© 1998-2006 RF IDeas, Inc.
There are several bits constructed together which make
up the data sent from the proximity token to the reader.
The reader reads all bits for any format card produced.
The proximity token has several bits, and these will vary
from customer to customer. There are literally hundreds
of bit formats and lengths for proximity cards! The most
popular is the 26-bit format card. There are actually 24
bits of usable information as the first and last bits are
really parity bits to ensure data integrity.
This is typical layout for a 26-bit card.
PARITY BIT
The leading and trailing 1-3 bits are usually the parity bits.
For a 26-bit card, only 1 leading and 1 trailing parity bit is
used.
IDENTIFICATION CODE
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