QMS 860, Руководство пользователя, Страница: 347 / 398

End Job Mode on Your QMS 860 Printer
When sending print jobs through the serial and parallel protocols,
some applications and their printer drivers append an
end-of-document command (EOD) to each print job to ensure that
each file prints correctly. The reason for this is that some protocols
and print queuing systems send print jobs to the printer as one
continuous data stream (one print job immediately following
another).
But the problem with this system is that some applications are
limited by the printer language and are unable to produce an EOD
command. This becomes even more problematic when you are
printing to a QMS 860 Print System an emulation sensing processor
(ESP) where print jobs of any supported emulation can be
intermixed. ESP technology examines the first part of each print
job to determine its emulation. Once the emulation is identified, the
print job processes without further checking. This minimizes any
slowdown resulting from the sensing process. To help ESP
technology determine the proper emulation of successive print
jobs, the printer must be able to identify the end of job for each job.
Therefore, unless a wait timeout (the amount of time the printer is
waiting on data from the host) occurs and ends each print job, or
unless you add an EOD command between each file being printed
through these protocols, some print jobs may be interpreted by the
printer as one job and may “run” together. See chapter 4, the
“Administration/Communications Menu” section, for more
information on emulation timeout.
When printing multiple jobs with little or no time delay and with
no EOD command between each job, the serial and parallel
protocols may be unable to detect an end of job automatically. So
the End Job Mode feature on QMS Crown printers was designed
Appendix F
A d d i t i o n a l T e c h n i c a l I n f o r m a t i o n F - 1 9