Hyperterminal is one good software to test but it is not a free source … I think it is better to use XCTU which is a free source and a flexible tool…
you just connect your RFID module and PC using RS-232 .( if your PC don’t hav a RS-232 use USB to RS-232 converter) .
now in XCTU select the COM port to which your reader is connected to your PC.
there are a set of standard BAUD RATES like 9600 in XCTU select one first and swipe the card.. if the number on card or a unique Hexadecimal code appears in Rx part of XCTU terminal bingo that is the baudrate of your RFID reader….
only thing left is just write a code for USART read and LCD write…
else continue the trial with other Baud_Rates… I think the Baud_rate would be 9600 as I saw many RFID readers having this baud rate