RF Ideas Inc RDR7081 ユーザーズマニュアル
pcProx
®
and AIR ID
®
Enroll Readers
Immediately following is the identification code. For a 26-
bit card this is 16 bits.
FACILITY CODE
The next bits are normally used as the facility code. For
a 26-bit card there are 8 bits.
PARITY BIT
The trailing 1-3 bits are usually a the parity bit(s).
The software does not perform any data validation
checking. This is due to the fact that the data must be
known before the read in order to verify its validity.
How to determine your format and masking
Rule1: 1st Convert to Binary
Rule 2: Card data format in binary is typically something
like:
parity + facility code + employee ID + parity
You may have 1-3 parity bits at either end. It looks like
you have 1 at the far end.
As an example let’s assume you have a card and expect
to receive the following number: 816159
If all bits are selected you find waving the card results in
the following number:
144238654
Using the Calculator supplied with Windows, select the
scientific mode and find the binary equivalents for each
of the above decimal numbers.
MSB LSB
1000100110001110100000111110 (144238654)
11000111010000011111 (816159)
Notice how deselecting the 1
bit card this is 16 bits.
FACILITY CODE
The next bits are normally used as the facility code. For
a 26-bit card there are 8 bits.
PARITY BIT
The trailing 1-3 bits are usually a the parity bit(s).
The software does not perform any data validation
checking. This is due to the fact that the data must be
known before the read in order to verify its validity.
How to determine your format and masking
Rule1: 1st Convert to Binary
Rule 2: Card data format in binary is typically something
like:
parity + facility code + employee ID + parity
You may have 1-3 parity bits at either end. It looks like
you have 1 at the far end.
As an example let’s assume you have a card and expect
to receive the following number: 816159
If all bits are selected you find waving the card results in
the following number:
144238654
Using the Calculator supplied with Windows, select the
scientific mode and find the binary equivalents for each
of the above decimal numbers.
MSB LSB
1000100110001110100000111110 (144238654)
11000111010000011111 (816159)
Notice how deselecting the 1
st
7 bits and the last parity
bit results in the same binary number! Select bits 2