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2.15.2 RS-232/422/485 connection
(COM2: CN15: RS-232; CN14: RS-422/485)
COM2 is an RS-232/422/485 serial port. The specific port type is
determined by jumper settings (JP1), as detailed in Chapter 1.
The IRQ and address range for both ports are fixed. However, if you
wish to disable the port or change these parameters later, you can do
this in the system BIOS setup. The table below shows the settings for
the PCA-6751 Series' board's ports:
Table 2-3: Serial port default settings
Port
COM1
COM2
2.16 External keyboard connector (CN17)
In addition to the PS/2 mouse/keyboard connector, an additional
external keyboard connector is provided.
For external keyboard pin assignments, see Appendix D.
2.17 ATX power connector (CN18)
If the PCA-6751 Series is used as a standalone card, both the 4-pin
main power connector (CN20) and the ATX power connector (CN18)
must be connected to the power supply. If the PCA-6751 Series is
used with a passive backplane, the main power connector (CN20)
should not be connected as the card will be powered from the back-
plane.
Use the ATX adapter cable (provided) to connect the PCA-6751
Series with the ATX power supply. The ATX adapter cable has two
different connectors at either end. The ATX 20-pin (female type)
connects to the power supply, while the 3-pin (female type) connects
to the ATX power connector (CN18) on the board itself.
24
PCA-6751 Series User's Manual
Address
3F8, 3E8
2F8, 2E8
Interrupt
IRQ4
IRQ3
Default
3F8
2F8
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