Which function has PIN 3 on RA connector X1 of Main unit 2.4.1


 

Hi folks,

I have a question about the Main unit 2.4.1. I found in the schematics a connection from PIN 3 on RA connector X1 to Teensy Pin6 SUBD9 X1. Do I need this ? The RA stepper is only connected to Pins 1+2 and 4+5.

Regards

Jurgen