What Is BACnet
BACnet (Building Automation and Control Networks) is an open communication protocol standard developed by ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) and adopted by ISO and ANSI. It was designed specifically for building automation systems and is the dominant communication standard in commercial building controls.
BACnet enables interoperability between building automation equipment from different manufacturers. A BACnet-enabled chiller from one vendor can communicate with a BACnet-enabled building management system from another vendor without proprietary translation software.
BACnet is used to monitor and control:
- HVAC equipment: chillers, air handling units, variable air volume (VAV) boxes, fan coil units
- Lighting control systems
- Fire and life safety systems
- Access control and security systems
- Metering and energy monitoring equipment
- Environmental sensors (temperature, humidity, CO₂, airflow)
BACnet Protocol Variants
| Variant | Transport | Typical Use |
|---|---|---|
| BACnet/IP | Ethernet / TCP-IP | Modern equipment, building-wide LAN networks |
| BACnet MS/TP | RS-485 serial bus | Field-level devices, older equipment, cost-constrained applications |
| BACnet over ARCNET | ARCNET | Legacy installations (uncommon in new deployments) |
| BACnet/SC | Secure Connect (TLS) | Emerging secure variant for cloud-connected BMS |
BACnet/IP is the dominant variant in enterprise and enterprise-class data center environments. BACnet MS/TP is common at the field device level — VAV boxes, room controllers, and similar devices that communicate over a shared RS-485 bus.
Industries That Use BACnet
Commercial Buildings
Office buildings, retail properties, hotels, and mixed-use developments use BACnet for HVAC control, lighting management, and energy monitoring. Facilities teams managing multi-building portfolios use BACnet monitoring to maintain centralized visibility without a dedicated operator at each location.
Data Centers
Enterprise data centers and colocation facilities use BACnet for HVAC and cooling infrastructure — chillers, computer room air conditioning (CRAC) units, in-row cooling systems, precision cooling units, and related equipment. BACnet monitoring is a core data center infrastructure management (DCIM) function.
Healthcare Facilities
Hospitals and healthcare facilities monitor environmental conditions, HVAC systems, and critical building infrastructure via BACnet. Pressure differentials in isolation rooms, temperature in pharmaceutical storage, and HVAC performance in critical care areas are common BACnet monitoring use cases.
Higher Education
University campuses use BACnet across classroom buildings, laboratories, residence halls, and facilities infrastructure. Centralized BACnet monitoring enables facilities teams to manage multi-building energy consumption and equipment maintenance.
Industrial Facilities
Manufacturing plants and industrial facilities that include significant HVAC and climate-controlled spaces (cleanrooms, storage environments) use BACnet for building infrastructure alongside industrial protocols for process equipment.
How Mango by Radix IoT Implements BACnet
All protocol drivers, including the BACnet driver, are included in a standard Mango by Radix IoT installation and covered by the license. There are no separate driver purchases, per-protocol licenses, or add-on fees. Mango by Radix IoT includes a native BACnet driver that communicates directly with BACnet/IP and BACnet MS/TP devices without requiring a protocol gateway or translation middleware.
BACnet Device Discovery
Mango by Radix IoT performs BACnet Who-Is broadcasts to discover devices on the network, then reads the device object list to enumerate available data points (BACnet objects). This auto-discovery process reduces manual configuration time when connecting to large BACnet installations.
BACnet Object Support
Mango by Radix IoT reads and monitors standard BACnet object types including:
- Analog Input / Analog Output / Analog Value
- Binary Input / Binary Output / Binary Value
- Multi-State Input / Multi-State Output / Multi-State Value
- Schedule, Calendar, Notification Class
BACnet MS/TP Support
For field-level MS/TP devices, Mango by Radix IoT connects via a serial interface (or Ethernet-to-serial gateway). This enables monitoring of VAV boxes, room controllers, and other devices that do not have an Ethernet interface.
Polling and COV
Mango by Radix IoT supports both polling (reading device values at configurable intervals) and Change of Value (COV) subscription, the BACnet mechanism by which devices push updates to the monitoring system when values change, reducing unnecessary polling traffic.
COV is supported on a per-point basis through an opt-in setting on each point. Each data source has a configurable lease timeout with automatic resubscription. A small number of object types, including accumulator, averaging, and schedule, are excluded from COV support.
Trend Log objects. Mango by Radix IoT can read the present value of a Trend Log object in the same way as any other BACnet object. It does not implement the BACnet ReadRange service, so it does not retrieve historical log buffer records from a device’s onboard trend log, and it does not expose its own Trend Log objects to other BMS clients. Historical data is retained in the Mango by Radix IoT historian rather than imported from device trend logs.
Use Cases: BACnet + Mango by Radix IoT
Data Center Cooling Monitoring
Mango by Radix IoT connects to BACnet-enabled chillers, CRAC units, and cooling towers in enterprise data centers. Operators monitor supply and return water temperatures, chiller efficiency (kW/ton), cooling unit alarms, and environmental conditions across server halls — all from a single dashboard.
Multi-Site Commercial Building Management
Facilities teams managing office portfolios or retail chains connect Mango by Radix IoT to BACnet systems across dozens of buildings. A single operator view shows HVAC status, alarm conditions, and energy consumption across all sites simultaneously, with drill-down to individual buildings or equipment.
Healthcare Critical Environment Monitoring
Hospitals use Mango by Radix IoT with BACnet to monitor temperature, humidity, and pressure differential in operating rooms, isolation rooms, pharmacies, and sterile processing areas. Alarm conditions trigger notifications to facilities staff and can be logged for regulatory compliance.
Energy Management
BACnet metering devices report real-time energy consumption at the circuit, floor, or tenant level. Mango by Radix IoT aggregates consumption data, identifies anomalies and waste, and provides trend analysis for energy management programs and sustainability reporting.