How do cups filters work

[Helge Blischke]

Anonymous wrote:
> 
> > raith at hlrs.de wrote:
> > >
> > > Can anybody give me a hint where I find documentation about
> > > how the filtering works in CUPS step by step.
> > >
> > > I defined a Nashuatec Postscript Printer (NRGD3545) using their PPD File in CUPS. On WINDOWS I use the driver they supply. If I send the printjob from WINDOWS I get the error message printed on the NRGD3545:
> > >
> > > ERROR: undefined
> > > OFFENDING COMMAND: @PJL
> > >
> > > STACK:
> > >
> > > I did the following testing:
> > >
> > > 1) Printed my documment to a file on Windows and used lpr to send this file to the the NRGD3545. Perfect printout!!
> > > 2) Stopped the NRGD3545 printer queue on the CUPS server and print the
> > > same document to the CUPS server. Compare the queue file and the    Windows local file. No difference!! Use lpr to send the CUPS queue file
> > > directly to the printer. Ups ERROR like obove. Use lpr -oraw instead.
> > > Perfect printout. From CUPS error-log I can see that pstops is used to
> > > print the file.
> > >
> > > the file in question looks like:
> > >
> > > %-12345X at PJL JOB
> > > @PJL ENTER LANGUAGE = POSTSCRIPT
> > > %!PS-Adobe-3.0
> > > %%Title: Microsoft Word - Dokument1
> > > %%Creator: PScript5.dll Version 5.2.2
> > > %%CreationDate: 4/12/2005 15:23:43
> > > %%BoundingBox: (atend)
> > > %%DocumentNeededResources: (atend)
> > > %%DocumentSuppliedResources: (atend)
> > > %%DocumentData: Clean7Bit
> > > %%TargetDevice: (NRG 3545/3518/3532 PS3) (3011.103) 2
> > > %%LanguageLevel: 3
> > > %%EndComments
> > >
> > > the first char is 0x1E = escape
> > >
> > > If I edit the queufile and delete the first two lines. Perfect
> > > printout.
> > >
> > > CUPS error-log says somewhere:
> > >
> > > [Job 11] Page = 595x842; 12,12 to 583,830
> > > D [12/Apr/2005:19:31:21 +0200] [Job 11] Skipping PJL header...
> > > D [12/Apr/2005:19:31:21 +0200] [Job 11] slowcollate=0, slowduplex=0, sloworder=0
> > > D [12/Apr/2005:19:31:21 +0200] [Job 11] 0 %%Title: Microsoft Word - Dokument1^M
> > >
> > > It seems that this is not done properly. The filter does not work
> > > how it is expected. As I do not know how these filters work or what
> > > else happens I am stuck here. I hope that more experienced users can
> > > help me or tell me where to find help.
> > >
> > > regards
> > >
> > > Dieter
> >
> > The escape character should be 0x1B .
> > Otherewise the PJL stuff won't be recognized.
> >
> > Helge
> >
> > --
> > Helge Blischke
> > Softwareentwicklung
> > SRZ Berlin | Firmengruppe besscom
> > http://www.srz.de
> 
> Sorry it is 0x1B

Post (an URL to) a sample file. Looking into it seems to be the only
means to 
trace the issue down.

Helge

-- 
Helge Blischke
Softwareentwicklung
SRZ Berlin | Firmengruppe besscom
http://www.srz.de