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81 lines
2.6 KiB
Markdown
81 lines
2.6 KiB
Markdown
---
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layout: page
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title: "Modbus"
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description: "Instructions on how to integrate Modbus within Home Assistant."
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date: 2015-04-25 9:16
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sidebar: true
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comments: false
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sharing: true
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footer: true
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logo: modbus.png
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ha_category: Hub
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ha_release: pre 0.7
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ha_iot_class: "Local Push"
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---
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[Modbus](http://www.modbus.org/) is a serial communication protocol to control PLCs (Programmable logic controller). It currently supports sensors and switches which can be controlled over serial, TCP, and UDP connections.
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## {% linkable_title Configuration %}
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To add modbus to your installation, add the following to your `configuration.yaml` file:
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For a network connection:
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```yaml
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# Example configuration.yaml entry for a TCP connection
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modbus:
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type: tcp
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host: IP_ADDRESS
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port: 2020
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```
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Configuration variables:
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- **type** (*Required*): Type of the connection to Modbus. Possible values are:
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- *tcp*: Modbus TCP protocol according to "MODBUS Messaging Implementation Guide version 1.0b" provided by Schneider Automation,
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- *udp*: Modbus TCP form, but using UDP for transport (removes the overheads required for TCP),
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- *rtuovertcp*: Modbus RTU message transmitted with a TCP/IP wrapper and sent over a network instead of serial lines.
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- **host** (*Required*): The IP address of your Modbus device, eg. 192.168.1.1.
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- **port** (*Required*): The port for the communication.
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- **timeout** (*Optional*): Timeout for slave response in seconds. (default: 3)
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For a serial connection:
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```yaml
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# Example configuration.yaml entry for a serial connection
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modbus:
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type: serial
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method: rtu
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port: /dev/ttyUSB0
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baudrate: 9600
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stopbits: 1
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bytesize: 8
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parity: N
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```
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Configuration variables:
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- **type** (*Required*): Type of the connection to Modbus.
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- **method** (*Required*): Method of the connection to Modbus.
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- **port** (*Required*): The port where your Modbus device is connected to your Home Assistant host.
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- **baudrate** (*Required*): The speed for the serial connection.
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- **stopbits** (*Required*): The stopbits for the serial connection.
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- **bytesize** (*Required*): The bytesize for the serial connection.
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- **parity** (*Required*): The parity for the serial connection.
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- **timeout** (*Optional*): Timeout for slave response in seconds. (default: 3)
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### {% linkable_title Services %}
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| Service | Description |
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| ------- | ----------- |
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| write_register | Write register. Requires `unit`, `address` and `value` fields. `value` can be either single value or an array |
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## {% linkable_title Building on top of Modbus %}
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- [Modbus Binary Sensor](/components/binary_sensor.modbus/)
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- [Modbus Sensor](/components/sensor.modbus/)
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- [Modbus Switch](/components/switch.modbus/)
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