The duration in seconds after which the printer shall either:
(a) switch to another input subunit, if the value of
prtInputNextIndex is non-zero and prtGeneralAutoSwitch is on
or
(b) abort any job waiting for manually fed input, if the value
value of prtInputNextIndex is zero or prtGeneralAutoSwitch
is off or notPresent.
The event which causes the printer to enter the waiting state
is product specific.
A value of (-1) implies 'other' or 'infinite' which translates
to 'this input subunit doesn't support manual feed'.
A value of (-2) implies 'unknown'.