MorphoAccess® SIGMA Series - Administrator Guide
Access Control by Authentication
2017_2000025464-v03
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July 17
Wiegand Frame Configuration
When set up to communicate with Wiegand protocol, the MorphoAccess® SIGMA Family
terminal can handle several data formats for reading Wiegand string; refer to “Wiegand Format
and Associated Values”.
The default format of Wiegand string is Standard 26 Bits. An authentication is initiated through
User ID input from Wiegand string, which consists below information:
Total Bits: The number of Wiegand bits in the Wiegand string (maximum 512 bits length)
ID Start Bit: the start bit of the ID Field (where the first bit is Bit 0)
Total ID Bits: the number of bits in the ID Field (must be contiguous bits).
Using these parameters, when a card is presented to the terminal, it attempts to decode the ID
Field and uses that information as the User Identifier (User ID of a template). All Site codes,
Parity, and any other data are ignored.
Using the decoded ID, the terminal will verify corresponding User IDs stored in the database.
If the ID is not found in the terminal database, the verification attempt fails and Wiegand output
string is set to the Wiegand Port in the configured format. There is no communication with
central access controller.
If the ID is valid and a successful verification is performed, the Wiegand Output String is sent to
Wiegand port in the configured format.
Note: For sending Wiegand Output, it is required to enable ‘Activate Wiegand Output’
parameter from Webserver. If this parameter is disabled, then no Wiegand output is sent by
terminal in the event of a verification fail or pass.