Modbus


Modbus 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.

To add modbus to your installation, add the following to your configuration.yaml file:

For a network connection:

# Example configuration.yaml entry for a TCP connection
modbus:
  type: tcp
  host: IP_ADDRESS
  port: 2020

Configuration variables:

  • type (Required): Type of the connection to Modbus.
  • host (Required): The IP address of your Modbus device, eg. 192.168.1.1.
  • port (Required): The port for the communication.

For a serial connection:

# Example configuration.yaml entry for a serial connection
modbus:
  type: serial
  method: rtu
  port: /dev/ttyUSB0
  baudrate: 9600
  stopbits: 1
  bytesize: 8
  parity: N

Configuration variables:

  • type (Required): Type of the connection to Modebus.
  • method (Required): Method of the connection to Modbus.
  • port (Required): The port where your Modbus device is connected to your Home Assistant host.
  • baudrate (Required): The speed for the serial connection.
  • stopbits (Required): The stopbits for the serial connection.
  • bytesize (Required): The bytesize for the serial connection.
  • parity (Required): The parity for the serial connection.

Services

Service Description
write_register Write register. Requires unit, address and value fields. value can be either single value or an array

Building on top of Modbus