Advantech PCM-3350 Series user manual Serial ports CN3 COM1 CN4 COM2/RS-232 CN18 COM2/RS-422/485

2.6Serial 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

COM1RS-232

COM2RS-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

Chapter 2 Installation 1 1