HP Color LaserJet 5500 Technical Reference Manual page 251

Resource Saving
Printer Specific Job
Boundaries
Timeouts
protection, resolution, or printer language status. For
example, if the resolution is at 600 dpi and an application
sends the @PJL SET RESOLUTION = 600 command,
memory is not reconfigured.
None of the DeskJet 1200C or 1600C printer families
support resource saving.
Printers that support printer specific job boundaries:
HP DeskJet 1200C, 1200CM, 1600C, 1600CM
Unlike the LaserJet 4 family of printers, no implicit PJL
job boundaries are recognized. There are no additional
conditions which will cause the User Default Environment
values to be loaded into the PJL Current Environment, or
(subsequently) to be loaded into the Modified Print
Environment.
Printers that support printer timeouts:
HP DeskJet 1600C, 1600CM
These printers have a timeout capability which is used to
recover when jobs are interrupted by situations such as
host failures. The timeout duration varies depending on the
data received by the printer.
The TIMEOUT variable set using PJL establishes the I/O
timeout durations to wait before switching to another
pending I/O. If the printer has not received printable data,
it will wait for the TIMEOUT duration before closing the
current job and switching to another pending I/O. If the
printer has received printable data and is waiting for more
data, the printer uses an extended timeout duration, which
is equal to five minutes or ten times the TIMEOUT value,
whichever is greatest.
Feature Support A-39