What is Wiegand?
Simple definition
Wiegand is a legacy access control reader communication format using data lines such as D0 and D1.
Why it matters in wiring diagrams
It is widely supported but is generally less modern than OSDP.
When reading a wiring diagram, this term usually affects cable choice, power path, signal path, device selection or commissioning notes.
Common mistakes
- Assuming the term means the same thing across all brands.
- Ignoring the actual terminal names in the manufacturer manual.
- Not documenting how the term applies to the final installed system.