In the Passive RFID system, the reader sends signal to the tag using an antenna. The tag receives this information and re-sends this information along with the information in its memory. The reader receives this signal and transmits to the processor for further processing.
Rfid tag reader for NXT and EV3 and tags.
MFRC522 chip based reader.
Operating frequency: 13.56MHz.
Supply Voltage: 5V.
Current: 13-26mA.
Read Range: Approx 3cm with supplied card and fob.