Preface

Readers

This guide introduces the raw HEX payload protocol used to communicate with the device. It is intended for developers or users who integrate the device without Milesight gateways or codecs.

This document does not describe physical installation, HVAC wiring, and configuration steps in detail. Please use it together with the related documents.

Related Document

Document Description
WT201 & WT211 User Guide Provides introductions, compatibility check, wirings, installation and configuration steps.
WT201 & WT211 BACnet Object List Lists the BACnet objects exposed through a Milesight gateway with the BACnet feature enabled.
WT201 & WT211 Payload Protocol (JSON) Provides the decoded JSON format for uplink data and downlink commands when using the codec provided by Milesight.

Copyright Statement

This guide may not be reproduced in any form or by any means to create any derivative such as translation, transformation, or adaptation without the prior written permission of Xiamen Milesight IoT Co., Ltd (Hereinafter referred to as Milesight).

reserves the right to change this guide and the specifications without prior notice. The latest specifications and user documentation for all Milesight products are available on our official website http://www.milesight.com

Revision History

Release Date Version Revision Content
Jan. 17, 2025 V2.0 Initial version based on hardware v2.x:
  1. Change room card switch input type and name;
  2. Add D2D data receiving feature;
  3. Add compressor and auxiliary heat linkage feature;
  4. Add Temperature Control Mode Enable and Target Temperature Resolution feature;
  5. Add dual target temperature mode under Auto mode;
  6. Add downlink feature: Temporary unlock, W2/Y2 auxiliary mode, Relay change report, Send humidity data.
  7. Add schedule type: Occupied, Unoccupied, ECO.
  8. Update the definition of O/B;
  9. Update compressor protection to system protection;
  10. Add temperature control mode and target temperature tolerance in the schedule.
May 20, 2025 V2.1 Add downlink command to enable/disable screen display
May 31, 2026 V2.2
  1. Add data source to periodic report;
  2. Support reporting data source alarm when timeout;
  3. Add custom temperature control stages;
  4. Add occupancy mode parameters, central target temperatures and adjustment tolerances;
  5. Add unilateral tolerance;
  6. Add timezone offset;
  7. Add offline unlock;
  8. Add downlink commands: switch data source, child lock enable/disable, screen time display enable/disable, time mode, timezone index, etc.