Black Box RS-232, IC181C manual Option Selection, 1. IRQ Selection

CHAPTER 4: Option Selection

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.

NOTE

IRQ 2 on AT class machines is not available. IRQ 9 is substituted in place of IRQ 2. To select IRQ 9, place jumper in the IRQ 2 position.

1 2

M

S

N

M

S

N

3 4

E5

PORT 1 (COM1)										E4
2	3	4	5	6	7	10	11	12	15
PORT 2 (COM2)										E3
2	3	4	5	6	7	10	11	12	15
PORT 3 (COM3)										E2
2	3	4	5	6	7	10	11	12	15
										E1
PORT 4 (COM4)
2	3	4	5	6	7	10	11	12	15

Figure 4-1. IRQ Selection.

Figure 4-1 shows the correlation between jumper block E5 and the interrupt jumpers (E1–E4). This example shows the Four Port RS-232 Serial Interface shipping configuration with COM1: and COM3: sharing interrupt 4 and COM2: and COM4: sharing interrupt 3. See Section 4.2 for more information on the different configuration options available with Jumper E5.

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