Le 26/11/2014 21:54, Thiadmer Riemersma a écrit : > A question (because I am confused): are attributes not exclusive to X2? > > I understand the Gerber specification as: X1 = RS274X = Gerber without > attributes, and X2 = RS274X + attributes. > > Regards, Thiadmer Riemersma
Yes, X2 = RS274X + attributes The X2 format define some standard attributes: - File attributes. - Aperture attributes. (There are some other attributes in Gerber Drill Files) The most important attribute is the file attribute. There are 3 file attributes. The most important file attribute is "File Function" for instance, at the beginning of a Gerber image file of a 2 sided board, Pcbnew inserts the line: %TF.FileFunction,Copper,L2,Bot,Signal*% to identify the back side. The X1 (or RS274X format) does not have a file function attribute. However, in X1 files, Ucamco recommends a file function attribute using a compatible mode. The syntax is: G04 #@! TF.FileFunction,Copper,L2,Bot,Signal* which appears like a comment (G04) for X1 readers, and (for very recent X1 reader ) is a pseudo comment, in fact a file function attribute. "G04 #@! " starts a attribute in X1 mode. In X1 format, Pcbnew adds this pseudo comment, and Gerbview read and uses it. -- Jean-Pierre CHARRAS _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
