On 14 May 98 at 11:58, Scott Holthausen wrote:
> Hello TechNet,
> Can someone explain the difference between the RS-274-D and RS-274-X
> gerber formats?
RS-274-D is a "dumb" format with only coordinates and aperture
numbers assigned. The PWB designer has to supply a file or a sheet
of paper (which gets lost often....) with descriptions HOW the
aperture are.
RS-274-X "Extended Gerber" is a extension to this format which
*includes* all necessary definitions, additionally with more
possibilities with filled polygons etc. That means, it is more
complicated, and sometimes incompatibilities happen, caused by bad
implementations of the "official" syntax. But mostly, it works fine.
Here in Germany, it is not so much used to the designers and PWB
manufactures, but I for myself had nly the best experiences with it.
No wrong apertiure tables, better CAM import etc.
Some URLs which
give good explanations about the different Gerber styles.
http://www.artwork.com/gerber/appl2.htm "D-codes, Apertures and
Gerber Plot Files"- about RS-274-D-
http://www.artwork.com/gerber/274x/rs274x.htm
"What's all this about RS274X Anyway?"
RS274X - A Description of how the RS274X Extended Gerber Specification
Works....
- Introduction in RS274X -
http://www.gerbersystemscorp.com/11-Format/11-01-000.html
Gerber Systems Corporation Description of Gerber Format
- Description directly from the inventor -
The whole definition of extended Gerber can be downloaded as pdf-file
from
ftp://ftp.GerberSystemsCorp.com/pub/GSC/pdf/RS274XB.pdf
> As a secondary problem, I had a vendor ask me to send him a gerber
> file in RS-274-X format and when I looked at it with my gerber
> viewer, it looked different than the same file that was in RS-274-D
> format? Is this a problem with my design package (PADS PowerPCB) or
> my gerber viewer (Lavenir ViewMate)?
I remember that there was some times ago a thread about some bugs in
the RS-274-X postprocessor from PADS PowerPCB. I don't know
whether these bugs are fixed now. Perhaps you should search this
topic in the Technet- and DesignerCouncil archieves under
http://jefry.ipc.org/forum.htm or ask PADS.
Regards
Matthias Mansfeld
-----------------------------------------------
Matthias Mansfeld Elektronik
* Printed Circuit Board Design and Assembly
Am Langhoelzl 11, D-85540 Haar, GERMANY
P.O.B. 1143, D-85529 Haar, GERMANY
Phone: +49-89-4620 0937, Fax: +49-89-4620 0938
E-Mail: [log in to unmask]
Internet: http://home.t-online.de/home/matthias.mansfeld
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