Which protocol is permitted to interconnect HVAC or other systems to a network shared by the fire alarm system?

• A. BACnet
• B. Modbus
• C. KNX
• D. DALI

Answer: (A)

Interoperability between building systems is achieved with a protocol designed for sharing data across different devices and vendors. BACnet is specifically built for building automation and control networks, so it enables HVAC and other systems to connect to a network that a fire alarm system also uses. This open standard makes it possible for the fire alarm system, HVAC, and other building systems to exchange status information and, when appropriate, be controlled from a common network, while still meeting safety and integration requirements.

Other protocols like Modbus are more focused on industrial control of specific equipment, KNX is a European-building-automation standard that doesn’t have the same widespread support for fire-alarm network integration, and DALI is aimed at lighting control. They don’t offer the same level of interoperable support with fire-alarm networks as BACnet, which is why BACnet is the best choice here.