Quote Originally Posted by john swift View Post

PS

a simple input tester I used to test a similar BOB without using a PC (or motion controller)

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I made Click image for larger version. 

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ID:	24654a pass-thru tester years ago when I was trying to work out what was happening with a printer/plotter I had. Exactly the same as that but with lower value resistors but each LED was powered by the printer or PC.