Hello, On my previous CNC machine I used arduino with Synthetos gShield V5. It was possible to adjust the position of the spindle manually by means of rotation appropriate axis manually, using rotary knobs. It was very useful, especially when adjusting Zero of Z axis using sheet of paper. Now I switch to cnc controller and real drivers like DM542 and CNC controller (GRBL). When I make connection all motors gets locked and it is impossible to rotate axis by hand. Only by software . Is it possible to unlock the motors ( without switching off the connection) to move them manually by hand? And why it was possible using gShield and arduino and is not possible using DM542 drivers and cnc controller (GRBL)?