JMY6804 is a series of RFID read/write module. It has various functions and supports multi ISO/IEC standard of sans contact card. The RF protocole is complex, but the designer combined some frequent used command of RF card and then user could operate the cards with full function by sending simple command to the module.
L'impédance entre le module RF et l'antenne a été réglée par un analyseur d'impédance. And then the module has excellent performance and stability.