Convert Plt files to Pdf

It is probably a HP-GL/2 or HP RTL file, but it could also be PostScript, but that's a lot less likely. If you will open  one of the files in Notepad, we can probably identify what it is.  

If it starts with something like the line below, it's HP-GL/2 or HP RTL:

%0BBP1,"21x15.dgn",INPS8310,11177;RO90;SC;NP256;TR0;

If is it Postscript, it will hopefully be commented as Postscript near the top in Notepad.

If it is HPGL/2 or HPRTL there are two tools out there that might work for you. SPLOT (www.swplot.com/splot.htm) and ViewCompanion (www.softwarecompanions.com/viewcomp.html).

One of our guys in the office has used both of these and gave me the following info that hopefully will help you determine which is better for you. SPLOT is a lot better at simulating actual plotters, including whitespace and orientation. ViewCompanion is a much better viewer application, including saving to different formats, but doesn't handle whitespace as well. You can create a PDF from ViewCompanion, and it does have command line automation capabilities. Neither product was free, but they do offer a free trial period.

There may be other software out there that others have used and hopefully can comment on here.

Jo Terri

If they are post script  you can copy and rename the extensions via dos or bulk rename utilty  ( freeware) to .psc (or ps dont remember its over 6 years ago when I used to do just this task...)  and batch process the lot via full very acrobat  pdf writer  ....