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Chapter 2 Installation 11
2.6 Serial ports
(CN3: COM1; CN4: COM2/RS-232;
CN18: COM2/RS-422/485)
The PCA-3350F offers two serial ports: COM1 in RS-232 and COM2
(CN4: RS-232, CN18:RS-422/485). Refer to CMOS "Integrated Peripher-
al" for RS-232, 422 or 485 settings. These ports let you connect to
serial devices (mouse, printers, etc.) or a communication network.
You can select the address for each port (for example, 3F8H [COM1],
2F8H [COM2]) or disable each port. Use the BIOS Advanced Setup
program, which is covered in Chapter 4.
The card mounting bracket holds the serial port connector for the one
port. 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 2-2: Serial port connections (COM1, COM2)
Connector Function
COM1 RS-232
COM2 RS-232/422/485
2.6.1 RS-232 connection (COM1: CN3)
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.
2.6.2 RS-232/422/485 connection
(COM2: CN4: RS-232; CN18: RS-422/485)
COM2 is an RS-232/422/485 serial port. You can select one of these
functions via BIOS, as detailed in Chapter 4.
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