Open Supervised Device Protocol and Added Security

Open Supervised Device Protocol and Added Security

The Security Industry Association (SIA), which represents electronic and physical security solutions providers, developed the Open Supervised Device Protocol (OSDP) to help improve interoperability for access control security products.


What Are The Advantages of OSDP?

OSDP is Flexible

There are many connectivity options available under OSDP; 2-wire communications fibre optics, wireless, and TCP/IP, all of which are readily available and widely deployed. In addition, OSDP is not constrained by communication limitations such as being tied to an RS-485 twisted pair. Security specialists can utilise any full or half-duplex data communication medium available with the appropriate protocol translator and gateway.

The OSDP roadmap specification also allows for extended IP environments and also allows for cross-checking and monitoring of security platforms from different manufacturer devices and solutions, a huge advantage.

OSDP Enhances Output for Audio and Visual Feeds

More data can be displayed thanks to OSDP as it also provides a format that can be used for text displays using the card reader. There are also additional timed functions and help with improving audio feeds and other digital outputs from a legacy reader (with a conversion device) and an OSDP-compliant reader.

OSDP is Scalable

OSDP allows for up to 126 addressable devices in one RS-485 line (splitting them up across different channels). This improves the poll/response cycle times to make security tighter yet more fluid.

OSDP and AES-128

The OSDP specification has an authentication and encryption scheme in place, AES-128. This encryption secures data that is being transferred across a network to controllers and connected devices. Implementing the encryption is also straightforward in low cost embedded peripheral devices.. CMAC chaining is used for securing the channels through key management and such.

OSDP and Implementation

OSDP is a relatively new protocol; however, it is l easy to implement with card data supported in raw format, 200-bit binary and Wiegand.


OSDP has clear advantages over Weigand;
OSDP is easier to implement overall and is user-friendly.
Training is short and simple for implementing the protocol over networks and devices.OSDP is cheaper and more practical because of the minimal cable requirements. OSDP supports cable ranges up to 1200m while Wiegand only up to 152m.

OSDP uses the high-end AES-128 encryption being more secure than Wiegand.
OSDP supports two way communication between the controller and the card reader.


Why Use or Adopt OSDP?

OSDP has been supported by every major Access Control product manufacturer. SIA recommends that OSDP is particularly used in high-risk security applications. In addition, it can also be used in government use cases as it meets federal access control requirements such as PKI for FICAM.

Why Use or Adopt OSDP?

SPG S1000 Control Panel’s features an RS485 multidrop OSDP port Isolated RS232/RS485 configurable port to communicate with SPG Alarm Keypad, Sensor Board and other 3rd party devices.

To know more about OSDP and how it can help your business contact SPG Controls.


0 replies

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply

Your email address will not be published. Required fields are marked *