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Modbus in Home Assistant

modbus part of Home Assistant since pre 0.7

Local, polling

Modbus is an official Home Assistant integration for Hub and Modbus. Talks to the device on your own network and asks for changes at regular intervals.

Facts about this integration

Compatible with Home Assistant
yes, official integration
Connection
Local, polling – Talks to the device on your own network and asks for changes at regular intervals.
Setup
in configuration.yaml
Kind
Integration
Installations
18,786 (2.6 % of the installations that share statistics)
Categories
Hub, Modbus
Provides
Binary sensor, Climate, Cover, Fan, Light, Sensor, Switch
Python packages
pymodbus==3.13.1, modbus-connection[tmodbus]==4.12.7, tmodbus==1.1.0

Setup

  1. This integration is set up in configuration.yaml, not in the user interface.
  2. The documentation lists the exact entries; restart Home Assistant after adding them.

Known issues and fixes

5 open issues and 7 bug fixes in the last twelve months are recorded for Modbus in the Home Assistant issue tracker. If something does not work, update first: the most recent fix shipped with Home Assistant 2026.10.2.

Open

  • open Reported problem #128554 since October 17, 2024 · 38 reactions · 49 comments · #128554
  • open Reported problem #169963 since May 6, 2026 · 0 reactions · 3 comments · #169963
  • open Reported problem #185789 since October 11, 2026 · 0 reactions · 1 comment · #185789
  • open Reported problem #182426 since September 16, 2026 · 0 reactions · 1 comment · #182426
  • open Reported problem #182262 since September 14, 2026 · 0 reactions · 1 comment · #182262

Fixed

Source: the issue tracker of Home Assistant, as of October 27, 2026. The sentences are written by a language model from the titles of the issues; the reports themselves are on GitHub.

Check a specific device for known problems in the product check →

Source of this entry: the official documentation of the integration

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