FAQ

I have added a duplex option to my printer but even though my spool file attributes show that the job should be duplex, it prints in simplex. Why is that?

If you are certain that the printer has a duplexer installed, then the problem might be:

That the printer definition in PSS must reflect that the printer supports duplex:

Profile sample:

PRINTER PRTID=MYPRT,DUPLEX=YES,<other parameters>