An USB isolator allows eradicate floor loops and decreases electromagnetic interference (EMI) involving the computer along with the related unit. 1x GND 3V3 (P2 with two pins 2.54mm) connector can be utilized to electric power externally the WCH CH569 MCU (it is recommended to get rid of the P4/SHUNT in https://hydrabus73966.digitollblog.com/32974177/the-ultimate-guide-to-hydrabus