Schlage PIB300 User Manual page 301

HandPunch 3000/4000 Manual
™
Wiegand Reader – The term "Wiegand Reader" has two meanings depending upon
its application. A true Wiegand reader reads a specially constructed card made
up of small pieces of magnetic wire. As the card is swiped through the reader, the
individual bits of wire generate a unique data signal. This data signal is made up
of a Facility Code field (typically 8 bits), an ID number field (typically 16 bits), and
parity bits (typically 2 bits) for a total of 26 bits of data. Now this 26-bit Wiegand
data format has been adopted by a variety of card reader devices for entering user
ID data. Other Wiegand formats (for example, 37-bit) are used as well.
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