MDR300-0-0-AC-02
September 2010
Page 10
Wiegand 26-bit Protocol
Key Codes are reported as a 24-bit code consisting of an 8-bit Facility (or Site) Code,
and a 16-bit binary representation of the Key Code.
The following format is used:
Bit 1 is the even parity over the first 13 bits.
Bits 2 to 9 are the 8-bit Facility Code for Key Codes.
Bits 10 to 25 are the 16-bit Key Code.
Bit 26 is the odd parity over the last 13 bits.
HID Normal
The number of bits to output is determined from the information in the tag and will vary
between tags. The 26-bit or 44-bit selection does not impact on HID Tags.
HID Raw
In this Mode, the entire raw 45-bit HID Tag is output.
Keypad Model Settings (MDK900 only)
The 12-button Keypad is used to enter 5-digit PIN-codes in the range 00000 to 65535.
Wiegand protocol constraints disallow PIN-codes from 65536 to 99999. In this case the
Status LED turns Red and the Buzzer activates for 2 seconds.
The Reader can accept 1 to 4-digit PIN-codes by pressing the Hash Key (#) after you
have entered the PIN-code.
Errors made while entering the PIN-code can be corrected by pressing the Star Key (*)
followed by the correct PIN-code.
PIN code up to 5 digits with programmable facility code, output in 26-bit format.
Fixed length buffered keys from 1
– 11 output in hexadecimal format with optional
parity.
NOTE:
The output of the PIN-code keypad information is in 26-bit Wiegand format.
Fixed Length Key Output Mode
Once the specified number of keys are pressed, all the buffered keys are output in
hexadecimal format:
Key
Output
0
0000
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
1000
