An USB isolator assists eliminate ground loops and cuts down electromagnetic interference (EMI) among the computer and also the linked machine. 1x GND 3V3 (P2 with two pins two.54mm) connector can be utilized to energy externally the WCH CH569 MCU (it is recommended to eliminate the P4/SHUNT in that scenario https://sethfxpgx.wonderkingwiki.com/1261266/5_essential_elements_for_hydrabus