ports, port_names - Device (tty and lp) names for serial
and parallel ports
Default Serial Ports: /dev/tty00
/dev/tty01 (not present on a single-port system)
Parallel Port: /dev/lp0
AlphaStation and AlphaServer systems provide one or two
9-pin serial communication ports. These ports are usually
labelled 1 (COMM1) and 2 (COMM2), but they may be identified
by different icons. Using the appropriate serial
cable and terminator, you can connect a serial printer,
external modem, or character-cell terminal to a serial
port. Most AlphaStation and AlphaServer systems also provide
one parallel port, for use with a parallel printer.
When you add a device to your system, the installation
documentation may instruct you to map the device pathname
to the port. These devices are located in the /dev directory.
For serial-line ports, the two default device pathnames
are: This pathname always maps to 1, COMM1, the lowest
port number, an icon for a terminal console, or the only
serial port (on a single-port system). This pathname
always maps to 2, COMM2, the next numbered port, or (if
one serial port is labeled with an icon for a terminal
console) the remaining serial port.
If your system hardware has been extended to include additional
serial ports, the pathnames /dev/tty02, /dev/tty03,
and so forth, may also be available to you. However, most
systems have only /dev/tty00 and /dev/tty01 as the device
pathnames for serial ports.
The one parallel port on an AlphaStation or AlphaServer
may be labeled with the word printer or a printer icon. On
some systems, the parallel port may not be labeled. The
device pathname for the parallel port is /dev/lp0. Currently,
Tru64 UNIX does not fully support parallel printers,
so fewer devices are connected to this port as compared
to serial ports.
If you are connecting a terminal console to your system,
it must be connected to the serial port mapped to
/dev/tty00. For other serial devices, it does not matter
which of the serial ports you choose for the connection.
For example, suppose you are setting up a system that has
two serial ports, labeled 1 and 2. You intend to use a
serial-line terminal rather than a workstation monitor as
the system console and also want to connect a serial-line
printer to the system. In this case, you must connect the
terminal to the port labeled 1 (with the device pathname
/dev/tty00). Therefore, you must connect the printer to
the remaining port labeled 2 (with the device pathname
If, for the same type of system, you intend to use a workstation
monitor as the system console, it does not matter
which serial port you use for a serial-line printer or
modem. In other words, you can connect the printer to
either port 1 (with pathname /dev/tty00) or port 2 (with
pathname /dev/tty01). When prompted to enter a /dev/tty**
pathname by the lprsetup script or the Print configuration
tool in the CDE Application Manager, you would specify
/dev/tty00 if you connected the printer to port 1 or
/dev/tty01 if you connected the printer to port 2.
See the System Administration manual for more information
on setting up consoles (including remote consoles) and
printers. See the modem(7) reference page for more information
on setting up modems.
Devices: ace(7), modem(7)
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