Centroid Community CNC Support Forum

Ive got my scope hooked up to the 1st step pin of the db25 and acorn is configured from the wizard to use the db25 connector. Im feel like i am missing something as by default the pin is pulled high 5v and stepping pulls it to 0v. I would have thought it 0 and then pulled high. I've attached an image of the scope and as you an see there are some spikes in there which I was also surprised to see on my first bench tests?

Is ok am I missing something? Pulldown resistors?

any help appreciated

https://drive.google.com/file/d/1B8ZHea ... sp=sharing

The outputs can be inverted in the wizard if they are not what you need.
A spike or ringing is normal on any fast edge. This is more a function of what is connected ('scope lead. etc.) than the output driver. For most applications it can be considered a measurement artifact ("not real").

Yep ok tried the inversion again and looks good. For some reason when I tried before I didn't see a change..all good now