Impulse SIO4-104.485 (3543) - Manual (Page 5)

© Sealevel Systems, Inc. - 3 - SIO4-104.485 User Manual
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 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.