BACnet/IP · MS/TP Modbus RTU · TCP

Plug into
any building.
Any protocol.

ZedBee integrates directly with your existing BMS, chillers, AHUs, and field devices — without ripping out infrastructure. Native BACnet and Modbus support means zero custom middleware, zero compatibility risk.

Live integration topology
AHU / FCU
BACnet MS/TP
Chiller Plant
Modbus RTU
BMS / DDC
BACnet/IP
ZedBee
Gateway
ZedBee Cloud
MQTT / REST
Analytics
Dashboard
ECBC Reports
Compliance
Mapped registers
40001 — Zone Temp 40003 — SP 40005 — Valve % AI:1 — Flow AO:2 — Damper BI:4 — Occupancy
Protocol deep-dive
Two protocols.
One unified layer.
BACnet
ANSI/ASHRAE 135 · ISO 16484-5
Transport layersIP · MS/TP · Ethernet
DiscoveryWho-Is / I-Am auto-scan
COV subscriptionsSupported
Max objectsUnlimited per gateway
Read / WriteReadProperty · WriteProperty
Analog InputAnalog OutputBinary Input Binary OutputMulti-StateSchedule Trend Log
Modbus
RTU · TCP/IP · ASCII
Physical layerRS-485 · RS-232 · Ethernet
Slave address range1 – 247 per bus
Poll interval100 ms – configurable
Register mappingCustom CSV / auto-template
Function codesFC01 02 03 04 05 06 15 16
Coil (0x)Discrete Input (1x) Input Reg (3x)Holding Reg (4x) Float32Int16 / Int32
BACnet object support
Every object type, natively read and written
AI · AO · AV
Analog objects
Zone temp, setpoint, valve position, airflow rate
BI · BO · BV
Binary objects
On/off states, alarms, occupancy signals, fault flags
MSI · MSO · MSV
Multi-state objects
Fan speed modes, chiller staging, control modes
TLOG
Trend log
Historical data pull for energy baselining and audit
SCH
Schedule
Read and override BMS occupancy schedules
NC
Notification class
Alarm routing and change-of-value event handling
Deployment workflow
From first cable to live data in under 2 hours
01
Network scan
ZedBee auto-discovers all BACnet devices via Who-Is broadcast. Modbus slaves enumerated by address sweep on RS-485 bus.
02
Object mapping
Point list imported via CSV or auto-generated from device scan. Register-to-tag mapping configured in the web console.
03
Poll & validate
Live values stream to the dashboard. Engineering team validates readings against BMS display — no blind trust.
04
AI layer activates
ZedBee's Delta-T and zone-control algorithms begin operating on live sensor data. Setpoint writes go via BACnet WriteProperty or Modbus FC06/FC16.
Tested compatibility
Works with the systems already in your building
Johnson Controls
Metasys / FX / NAE
Schneider Electric
EcoStruxure / TAC
Honeywell
EBI / Niagara / WEBs
Blue Star
Chiller / AHU / FCU
Carrier / Trane
BACnet native
Siemens
Desigo CC / PXC
Tridium Niagara
N4 · JACE
Custom PLCs
Any Modbus RTU slave
Why it matters
No rip-and-replace.
Pure retrofit value.
01
Preserve your BMS investment
ZedBee reads from and writes to your existing BACnet/Modbus points. The BMS continues working as before — ZedBee adds an intelligence layer on top.
02
No controller replacement
Field controllers, VAV boxes, and FCU actuators stay in place. ZedBee overrides setpoints via standard protocol writes — no hardware swap.
03
Works with legacy infrastructure
RS-485 Modbus RTU buses from 1990s-era equipment are fully supported. If it speaks Modbus, ZedBee can read and control it.
04
Parallel operation, always
ZedBee operates in parallel with the BMS — never replacing it. If the gateway goes offline, the BMS resumes full control automatically.
Get integrated

Already have a BMS? We'll connect to it.

Share your existing protocol stack and device list — our team will confirm compatibility and map your point list before the first site visit.

© 2025 ZedBee Technologies · IIT Madras Research Park, Chennai