PD20 Smart Pump Drive Series is a new generation of high-end intelligent integrated ultra-high protection water supply special products independently researched & developed by SAJ. The product body is dustproof and waterproof, and can be installed on various brands of pump motor terminal boxes, and can be accessed in various types of sensor signal. Featuring simple operation, good reliability, low noise and high performance, the system is equipped with dual independent RS485 interface, independent RTC, can achieve multi-pump control for both the main and auxiliary pumps; when the main machine controls the auxiliary machine through RS485, communication with other smart device or host computer can be achieved through another RS485.