The reader initializes the communication. The RF discipline is activated, and several other reduced stage commands are exchanged to detect a suitable card. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be employed to energy externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT in https://hydrabus75319.illawiki.com/1290681/top_hydrabus_secrets