RS-274X Extended Gerber
The RS-274X Gerber format, also known as extended Gerber or X-Gerber, is a 2D bi-level vector image description format. It is a superset of RS-274-D standard Gerber, which is itself a subset of the EIA RS-274-D format for numerically controlled machines.
It is a human readable ASCII format. It consists of a sequence of commands and coordinates. Its imaging primitives are line draw, flash (display) predefined shapes at a given location and outline fill. Positive and negative graphics objects can be combined.
An example of a RS-274X file:
G04 Film Name: paste_top* G04 Origin Date: Thu Sep 20 15:54:22 2007* G04 Layer: PIN/PASTEMASK_TOP* %FSLAX55Y55*MOIN*% %IR0*IPPOS*OFA0.00000B0.00000*MIA0B0*SFA1.00000B1.00000*% %ADD28R,.11X.043*% %ADD39O,.07X.022*% ... %AMMACRO19* 21,1,.0512,.0512,0.0,0.0,45.*% %ADD19MACRO19*% %LPD*% G75* G54D10* X176250Y117500D03* Y130000D03* Y163750D03* ... G54D39* X496250Y142500D03* Y137500D03* Y132500D03* Y127500D03* M02*An RS-274X file contains the complete description of a PCB layer image without requiring any external files. It has all the imaging operators needed for a PCB image. Any aperture shape can be defined. Positive and negative objects can be combined. Planes can be specified without the need to "paint" or "vector-fill" as in RS-274-D.
RS-274X is a complete, powerful and unambiguous standard to describe a PCB layer. It can be input and processed fully automatically. This makes it well suited for fast and secure data transfer and for reliable and automated workflows.
The format specification is published. A tutorial is available.
Read more about this topic: Gerber Format
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