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When set up to communicate with Wiegand protocol, the MorphoAccess™
can handle multiple data format.
Default format (26-bit) is described in appendix 2.
The Wiegand frame format is defined using six configuration keys.
Different protocol can be defined for input and output.
Wiegand frame timings are not customizable. Additional security
(ciphering) is not handled. All Wiegand protocols are reverse.
Frame definition
Here after are listed the customizable parameters of a Wiegand frame.
- Length
A Wiegand frame can contain up to 128 bits.
- Control bits
In a Wiegand frame, start and stop bits are used as control bits. They can
be fixed to 0 or 1 or be used as parity (odd or even) bits calculated over
bits of the frame.
- Data
In the Wiegand protocol, three data are handled: the Site code (also called
Facility code or Comparison number), the ID (also called Badge number or
Sequence number) and a custom data. Data can have a variable bit size
and can be located anywhere in the frame. Data are inserted in the frame
MSB first.
Configuration keys.
The corresponding configuration keys are in file /cfg/Wiegand in either
section IN or OUT:
Wiegand frame Personnalization
/cfg/ Wiegand /IN or OUT
Length
1-128 Defines the number of bits of the frame.
Start
0.0
1.0
2.n
3.n
4.0
Defines the start control bit.
Reset to 0.
Set to 1.
Even parity calculated over the n first bits.
Odd parity calculated over the n first bits.
No start bit
80
SAGEM Défense Sécurité document. Reproduction and disclosure forbidden. SK-0000011145-05
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