Card Setup
IRQ Selection
Headers E11 and E12 select the interrupt request for each serial port. If COM1: is
selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is selected, the corresponding jumper must be on IRQ3.
Note: Most communications software applications default COM3: to IRQ4 and COM4: to IRQ3. This requires the sharing of interrupts between COM1: and COM3:, and between COM2: and COM4:. While this is the default, it is not always the preferred setting. Check your software configuration instructions to determine the most appropriate IRQ selection.
15 14 | 12 11 10 | 7 6 5 | 4 3 | 2/9 |
Figure 2 - Header E11 and E12, IRQ Selection
Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting at header E11 and E12 and setting the appropriate selections at E5 and E6. Note that a polling type driver is needed to share interrupts in this fashion. Windows does not supply a polling type driver. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper.
Page 3 |
