If my understanding was right, after reading MFRC522 datasheet Rev.3.7 (26 March 2014)..
looks like that this RFID-RC522 can do Read and (maybe Write) using UART
(not only just SPI )..
as you can see :
PIN 24 = SDA, NSS, RX -> (NSS for SPI and RX for UART)
PIN 31 = D7, SCL, MISO, TX -> (MISO for SPI and TX for UART)
if that so, i think you can use this RFID at least for read the Tag with just connecting NSS and MISO (on RFID) direct to the PC using serial-to-USB cable (NSS to TX, MISO to RX) ..
no coding needed..
just open up Hyperterminal, and tap your tag to the reader, and the tag id must shown in hyperterminal
please... correct me if im wrong..