BACnet/IP Nodes

Read property values from BACnet/IP building automation devices and integrate building data into your orchestration pipelines.

Configuration Quick Reference

Field	What you choose	Details
Parameters	Connection, Function, Function Parameters, Timeout Override	Select the BACnet connection profile, choose a read function, configure function parameters with expression support, and optionally override timeout.
Settings	Description, Timeout (seconds), Retry on Timeout, Retry on Fail, On Error	Node description, maximum execution time, retry behavior on timeout or failure, and error handling strategy. All execution settings default to pipeline-level values.

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BACnet Read Node

BACnet Read Node

Read one or more property values from BACnet objects using ReadPropertyMultiple. Each read item is identified by a user-defined name, which becomes the key in the result output.

Supported Function Types:

Function Name	Purpose	Common Use Cases
Read Properties (bacnet.read)	Read property values from one or more BACnet objects in a single request	Temperature readings, HVAC status, energy meters, alarm states

Node Configuration

Parameter	Type	Required	Description
Connection	Selection	Yes	BACnet/IP connection profile to use
Function	Selection	Yes	Read function from the selected connection
Function Parameters	Dynamic	Varies	Auto-populated from the function schema. See your BACnet/IP connection functions for full parameter details.
Timeout Override	Number (seconds)	No	Override the default function timeout

All function parameters support expression syntax ({{ expression }}) for dynamic values from the pipeline context.

Input

The node receives the output of the previous node as input. Input data can be referenced in function parameter expressions using $input.

Output Structure

On success the node produces:

{
  "success": true,
  "functionId": "<function-id>",
  "data": { ... },
  "durationMs": 42,
  "timestamp": "2026-01-15T08:30:00Z"
}

Field	Type	Description
success	boolean	true when the function executed without errors
functionId	string	ID of the executed function
data	object	Function-specific result data (see below)
durationMs	number	Execution time in milliseconds
timestamp	string	ISO 8601 / RFC 3339 UTC timestamp

Function-Specific Output Data

Read Properties (bacnet.read):

{
  "results": {
    "Zone Temperature": {
      "object_type": 0,
      "object_instance": 1,
      "property_id": 85,
      "value": 72.5
    },
    "Damper Position": {
      "object_type": 1,
      "object_instance": 10,
      "property_id": 85,
      "value": 45.0
    },
    "Occupancy Sensor": {
      "object_type": 3,
      "object_instance": 5,
      "property_id": 85,
      "value": 1
    }
  }
}

Each result entry is keyed by the Item Name defined in the read function:

Field	Type	Description
object_type	number	BACnet object type code that was read
object_instance	number	Object instance number
property_id	number	BACnet property ID that was read
value	any	The property value returned by the device
error	string	Error message (present only if the individual item failed)

Read Item Configuration

Each read item in the function is configured with:

Field	Type	Required	Default	Description
name	String	Yes	—	Unique name for this item — used as the key in results
object_type	Number	Yes	—	BACnet object type code (e.g., 0 = AnalogInput, 3 = BinaryInput)
object_instance	Number	Yes	—	Object instance number
property_id	Number	No	85 (Present_Value)	BACnet property to read

Supported Object Types

Code	Name	Typical Use
0	AnalogInput	Temperature sensors, pressure sensors, flow meters
1	AnalogOutput	Valve positions, damper commands, setpoints
2	AnalogValue	Internal calculated values, configurable setpoints
3	BinaryInput	Occupancy sensors, switch states, alarms
4	BinaryOutput	Relay commands, on/off controls
5	BinaryValue	Internal binary states, mode flags
8	Device	The device itself (instance = Device ID)
12	Loop	PID control loops
13	MultiStateInput	Multi-position switches, fan speed states
14	MultiStateOutput	Multi-position actuator commands
17	Schedule	Weekly schedules
20	TrendLog	Historical data logs

Common Property IDs

ID	Name	Description
85	Present_Value	Current value — the most commonly read property
77	Object_Name	Human-readable name of the object
28	Description	Text description of the object
36	Event_State	Current alarm/event state
103	Reliability	Reliability status of the object
111	Status_Flags	Bitmask: in-alarm, fault, overridden, out-of-service
117	Units	Engineering units (e.g., degrees-Fahrenheit, percent)

ReadPropertyMultiple

The BACnet Read node uses the ReadPropertyMultiple service to read all configured items in a single BACnet request. This is more efficient than reading properties one at a time, especially when acquiring data from many objects on the same device.

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Settings Tab

Setting	Type	Default	Description
Description	Text	—	Optional description displayed on the node
Timeout (seconds)	Number	Pipeline default	Maximum time the node may run before timing out
Retry on Timeout	Toggle	Pipeline default	Automatically retry the node if it times out
Retry on Fail	Toggle	Pipeline default	Automatically retry the node if it fails
On Error	Selection	Pipeline default	Error strategy: stop the pipeline, continue to the next node, or follow the error output path

When left at their defaults, these settings inherit from the pipeline-level execution configuration.