The MKS DLC V2.1 SCH provides the full circuit layout.
: A visual pinout guide for stepper motors (X, Y1, Y2, Z) and auxiliary ports is available on Are you setting this up for a laser engraver CNC router , and do you need help with the specific GRBL configuration MKS DLC32 V2 Wiring Manual - Solo Motor Controllers makerbase mks dlc v21 manual link