What Wiegand is
Wiegand is the long-standing way readers send card numbers to a controller. It is simple and widely supported, but it is one-way, unencrypted, and the controller cannot tell if a reader has been tampered with or replaced.
What OSDP adds
- Two-way communication, so the controller can supervise the reader
- OSDP Secure Channel encryption between reader and controller
- Fewer wires, often a four-conductor cable
- Remote reader configuration and LED/buzzer control
Migrating from Wiegand
Many modern readers support both protocols, and many controllers, including current Mercury-based boards, support OSDP. A migration usually starts with checking controller support and cable condition, then replacing readers door by door.
When to move
If you are replacing readers anyway, choose OSDP-capable models. If your controllers are older, plan the controller upgrade and reader change together.
Related services
Need access control service?
Call or text Pacific Access Systems. 714-584-7541
Commercial service across Orange County and Los Angeles County, Monday–Saturday, 7:00 AM–5:00 PM.