Topics included in this article:
- Wiegand
- OSDP
- Differences between Wiegand and OSDP
- Rhombus Access Control Compatibility
- Helpful Links
- Contact Support or Sales
Wiegand
Wiegand is a technology invented in the 1970s designed for access control. It uses magnetic fields to transmit data from the credential to the credential reader. It utilizes one-way communication and only communicates from the reader to the controller. Wiegand devices are widely used in security systems because of their reliability and durability.
OSDP
OSDP stands for Open Supervised Device Protocol. OSDP is a communication protocol developed by the SIA (Security Industry Association) to provide more secure access control communication. OSDP uses the RS-485 wiring interface to transmit data between devices. The ultimate purpose of OSDP is to link different access control devices (controllers, readers, and credentials). Rhombus Credential Readers, DR20, and DR40 use OSDP.
Differences between Wiegand and OSDP
- OSDP is more secure than Wiegand because of its AES 128-bit encryption (required for Federal Government applications)
- OSDP supports two-way communication between the reader and controller
- Wiegand has one-way communication; it is only reader-to-controller
- OSDP requires less cable during installation, and therefore, cheaper
Rhombus Access Control Compatibility
The DC20 (Rhombus' Access Control controller) is compatible with both Wiegand and OSDP readers. The diagram below shows the ports available to wire either type of credential reader. Wiring guides for RS-485 ports is highlighted in the orange box, and Wiegand ports are in the yellow box:
Helpful Links
- Installing a Wiegand Reader to the DC20
- Installing/Registering the DR20
- Installing/Registering the DR40
Contact Support or Sales
Have more questions? Contact Rhombus Support at +1 (877) 746-6797 option 2 or support@rhombus.com.
Interested in learning more? Contact Rhombus Sales at +1 (877) 746-6797 option 1 or sales@rhombus.com.
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