An USB isolator will help eliminate ground loops and cuts down electromagnetic interference (EMI) in between the pc and the linked machine. 1x GND 3V3 (P2 with two pins 2.54mm) connector can be utilized to ability externally the WCH CH569 MCU (it is recommended to get rid of the P4/SHUNT https://remingtonrjbtk.wikiconverse.com/5334514/the_hydrabus_diaries