Overview
Introduction
When the device is integrated into a BACnet system through a Milesight gateway with the BACnet feature enabled, the BMS can read device status and write supported parameters via BACnet objects.
This document lists the supported BACnet objects, object types, default values, value ranges, engineering units, and remarks for WT201 and WT211 smart thermostats.
Prerequisites
Before using the BACnet objects listed in this guide, ensure that the following prerequisites are met:
- The thermostat has been installed, powered on, and configured according to the user guide.
- The thermostat is added to a Milesight LoRaWAN® gateway and has joined the network.
- The Milesight gateway has updated the payload codec to the latest version.
- The Milesight gateway network server and BACnet features are enabled and configured correctly.
- The BMS can communicate with the Milesight gateway through BACnet/IP.
- The required BACnet objects have been enabled or added on the gateway BACnet object page.
Important: The thermostat does not connect directly to a
BACnet network by itself. BACnet integration is implemented through a Milesight
LoRaWAN® gateway with the BACnet feature enabled.
How to Read the Object List
| Column | Description |
|---|---|
| Object Name | Name of the BACnet object displayed or configured in the gateway/BMS. |
| Object Type | BACnet object type. See BACnet Object Type below. |
| Default Value | Default value of the object after the device is reset or initialized. |
| Range Value | Supported value range or enumerated values for writable objects. For objects with enumerated values, the BMS should write the numeric value rather than the text label. |
| Unit | Engineering unit. The number in brackets indicates the BACnet engineering unit identifier used by the gateway, such as °C (62). |
| Remark | Additional description, functional note, or related parameter name. |
BACnet Object Type and Access Mode
The following BACnet object type abbreviations and corresponding access modes are used in this guide.
| Abbreviation | BACnet Object Type | Access Mode |
|---|---|---|
| AI | Analog Input | R |
| AO | Analog Output | W |
| AV | Analog Value | RW |
| BI | Binary Input | R |
| BO | Binary Output | W |
| BV | Binary Value | RW |
| CSV | Character String Value | R |
| MSI | Multi-state Input | R |
| MSO | Multi-state Output | W |
| MSV | Multi-state Value | RW |
| Access Mode | Description |
|---|---|
| R | Read-only. The BMS can read the object value. |
| W | Write-only. The BMS can write a value to trigger an action or configure a parameter. |
| RW | Read/Write. The BMS can read the current value and write a supported value. |
Note: Write operations may change HVAC operation. Verify the target
object, value range, engineering unit, and current control permission before writing any
value from the BMS.