Notice:
1)Only can choose 3 OR 4 signal group;
2)Pay attention to polarity when connecting hotbed and power supply.
Usage :
1. Plug a power supply ;
2. Connect to heated bed;
3. Connect digital control signal to GND,D8 of MKS MINI;
4. Connect to the heated bed signal on Ramps1.4 or MKS series controller boards.