The third, and more difficult of the three methods is to use a USB to Serial adapter (USB to USART or RS-485). The controller will also have an output that outputs a high or low and that can control the on/off on the VFD. There is a termial on the VFD to receive this signal line. The second is to have a controller output a DAC voltage between 0-10 volts to control speed on the VFD/Spindle. This will allow your spindle to have on/off control through Mach4 with an output pin. The first and easiest is to have your VFD's power controlled by a relay. The best way to determine how to control your VFD using Mach4 is to read the MAch4 manual found here: You will find that there a a few ways to control the spindle/VFD on your CNC machine or CNC Router.
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