Meaning
Industrial file formats define the precise geometric shapes and layers required to manufacture a printed circuit board. Using gerber rs 274x allows a designer to embed aperture definitions directly within the file rather than supplying them in a separate text list. This self-contained structure eliminates the alignment errors that plagued older vector formats by combining coordinates and tool dimensions into a single stream of instructions.
Vector Command
The format relies on coordinate commands to move a virtual plotter across the board area. Flash and draw commands define whether a trace is being drawn or a pad is being placed. These commands use coordinate strings that must be parsed by the manufacturing software.
Aperture Definition
Embedded aperture tables define the shape and size of the drawing tools. This configuration includes declarations for circular pads, rectangular traces, and complex polygonal structures. By including these details in each file, the manufacturer can automate the conversion of the design into physical photoplots.
Multi-Layer Assembly
Each board layer requires a separate file to describe its copper, solder mask, or silkscreen pattern. These files are bundled into a single package for transfer to the board house. The manufacturer uses the files to generate the imaging files that expose the photoresist on the copper clad laminate.