RFID/NFC (13.56 MHz), is it possible to send raw bytes and receive response?
RFID protocols require either passive or active tags.  Depending on which you use, either the tag or reader regularly transmits pulses.  Check www.rfidreader.com for more info.  https://www.rfidjournal.com provides valuable resources as well.

Many companies invest heavily in developing RFID technology.  You would be well advised not to reinvent wheels without reeeeally deeeeeep pockets.