vlan_alive(1)

NAME
     vlan_alive - determines the status of a VLAN transmitter

SYNOPSIS
     vlan_alive [-s serial_dev] [-q]

DESCRIPTION
     vlan_alive determines whether a VLAN transmitter is connected to the
     serial port specified by serial_dev. If serial_dev is not specified the
     defualt serial port, /dev/ttyd2 (port 2), is used.  If a VLAN transmitter
     is connected, it's network format (ie. NTSC or PAL) is determined. A
     message is printed on stderr indicating the status of the VLAN
     controller. In addition, the exit status code indicates the controller
     status.  If the -q option is specified, no message is printed and only
     the exit status is returned.

EXIT STATUS CODES
     The exit status codes are as follows:

     0    A VLAN transmitter is not connected to the specified serial port.

     1    An NTSC network format VLAN transmitter is connected to the
          specified serial port.

     2    An PAL network format VLAN transmitter is connected.

     3    A VLAN transmitter is connected to the specified serial port, but
          the network format is not recognized.

     9    Program execution error