Answer: Just received information from the developer. I have gone to planet website and followed the instructions provided but my software will not allow entries in the required fields they are grayed out is it because I am not using planet-cnc's board, I have used this method for years with Mach3 and would like to use it with the usb board and software. To setup homing for the Planet-CNC homing and limits, go to the Planet-CNC Machine setup page which explains the process step by step: Customer Response: How do I get homing on z to work with planet cnc software using build your own usb board. Alternatively, the end mill can be connected to the pin and the plate connected to GND as long as there becomes a complete circuit when the end mill touches the plate. You can use the autoset to setup that pin in Mach3 simply by touching the two together once connected to the pin and GND. Connect the plate (solder a wire to the plate) to one of the input pins. To home the z-axis using a plate: - Connect the end mill using a large clamping device like an alligator clip with a wire connected to GND.
