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Configuring of the serial port should be done automatically,
both the serial driver software and by your application software. But
sometimes it isn't and you thus need to do it yourself. Or perhaps
you need to configure it in a special way, etc. This HOWTO only
covers configuration of the serial port itself and not the configuring
of any devices attached to the port (such as a modem).
The first part (locating the hardware or low-level configuring) is
assigning each port an IO address, IRQ, and name (such as ttyS2). This
IO-IRQ pair must be set in both the hardware and told to the serial
driver. We might just call this "io-irq" configuring for short. The
"setserial" program is sometimes used to tell the driver. PnP
methods, jumpers, etc, are used to set the IO and IRQ in the hardware.
Details will be supplied later. If you need to configure but don't
understand certain details it's easy to get into trouble. See
Locating the Serial Port: IO address IRQs
What is Setserial
The second part (high-level configuring) is assigning it a speed (such
as 115.2k bits/sec), selecting flow control, etc. This is often done
by communication programs such as PPP, minicom, or by getty (which you
may run on the port so that others may log into your computer).
However you will need to tell these programs what speed you want, etc.
by using a menu or a configuration file. This high-level configuring
may also be done manually with the stty program. stty is
also useful to view the current status if you're having problems. See
the section
Stty
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