Rose Electronics Porter - Manual (Page 22)

18 PORTER INSTALLATION AND OPERATIONS MANUAL
The manual mode can be used to exit the null destination state, but it cannot be used to
set the unit to the null destination state. You must use the (prefix + 9) command to do
this.
Manual mode may be entered if the front panel switches have been disabled (locked) by
the <prefix>Lx command or the configuration menu. Manual mode may be entered and
then exited without altering the unit’s operating mode and port connection if the advance
switch is not pressed by itself while manual mode is active