The reader initializes the conversation. The RF subject is activated, and several very low level commands are exchanged to detect a appropriate card. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be utilized to electric power externally the WCH CH569 MCU (it is recommended to eliminate the P4/SHUNT https://mariocumdt.wikinarration.com/6630323/indicators_on_hydrabus_you_should_know