Certified Energy Manager Practice Exam

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What is the communication link referred to in ASHRAE Standard 135?

BACnet, Building Automation and Controls Network
EIB, European Installation Bus
LON, Local Operating Network
Modbus, Communication Protocol

The correct answer is: BACnet, Building Automation and Controls Network

The communication link referred to in ASHRAE Standard 135 is BACnet, which stands for Building Automation and Controls Network. BACnet is a data communication protocol specifically designed for building automation and control systems, allowing different devices and systems within a building to communicate efficiently and effectively. This standard enables interoperability between products and manufacturers, which is crucial in modern building management for optimizing energy usage and enhancing operational efficiency. BACnet supports a wide range of applications, including HVAC systems, lighting control, security, fire alarm systems, and other building automation needs. Its widespread adoption is due to its open nature, allowing various systems and devices from different manufacturers to work together seamlessly, leading to more integrated and intelligent building environments. The other communication protocols mentioned, such as EIB, LON, and Modbus, while significant in their own contexts, do not specifically align with the standards outlined in ASHRAE 135, which focuses primarily on BACnet as the chosen method for facilitating communication in building automation systems. Understanding BACnet's role helps building energy managers make informed decisions regarding system integration and energy efficiency strategies in their facilities.