Wiring Example for OSDP Readers
Benefits of using OSDP
OSDP has several benefits over traditional reader communication protocols (Wiegand, clock and data).
• Simplified Cabling: Readers that communicate with OSDP Readers use less conductors than other
methods. You can typically use four (4) conductor twisted pair such as Belden 3107A or even CAT6
cable. Any cable that meets the TIA485/EIA-RS-485 specification should be able to work.
• Encryption: OSDP supports 2-way encrypted communication via AES-128. This prevents specific
attack vectors such as ease dropping and spoofing.
• Tamper and Disconnection Detection: Traditional readers don't normally come with a way to detect tampering or disconnection (such as someone removing the reader from its mounted position).
The ones that did would require additional pairs to accomplish this and usually had additional costs.
Because OSDP is two-way communication, the access control panel can detect if the reader is disconnected or removed from its mounted position.
• Longer Distances: Wiegand readers typically only supported a maximum length of 500'. OSDP
uses RS-485, which theoretically supports up to 2000' (as long as you had DC power closer than
500').
For step-by-step instructions for configuring VAX to use OSDP instead of Weigand, please refer to Chapter 29, page 268 of the VAX Tech Guide at the following link: https://20754163.fs1.hubspotusercontent-na1.net/hubfs/20754163/Product%20Resources/VAX-TechGuide.pdf