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ports(7)


NAME

  ports, port_names - Device (tty and lp) names for serial and parallel ports


SYNOPSIS

  Default Serial Ports:

  /dev/tty00

  /dev/tty01 (not present on a single-port system)

  Parallel Port:

  /dev/lp0


DESCRIPTION

  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:

  /dev/tty00
      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).

  /dev/tty01
      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 /dev/tty01).

  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.


SEE ALSO

  Commands: lprsetup(8)

  Devices: ace(7), modem(7)

  System Administration

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