The standard Omnikey 5121 encoder uses PC/SC commands to encode and I have noted some resources below and attached the datasheet.
Link: http://search.msdn.microsoft.com/search/default.aspx?siteId=0&tab=0&query=scard
Link: http://msdn2.microsoft.com/en-us/library/ms953432.aspx
Please also have a look into the PC/SC standard.
Link: http://www.pcscworkgroup.com/
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