for all our knowledge,

i would also like to know if the 12 digits i get from the usb reader, as sparkfun's video on their page...http://www.sparkfun.com/products/8419 is ASCII code.

It is needed first to understand what is this 12 digit number?

Thank you very much for your help. I need also to help you by understanding the basics. then might be easier for you to give me the right instructions.