The reader initializes the communication. The RF subject is activated, and several minimal amount commands are exchanged to detect a suitable card. 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://zanderzriar.wikiconversation.com/7042946/5_simple_statements_about_hydrabus_explained