but how about AA BB 06 00 00 00 01 01 03 03? this is hex command to control the RFID reader. i just want to get the basic idea how to enable & disable the RFID first. if i manage to enable & disable the reader, i can do lots more things with this reader. the reader that i buy is Mifare CR038. Here is the datasheet of the reader. with all, regards.