What Protocols Are Used in Building Automation?
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The Founder's Explanation (Teach Exactly This Way)
"An international airport — people from many countries, each speaking a different language. To get anything done you need common languages and translators at the desks. A building is that airport. Devices come from many makers, each with its own protocol. BACnet, Modbus, KNX — the languages. Gateways are the translators. Prefer open languages, so anyone can talk."Teaching the Concept
The International Airport At an international airport, travellers speak many languages. Things only work because there are common languages and translators at the desks. A building full of devices from different makers is that airport — each device speaks its own protocol. Learn the languages, then bridge the gaps with gateways. The Protocol Landscape ``` BACnet the building-native standard (HVAC, IP/MS-TP) Modbus simple register-level device integration LonWorks older distributed control networks KNX lighting, blinds, room control (esp. EU) MQTT lightweight IoT / cloud telemetry OPC UA industrial, secure, modelled data ``` Bridging Them ``` Mixed devices -> GATEWAY -> one head-end Prefer NATIVE + OPEN protocols to avoid lock-in Use gateways only where a device cannot go native ``` Protocols are the languages of a building — the open ones let it keep talking no matter who supplied the devices.Related Topics
- What is a protocol in BMS? — the shared language controllers use to talk
- Modbus to BACnet gateway explained — how a gateway translates protocols
- Browse all Protocols topics — more from this section of the EnSmart BMS Library
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