OSDP: Open Supervised Device Protocol

What is an OSDP?

OSDP stands for Open Supervised Device Protocol. It is a communication interface that connects a reader with a device it is linked to.

As its name implies, this protocol is open to all manufacturers of readers, controllers and software. Security Industry Association (SIA) recognizes OSDP as a standard interface along with Wiegand and Clock and Data.

Advantages over Wiegand

It has a number of advantages over Wiegand, such as:

  • It supports two-way communication between a reader and a controller. This means that a controller, a computer or an interface unit can connect with a reader and identify a malfunctioning device, manage LED indication or check a PIN-code that was entered.
  • Its connection is encrypted (OSDP supports high-end AES-128 encryption) and makes it much more secure than Wiegand and other common protocols.
  • OSDP is cheaper to install because it requires less cable. Also, this interface enables a reader to function even if it’s located 1200m away from the controller. In case with Wiegand, the distance between a reader and a controller rarely exceeds 152m.
  • It has a user-friendly interface and is easy to implement.

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