The current capacity of the input sub-unit in input
sub-unit capacity units (PrtCapacityUnitTC). If this input
sub-unit can reliably sense this value, the value is
sensed by the printer and may not be changed by
management requests; otherwise, the value may
be written (by a Remote Contol Panel or a
Management Application). The value (-1) means other and
specifically indicates that the sub-unit places no
restrictions on this parameter. The value (-2) means unknown.
The value (-3) means that the printer knows that at least one
unit remains.
Additional information:
LaserJet 4500 can only detect empty/not empty in it's
trays. It returns -3 for not empty and 0 for empty.
If a tray is removed, a value of -2 (unknown) will
be returned. The tray 3 object does not exist when that option
is NOT installed.