Advantech DVMB-554E - Manual (Page 31)

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such as a mouse or printer, or to a communications network.
The IRQ and address ranges for both ports are fixed. However, if you
want to disable the port or change these parameters later, you can do this
in the system BIOS setup.
Different devices implement the RS-232/422/485 standards in different
ways. If you are having problems with a serial device, be sure to check
the pin assignments for the connector.
2.6 External PS/2 and Composite TV-Out (CN2)
The DVMB-554E provides a PS/2 keyboard/mouse connector. A 6-pin
mini-DIN connector is located on the rear face plate. It comes with an
external Y cable to convert from the 6-pin mini-DIN connector to PS/2
keyboard and PS/2 mouse connection.
2.7 Fan Connector (FN1/FN2/FN3)