Require Arduino library for reading RFID of 856 Mhz.

But the wire given as output has only the DB9 female port. Thus I thought I need the converter.

What am I getting wrong?
and also do you think I can use the RFID libraries available for other RFID readers such as those used for 125KHz or 13.56Mhz for the 856 Mhz too?

and yes I meant the Hardware Serial ports.