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Thanks. When I use the naming in the linked config instead of the naming from docu it works!
I can see dir and step signals now on the correct pins.
One last problem before I can test with the machine. I use an enable signal for the stepper driver. I see it on the pin, but inverted. Is there a possibility to invert output pins at raspberry pi 5 or should I better do it in hardware?

It is a RPI. 
When I run the yzEllipse75.ngc, the machine encounters an error related to IMG_6867.JPG, IMG_6868.JPG, and IMG_6869.JPG.