Impulse SIO-104+2 (3502) User Manual download pdf (Page 5)

Card Setup

Sealevel Systems SIO-104+2 Page 3

Interrupt Modes

DIP-Switch positions ‘S’ and ‘M’ on switches SW1A and SW2A select the interrupt mode for each port. Each port

must be set in the correct mode to insure proper operation.

With the ‘S’ selected, the adapter is in a (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 E1and E2.

‘M’ indicates the inclusion of a 1K-ohm pull-down resistor required on one port when sharing interrupts.

Set the switch to ‘S’ for shared interrupt mode on all ports sharing an IRQ. On one of the ports 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 port set to ‘M’.

Headers E1 and E2 (IRQ Selection)

The SIO-104+2 has two interrupt selection jumpers, 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.

Figure 2 - Header E1 and E2, IRQ Selection (IRQ 3 shown selected)

Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting at header E1 and

E1 and setting the appropriate selections at SW1A and SW2A.

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Impulse SIO-104+2 (3502) User Manual Page 5