Impulse 3087 Manuel d'utilisateur télécharger pdf (Page 7)

Card Setup

Sealevel Systems COMM+2/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.

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

COMM+2/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.

N S M

Figure 5 - Headers E9 and E10, Shared IRQ Mode

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Impulse 3087 Manuel d'utilisateur Page 7