What is the difference between open and closed protocols in BAS?

What is the difference between open and closed protocols in BAS?

• A. Open protocols (e.g., BACnet) allow interoperable devices from multiple vendors.
• B. Closed protocols are vendor-specific.
• C. Open protocols are less secure than closed protocols.
• D. Open protocols are only used for lighting control.

Answer: (B)

Open protocols in BAS are standards that let devices from different vendors communicate using the same language, enabling interoperability. Closed protocols are controlled by a single vendor and typically work only with that vendor’s equipment. Saying that closed protocols are vendor-specific highlights the essential difference: openness enables cross-vendor compatibility, while a vendor-specific (closed) approach restricts interoperability to that vendor’s products. The other statements aren’t as accurate about the core difference: security isn’t inherently determined by open vs closed, and open protocols aren’t limited to lighting control.

Open protocols in BAS are standards that let devices from different vendors communicate using the same language, enabling interoperability. Closed protocols are controlled by a single vendor and typically work only with that vendor’s equipment. Saying that closed protocols are vendor-specific highlights the essential difference: openness enables cross-vendor compatibility, while a vendor-specific (closed) approach restricts interoperability to that vendor’s products. The other statements aren’t as accurate about the core difference: security isn’t inherently determined by open vs closed, and open protocols aren’t limited to lighting control.