HP PCL/PJL reference - Printer Job Language Technical Reference Manual

A-48 Product-Specific Feature Support EN
Using the control panel to perform a self test, or to print a
typeface list or demo page.
A job boundary indicated by the I/O card, such as the
AppleTalk end-of-file.
Timeouts
These printers have a timeout capability which is used to recover
when jobs are interrupted by situations such as power failures. The
timeout duration varies depending on the data received by the printer.
The TIMEOUT variable set using PJL or the control panel establishes
the job timeout duration for those jobs that do not contain JOB or
ENTER commands. For jobs that do contain the JOB or ENTER
commands, the printer uses an extended timeout duration, which is
equal to five minutes or ten times the TIMEOUT value, whichever is
greatest.
Printers that support the TIMEOUT variable:
HP LaserJet 4, 4M, 4 Plus, 4M Plus, 4V, 4MV, 4Si, 4SiMx,
4ML, 4P, 4MP, 4PJ, 4LJ Pro, 4LC, 4000 series, 5, 5M, 5P, 5MP,
6P, 6MP, 5Si, 5SiMx, 5Si Mopier, 2100 series, 4500 series,
5000 series, 8000 series, 8100 series, 8500 series