Sorry if I replied late. In our project design. I need a simple on and off program for my APC UPS using its serial port. I have a GUI that has a button for the UPS to be turned ON and OFF if i click it’s icon. To make it short and simple. I want to learn how to switch on and off my UPS automatically without touching the UPS directly and without using powerchute. Thanks guys! I really appreciate your help. May God bless you and your family.