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COM1 and COM2 are one set. You can exchange the address range and
interrupt IRQ of COM1 for the address range and interrupt IRQ of COM2.
After exchanging, COM1's address range is 2F8 ~ 2FF and its request IRQ
is IRQ3: and COM2's address range is 3F8 ~ 3FF and its interrupt IRQ is
IRQ4.
COM3 and COM4 are another set. Their selectable function is the same as
the COM1/COM2 set.
Port
Address Range
COM1
3F8 ~ 3FF
COM2
2F8 ~ 2FF
COM3
3E8 ~ 3EF
COM4
2E8 ~ 2EF
5.3.2 COM3/COM4/RI pin setting (JP2, JP1) (Reserved)
+5 V output
6
5
4
3
2
1
* default setting
+5 V output
6
5
4
3
2
1
* default setting
Interrupt
IRQ4
IRQ3
IRQ10
IRQ5
+12 V output
6
5
4
3
2
1
+12 V output
6
5
4
3
2
1
Chapter 5
Jumper Settings and Connectors
* RI output
6
5
4
3
2
1
* RI output
6
5
4
3
2
1
59
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