes
DIP-Switch positions ‘S’ and ‘M’ on switch SW1 selects the interrupt mode for each adapter.
With the ‘
S
’ selected, the adapter is in a (
S
)hared interrupt mode, which allows more than one adapter to
access a single IRQ.
‘
M
’ indicates the inclusion of a 1K-ohm pull-down resistor required on one adapter when sharing interrupts.
Set the switch to ‘
S
’ for shared interrupt mode on all adapters sharing an IRQ. On one of the adapters sharing
an interrupt set the switches for both ‘
S
’ and for ‘
M
’. This provides the pull-down resistor circuit that makes
sharing IRQs possible. If you are using more than one compatible adapter in a bus, you should only have
one adapter set to ‘
M
’.
IRQ Selection
The
SIO4-104.485
has an interrupt selection jumper, which should be set prior to use, if an interrupt is
required by your application software. Consult the user manual for the application software being used to
determine the proper setting.
