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83 lines
2.4 KiB
Markdown
83 lines
2.4 KiB
Markdown
---
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layout: page
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title: Modbus Sensor
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description: "Instructions how to integrate Modbus sensors into Home Assistant."
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date: 2015-08-30 23:38
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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: Sensor
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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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The `modbus` sensor allows you to gather data from [Modbus](http://www.modbus.org/) registers.
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To use your Modbus sensors in your installation, add the following to your `configuration.yaml` file:
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```yaml
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# Example configuration.yml entry
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sensor:
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platform: modbus
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registers:
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- name: Sensor1
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unit_of_measurement: °C
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slave: 1
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register: 100
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- name: Sensor2
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unit_of_measurement: mg
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slave: 1
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register: 110
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count: 2
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- name: Sensor3
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unit_of_measurement: °C
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slave: 1
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register: 120
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register_type: input
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data_type: float
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scale: 0.01
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offset: -273.16
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precision: 2
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```
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Configuration variables:
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- **registers** array (*Required*): The array contains a list of relevant registers to read from.
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- **name** (*Required*): Name of the sensor.
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- **slave** (*Required*): The number of the slave (Optional for tcp and upd Modbus).
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- **register** (*Required*): Register number.
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- **register_type** (*Optional*): Modbus register type (holding, input), default holding
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- **unit_of_measurement** (*Optional*): Unit to attach to value.
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- **count** (*Optional*): Number of registers to read.
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- **scale** (*Optional*): Scale factor (output = scale * value + offset), default 1
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- **offset** (*Optional*): Final offset (output = scale * value + offset), default 0
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- **precision** (*Optional*): Number of valid decimals, default 0
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- **data_type** (*Optional*): Response representation (int, float). If float selected, value will be converted to IEEE 754 floating point format. default int
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It's possible to change the default 30 seconds scan interval for the sensor updates as shown in the [Platform options](/docs/configuration/platform_options/#scan-interval) documentation.
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### {% linkable_title Full example %}
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Example a temperature sensor with a 10 seconds scan interval:
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```yaml
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sensor:
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- platform: modbus
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scan_interval: 10
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registers:
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- name: Room_1
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slave: 10
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register: 0
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register_type: holding
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update_interval: 2.5
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unit_of_measurement: °C
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count: 1
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scale: 0.1
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offset: 0
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precision: 1
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data_type: int
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```
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