User`s manual

Chapter 2 Connecting Peripherals 25
The card mounting bracket holds the serial port connector for the one
port, and the parallel port and serial port adapter kit (supplied with the
card) holds the connector for the other port. This lets you connect and
disconnect cables after you install the card. The DB-9 connector on
the bottom of the bracket is the first RS-232 port, COM1. The DB-9
connector on the adapter kit is the second serial port, COM2.
Table 2-3: Serial port connections (COM1, COM2)
Connector Function
COM1 RS-232
COM2 RS-232/422/485
2.8.1 RS-232 connection (COM1-CN6)
Different devices implement the RS-232 standard in different ways. If
you are having problems with a serial device, be sure to check the pin
assignments for the connector.
2.8.2 RS-232/422/485 connection
(COM2-CN5: 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 PCN-6351/6351L board's ports:
Table 2-4: Serial port default settings
Port Address Interrupt Default
COM1 3F8, 3E8 IRQ4 3F8
COM2 2F8, 2E8 IRQ3 2F8