---
title: "Modbus"
description: "Modbus is a built-in integration for Home Assistant. It has 18.6k installs sharing analytics and works locally."
canonical: "https://vulpo.app/integrations/core/modbus"
url: "https://vulpo.app/integrations/core/modbus.md"
last-updated: "2026-10-22"
version: "1.4"
---

# Modbus

> Modbus is a built-in integration for Home Assistant. It has 18.6k installs sharing analytics and works locally.

Modbus is a built-in Home Assistant integration that connects to devices over the Modbus protocol. It works locally and is set up in the configuration file. Data from Modbus devices can appear as binary sensors, climate devices, covers, fans, lights, sensors and switches. It also provides actions to write to a coil and to a holding register. Further actions reload all Modbus entities and stop a Modbus hub.

Automatic summary of Home Assistant's source code. Something wrong? [Get in touch](https://vulpo.app/contact)

Set up in configuration.yaml. See [the documentation](https://www.home-assistant.io/integrations/modbus/).

## Supports

- **Works locally**: Talks to your devices on your own network. No vendor cloud in between.
- **Set up in YAML**: Added through configuration.yaml.
- **Updated with Home Assistant**: Ships and updates with every Home Assistant release.

## Setting it up

It is set up in configuration.yaml, not in the UI.

## Actions

- **Reload**: Reloads all Modbus entities.
- **Stop**: Stops a Modbus hub.
  Fields: Hub
- **Write coil**: Writes to a Modbus coil.
  Fields: Address, Hub, Server, State
- **Write register**: Writes to a Modbus holding register.
  Fields: Address, Hub, Server, Value

## At a glance

- Kind: Built-in integration
- Category: [Hubs and protocols](https://vulpo.app/integrations/category/hubs-and-protocols.md), Building automation
- Number: 18.6k installs sharing analytics
- Connection: Works locally
- Upkeep: Part of Home Assistant
- Needs: Built into Home Assistant
- Domain: `modbus`
- Source: <https://www.home-assistant.io/integrations/modbus/>

In Vulpo: Light card, Quick Toggle card, Cover card, Climate card, Apple Watch, Control Center, Climate Live Activity (Pro)

[Widgets & Live Activities in Vulpo](https://vulpo.app/features/widgets-and-live-activities)

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation. [About these numbers](https://vulpo.app/integrations/about)

Last updated 2026-10-22. Source: https://vulpo.app/integrations/core/modbus

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