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I like this hack, mostly because the builder took a very pragmatic approach to achieving his goal.  The RFID (Radio Frequency ID) reader used s designed to work on a serial port. 

Rather than build a circuit from the ground up to get this working on a USB port, a USB to serial adaptor was used instead. 

The end result is rough and ready, but think how much work and money was saved by using a cheap adaptor. 

Not only that but an un-needed MAX 213 was salvaged for the parts bin.  OK these can be ordered on Maxims sample program, but parts bins always need that extra piece.

Read more at….Elektronika.ba - Lazy man's USB RFID reader