Anyway, I reverse engineered it and here's the schematic. There's one serious issue with it and that's the pull up resistor pack on the extra 4 outputs. That results in the relay being energized when nothing is connected to the parallel port or if the application isn't running. If I got the parts and traces right the PWM output is also fully on at 10V with nothing connected. John Dammeyer "ELS! Nothing else works as well for your Lathe" Automation Artisans Inc. www dot autoartisans dot com
MACH3InterfaceBoB.pdf
Description: Adobe PDF document
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