RFID Transponder transmission and reception working
From the NXP data sheet for the HTRC11001T they describe it as below:





The actual pin descriptions are:





Datasheet Source

You will need to read the data sheet to get a full understanding of the part. In summary the TX1 and TX2 pins are used to drive the coil to couple to the RFID device antenna when transmitting to the tag. The coil senses the magnetic field from the tag when the tag is transmitting and presents the detected signal to the RX pin.