WB-M1W2 v.3 firmware changelog

Overview

Device firmware can be updated over Modbus; see the instructions.
This page lists changes since the beginning of 2022. Earlier changes are in Firmware Changelog.

Changelog

4.36.0 (13.08.2026)

• Added DS18B20 temperature correction registers.
• ERRMODBUS012: Fixed possible interruption of Fast Modbus event transmission.

4.35.3 (01.07.2026)

• Improved Fast Modbus arbitration timing stability.
• Fixed Modbus issues:
  • ERRMODBUS008: Unexpected behaviour with long request frames
  • ERRMODBUS009: Unexpected behaviour when reading near address 0xFFFF in continuous-reading mode
  • ERRMODBUS010: Incorrect request validation and handling of invalid requests
  • ERRMODBUS011: Incorrect handling of invalid Fast Modbus event-configuration requests

4.35.2 (29.05.2026)

• Fixed event loss when two devices on the same bus transmit events simultaneously.

4.35.1 (28.04.2026)

• Added FlashFS diagnostic service registers
• Optimised stack usage when requesting many registers

4.35.0 (23.03.2026)

• Added support for multiple sensors on each channel
• Improved reliability of saving device state at power loss
• Optimised filesystem operation
• Optimised power-loss handling

4.34.0 (24.12.2025)

• Added stack and RAM monitoring service registers
• Added a service register for the last MCU reset cause
• Added a firmware update counter service register
• Improved MCU supply voltage measurement accuracy on new devices
• Added device batch number registers

4.33.6 (30.04.2025)

• Added a factory-reset register
• Fixed loss of Modbus response under very frequent requests (observed on WB-MAP12E)
• Reduced the Git information area to 25 registers (50 characters)
• Fixed unexpected behaviour when invalid values are written to some registers ERRMODBUS003.

4.33.5 (11.11.2024)

• Added parity checking for received Modbus data ERRMODBUS006

4.33.4 (12.08.2024)

• Fixed the strong pull-up remaining enabled after an input mode change ERRM1W2004

4.33.3 (26.06.2024)

• Changed the WB-M1W2 v.3 device model string

4.33.2 (21.05.2024)

• WB-M1W2 v.3 support

4.33.1 (13.05.2024)

4.33.0 (03.04.2024)

4.32.3 (29.03.2024)

4.32.2 (11.12.2023)

4.32.1 (11.09.2023)

4.32.0 (15.08.2023)

4.29.1 — 4.30.0 and 4.31.0 (testing)

4.29.0 (03.03.2023)

4.28.0 — 4.28.1

4.27.0 (21.02.2023)

4.24.0 — 4.26.0

4.23.1 (05.12.2022)

4.23.0 (14.11.2022)

4.18.10 — 4.22.1+wb1

4.18.9 (30.06.2022)

4.18.6 — 4.18.8

4.18.4 (25.02.2022)

4.18.2 — 4.18.3

4.18.1 (31.01.2022)

4.17.7 — 4.18.0

4.17.6 (26.01.2022)

4.17.3 — 4.17.5