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In SCO® UnixWare® there are four serial ports:
Each serial port must be configured correctly, connected to the device with which it is to communicate, and the driver must also be configured. The driver sends data to the serial port by writing a character at a time to the serial port's buffer. The port receives the character, converts it into a signal which can be passed along a serial cable, and sends it to the receiving device. See asyc(7) for information on the serial driver in UnixWare.
The ports (on most computers and terminals) have a DTE (Data Terminal Equipment) configuration. The serial ports on most modems are configured as DCE (Data Circuit-terminating Equipment). The COM1 and COM2 ports are DTE.
A serial board may contain several serial ports and may come with its own driver (an intelligent board). A board may either be plugged into an expansion slot on the motherboard of your computer, or built into the motherboard itself.
Serial boards are configured using the Device Configuration Utility. The IRQ and I/O address parameters can be configured. See ``UARTs'' for more information.
This topic provides a brief introduction to those aspects of serial communications which can be configured using the Serial Manager. It then shows you how to use the Serial Manager to configure serial ports.