Wiegand in Access Control
What is Wiegand?
In the realm of access control “Wiegand” can be used to describe:
- A Reader to controller hardware interface
- A Reader Protocol
- A Card Format
- A Type of Reader
- A Type of Credential
The term Wiegand gets its name from a German born engineer John R WiegandHistory
Protocol / Format
The term Wiegand gets its name from a German born engineer John R Wiegand, who invented the special wire used in Wiegand cards that could be read using a Wiegand Reader. The output from this reader was over two wires labelled “Data 0” (D0) and “Data 1” (D1).
This Wiegand interface and protocol was then later adopted by the new RFID technologies so that they could be easily retro fitted to existing access control systems.
The Wiegand cards and readers are no longer in manufacture but the hardware interface and formats are still in use today by many types of RFID and even some Biometric readers.