BACnet Protocol Reference

Reference hub for BACnet discovery, BBMD design, MS/TP behavior, device identity, and field troubleshooting.

This protocol hub collects 16 pages categorized under BACnet, including reference material and task-oriented support content.

Open the BACnet knowledge base page Open unified search filtered to BACnet

Knowledge Base

BBMD

BACnet Broadcast Management Device overview covering multi-subnet discovery, BDT configuration, and FDR.

COV (Change of Value)

BACnet Change of Value subscription overview covering COV vs polling, increment configuration, and interoperability.

Device Instance

BACnet Device Instance overview covering the 0–4,194,303 range, uniqueness requirements, and common discovery failures.

FDR (Foreign Device Registration)

BACnet Foreign Device Registration overview covering remote device access via BBMD registration as an alternative to full BBMD deployment.

I-Am

BACnet I-Am service response overview covering device discovery, broadcast response content, and common integration issues.

BACnet/IP

BACnet/IP overview covering BVLL transport, UDP port 47808, multi-subnet design with BBMDs, and comparison to BACnet MS/TP.

Max Masters

BACnet MS/TP Max Masters parameter overview covering token-passing behavior, configuration impact, and common mistakes.

BACnet MS/TP

BACnet MS/TP overview covering token passing, RS-485 wiring, MAC addressing, Max Masters, and common field issues.

BACnet Objects

BACnet object types overview covering Analog Input, Analog Output, Binary Value, Multi-State Value, and other common object types used in building automation.

Token Passing

BACnet MS/TP token-passing media access overview covering token rotation, master/slave roles, and troubleshooting token loss.

Who-Is

BACnet Who-Is discovery service overview covering broadcast behavior, device instance ranges, and multi-subnet requirements.

BACnet

General BACnet wiki page covering object model, services, network layers, and integration troubleshooting context.