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...Axis cnc breakout board interface users manual this document describes the basic functionality and electrical specifications of stepperonline s st v functions features high performance cost effective maximum support stepper motor driver controllers compatible with mach linux emc etc parallel control software usb power supply peripherals powered phase are separated to protect computer security all signals opto isolated which can your input define limit emergence stop cutter alignment wide voltage range anti reverse function one relay output accessed by spindle or air pump water microstep drivers in market analog for inverter speed wiring diagram sales com www omc note seting below is common anode connection between stepping setting a first check install set correct not showing neither nor b unit select on menu config native units mm ports pins port setup selection outputs as per please turning direction relevant its method if right you adjust dir lowactive then click confirm button...