. The Gerber Format Specification A format developed by Ucamco Revision 2020.09 Contents Contents ........................................................................................................................ 2 Preface ........................................................................................................................... 8 1 Introduction .............................................................................................................. 9 1.1 Scope and Target Audience ............................................................................... 9 1.2 Further Resources .............................................................................................. 9 1.3 Reference Gerber Viewer ................................................................................... 9 1.4 Questions ............................................................................................................ 9 1.5 Copyright and Intellectual Property ................................................................... 10 1.6 About Ucamco .................................................................................................. 10 2 Overview ................................................................................................................. 11 2.1 File Structure ..................................................................................................... 11 2.2 Apertures .......................................................................................................... 11 2.3 Graphics Objects .............................................................................................. 12 2.4 Draws and Arcs ................................................................................................. 13 2.5 Operations (D01, D02, D03) ............................................................................. 14 2.6 Graphics State .................................................................................................. 15 2.7 Polarity .............................................................................................................. 17 2.8 Blocks ............................................................................................................... 18 2.9 Attributes ........................................................................................................... 18 2.10 Commands Overview ..................................................................................... 19 2.11 Processing a Gerber File ................................................................................ 21 2.12 Glossary .......................................................................................................... 23 2.13 Annotated Example Files ................................................................................ 26 Example: Two Square Boxes ................................................................... 26 Example: Polarities and Apertures ........................................................... 27 2.14 Conformance .................................................................................................. 31 3 Syntax ..................................................................................................................... 32 3.1 Conventions for Syntax Rules ........................................................................... 32 3.2 File Extension, MIME Type and UTI ................................................................. 32 3.3 Character Set .................................................................................................... 33 3.4 Data Blocks ....................................................................................................... 33 3.5 Commands ........................................................................................................ 33 Command Syntax Overview ....................................................................... 33 Block commands ........................................................................................ 34 Extended Commands ................................................................................. 35 Copyright Ucamco NV 2 Having a question or remark about the spec? Please contact us at [email protected] 3.6 Data Types ........................................................................................................ 35 Integers ...................................................................................................... 35 Decimals ..................................................................................................... 35 Hexadecimal ............................................................................................... 36 Coordinate Data ......................................................................................... 36 Strings ........................................................................................................ 36 Fields .......................................................................................................... 37 Names ........................................................................................................ 37 4 Graphics ................................................................................................................. 38 4.1 Coordinate Commands ..................................................................................... 38 Format Specification (FS) ........................................................................... 38 Unit (MO) .................................................................................................... 39 4.2 Aperture Definition (AD) .................................................................................... 40 AD Command ............................................................................................. 40 Zero-size Apertures .................................................................................... 40 Examples .................................................................................................... 41 4.3 Standard Aperture Templates ........................................................................... 42 Overview .................................................................................................... 42 Circle .......................................................................................................... 42 Rectangle ................................................................................................... 44 Obround ..................................................................................................... 45 Polygon ...................................................................................................... 46 Transparency of Holes ............................................................................... 47 4.4 Aperture Macro (AM) ........................................................................................ 48 AM Command ............................................................................................ 48 Primitives .................................................................................................... 50 Exposure Parameter .................................................................................. 61 Rotation Parameter .................................................................................... 62 Macro Variables and Expressions .............................................................. 63 Examples .................................................................................................... 66 4.5 Block Aperture (AB) .......................................................................................... 70 Overview of block apertures ....................................................................... 70 AB Statement Syntax ................................................................................. 70 Usage of Block Apertures ........................................................................... 71 Example ..................................................................................................... 72 4.6 Set Current Aperture (Dnn) ............................................................................... 74 4.7 Operations (D01/D02/D03) ............................................................................... 75 Overview .................................................................................................... 75 Coordinates ................................................................................................ 76 Interpolate (D01) ........................................................................................ 77 Move (D02) ................................................................................................. 77 Flash (D03) ................................................................................................. 78 Example ..................................................................................................... 78 Copyright Ucamco NV 3 Having a question or remark about the spec? Please contact us at [email protected] 4.8 Interpolation State Commands (G01,G02,G03,G74,G75) ................................ 80 Linear Interpolation (G01) .......................................................................... 80 Circular Interpolation (G02, G03, G75, G76) .............................................. 81 Example: Single Quadrant Mode ..............................................................