For convenience, all the important downloads in a list:
CNC plotter script
http://www.larsby.com/johan/?p=761
Adobe Illustrator script
http://www.ricardmarxer.com/geomerative/
Edwin Jakobs plotter lib:
http://www.contrechoc.com/blogPics/plotter/HPGL-0.1.0.zip
5x7 font sketching:
basicDrawing_Plotter_5x7.pde
basic drawing for a plotter script:
basicDrawing_Plotter.pde
loading letter files for drawing "mama" (for instance)
plottingletters_loadFile.pde
Bezier plotting, single curve:
bezier curve,
You can download a sketch with the plotterlib of "BEAM" here: (also included in other examples)
plotterLibExample.pde
The schema for the connections:
and we need a driver:
http://sourceforge.net/projects/osx-pl2303/