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By michaels
Is it reasonable to buy RFID USB reader if you want to interface the ID-12 RFID module to your PC? Or is it just easy to interface the ID-12 RFID module directly to your PC using the serial port?
By Duane Degn
Based on the comments on the ID-12 page, it looks like it works just fine with a serial connection to a PC.

There are lots of informative comments with at least one correction to the datasheet.