PPS Protocol is a dedicate protocol for power sources, it can be used to adjust output voltage or current of power supplies according to system commands or system requests. In other words, it makes a power source more intelligent and the system can control the power source freely, such as output current, output voltage, total output capability , and so forth. All control of information can be added into PPS protocol. Any devices that comply with PPS protocol can decode it and communicate each other smoothly to attain the expected voltage or current.