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Hardware Installation 7

Interrupt Selection

You can configure an interrupt request line (IRQ) with the jumper

blocks JB1, JB2 and JB3 on the Xtreme/104 Opto adapter. Please

refer to Figures 1 and 2 for a description and location of the

jumper blocks JB1, JB2 and JB3.

You are able to configure the Xtreme/104 Opto adapter for four

ifferent IRQ modes. d

 Mode 1 (one IRQ):

1. First ensure there are no jumpers across positions E and D

on the JB3 jumper block.

2. All ports interrupting on one IRQ by setting jumpers on

the A or C rows and the middle rows of jumper blocks

JB1 or JB2.

 Mode 2 (two IRQs):

1. First jumper position D on the JB3 jumper block.

2. The odd ports (ports 1, 3) interrupt on one IRQ by setting

jumpers on the B or D rows and the middle rows of

jumper blocks JB1 or JB2.

3. The even ports (ports 2, 4) interrupt on one IRQ by

setting jumpers on the A or C rows and the middle rows

of jumper blocks JB1 or JB2.

 Mode 3 (two IRQs – Xtreme/104 Opto, 4 port model

only):

1. First jumper position E on the JB3 jumper block.

2. The first two ports (ports 1, 2) interrupt on one IRQ by

setting jumpers on the A or C rows and the middle rows

of jumper blocks JB1 and JB2.

3. The last two ports (ports 3, 4) interrupt on one IRQ by

setting jumpers on the B or D rows and the middle rows

of jumper blocks JB1 and JB2.

 Mode 4 (four IRQs – Xtreme/104 Opto, 4 port model

only):

1. First jumper positions D and E on the JB3 jumper block.

2. To set an IRQ for Port 1 install a jumper across a pair of

pins on A row and the middle row of IRQ block JB1.

3. To set an IRQ for Port 2 install a jumper across a pair of

pins on B row and the middle row of IRQ block JB1.

4. To set an IRQ for Port 3 install a jumper across a pair of

pins on C row and the middle row of IRQ block JB2.

5. To set an IRQ for Port 4 install a jumper across a pair of

pins on D row and the middle row of IRQ block JB2.

Xtreme/104 Opto User's Manual, ver. 0.03

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