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RS-274X (Extended Gerber)
RS-274X includes many high level commands and controls that let the creator of the Gerber data specify the PCB (photoplot) very precisely. The file contains all critical information.
RS274X is an extension to standard RS-274D (commonly known as Gerber) that includes:
The RS-274X specification was originally developed by Gerber Systems.
Determine if your Gerber files are in RS-274X format or RS-274D format.
Open a Gerber file with a text file editor like ( Notepad, Wordpad,... )
Example: %FSLAX24Y24*% this means : Format Statement Leading Zeros Suppression, Absolute Coordinates format=2.4.
The syntax is defined in the following image:
L = leading zeros omitted
A = absolute coordinate mode
Nn = sequence number, where n is number of digits ( rarely used)
Gn = preparatory function code ( rarely used)
Xa = format of input data ( 5.5 is max)
Yb = format of input data
Zb = format of input data ( Z is rarely, if ever seen)
Dn = draft code
Mn = misc code
Example of embedded aperture list:
The synax is:
AD - aperture description parameter
If you see the aperture macros present in your files then you definitely have files in RS-274X format.
A free Gerber & DPF viewer ( GC-Preview) can be downloaded from Graphicode. We have experience with this viewer, so we can help you if needed.
A complete description of the Extended Gerber format RS-274X can be found in the download section of the UCAMCO website : RS-274X Extended Gerber Format Specification