Adding serial terminals

Setting up serial consoles

You can configure a serial device, rather than a display adapter, as your system console. The boot(HW) program sets the default console at boot time according to this procedure:

  1. The boot program looks for the entry SYSTTY=x (where x is a number that specifies the system console device) in the /stand/etc/default/boot file.

  2. If the SYSTTY entry is not found or the /stand/etc/default/boot file is not readable, boot checks your system for a display adapter and designates it as your system console.

  3. If no display adapter is found, boot looks for tty1a, sets the serial port to 9600bps, 8 data bits, 1 stop bit, and no parity, and uses it as the system console.

To change the console device to a serial terminal:

  1. Enter system maintenance mode.

  2. Enter the following commands (all 12 tty devices need to be specified on the second line):

    enable tty1a
    disable tty01 tty02 tty03 tty04 ... tty10 tty11 tty12

    This enables the serial device and disables the console multiscreen devices associated with a display adapter.

  3. Edit the /etc/default/login file to change the value of the parameter OVERRIDE from ``tty01'' to the tty line of the serial console (normally its value is ``tty1a''). After editing, the line in /etc/default/login (if the tty line is tty1a), should read:

  4. Edit the file /etc/default/boot (not /stand/etc/default/boot) and add the following line to the end of the file:

  5. Reboot.
To temporarily change the system console device from the command line, enter systty=x at the boot prompt (where x is ``cn'' for a display adapter or ``sio'' for a COM1 serial port). This does not create or change a SYSTTY entry in the /etc/default/boot file.
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© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003