Require Arduino library for reading RFID of 856 Mhz.

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Shirin_P:
I am using a RS232 to TTL converter module.

Also does it require any special interfacing other than the RX-Tx of TTL going to Tx-Rx of Arduino Mega and the usual Vcc and GND??

The specs state that it already is TTL level.
If so, then you shouldn't need a converter.

With a Mega ofcourse NOT to the normal USB<>Serial TX/RX pins.
Use one of the three other hardware Serial ports, on pin 14-19.
Leo..