RF Ideas Inc RDR8XX8U Manual De Usuario
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Appendix
Standard 26 Bit Format Structure
There are several bits constructed together that comprise data sent from the proximity card to the
device. There are numerous bit formats and lengths for proximity cards. The most popular is a 26 bit
card format. The typical layout for this format is 24 bits of usable information as the first and last are
parity bits to ensure data integrity.
device. There are numerous bit formats and lengths for proximity cards. The most popular is a 26 bit
card format. The typical layout for this format is 24 bits of usable information as the first and last are
parity bits to ensure data integrity.
The 26 bit format consists of 255 possible facility codes. Within each facility code there is a total of
65,535 unique card numbers.
65,535 unique card numbers.
The standard 26 bit Wiegand format is H10301. It is binary encoded data. The format consists of 2
parity bits, 8 bit facility code (F) and 16 bit card number fields (B). This format displays below.
parity bits, 8 bit facility code (F) and 16 bit card number fields (B). This format displays below.
PFFFFFFFFBBBBBBBBBBBBBBBBP
EXXXXXXXXXXXX.............
.............XXXXXXXXXXXXO
EXXXXXXXXXXXX.............
.............XXXXXXXXXXXXO
Bit Coding
P = Parity
O = Odd Parity
E = Even Parity
X = Parity mask
F = Facility code, range = 0 to 255
B = Card Number, range = 0 to 65,535
P = Parity
O = Odd Parity
E = Even Parity
X = Parity mask
F = Facility code, range = 0 to 255
B = Card Number, range = 0 to 65,535
In general, the 26 bit format is the industry standard format. Primary benefits of this include:
• Open format
• Convenient to order
• Universal access control panel acceptance
• Convenient to order
• Universal access control panel acceptance
The sale of this format is not limited to any one company yet the range of card numbers available in
this format is limited. There is a potential for card numbers to be duplicated.
this format is limited. There is a potential for card numbers to be duplicated.
Please go to
www.RFIDeas.com
and follow the Support
a
Learning Center
a
Proximity Card
Formats link for more details. The card manufacturer may also have additional details about the card
format.
format.
Chapter 5
Tips and Troubleshooting