The connection between J1-24(cable screen) and X25(5V ground) is not required. Gerry

Hi Angelo Printer cable has 25 pins. On the Stepcraft pins 18-24 are ground. Pin 25 is for the cable screen which appears not to be connected to g...

Hi Angelo Pinout as shown on your drawing is correct. Gerry

kpykcb I presume that you have set up the limits in software as described in post no. #1898 in this thread.. Gerry

Hi Have you checked that the limit switches are operating correctly.The X,Y & Z limit switches are wired in series and are normally closed. Whe...

Hi Jorg I have also connected grbl to my SC420. I would be very interested in a copy of your controller program and your grbl modifications, if you...