:description:Instructions for setting up a modbus_controller device sensor.
The ``modbus_controller`` platform creates a Number from a modbus_controller.
When the Number is updated a modbus write command is created sent to the device.
Configuration variables:
------------------------
-**id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
-**name** (**Required**, string): The name of the sensor.
- coil: coils are also called discrete outout. Coils are 1-bit registers (on/off values) that are used to control discrete outputs. Read and Write access
- discrete_input: discrete input register (read only coil) are similar to coils but can only be read.
- holding: Holding Registers - Holding registers are the most universal 16-bit register. Read and Write access
- read: Read Input Registers - registers are 16-bit registers used for input, and may only be read
-**address**: (**Required**, int): start address of the first register in a range
-**value_type**: (**Required**): datatype of the mod_bus register data. The default data type for modbus is a 16 bit integer in big endian format (MSB first)
-**skip_updates**: (*Optional*, integer): By default all sensors of of a modbus_controller are updated together. For data points that don't change very frequently updates can be skipped. A value of 5 would only update this sensor range in every 5th update cycle
Note: The modbus_controller groups component by address ranges to reduce number of transactions. All compoents with the same address will be updated in one request. skip_updates applies for all components in the same range.
-**register_count**: (*Optional*): only required for uncommon response encodings
The number of registers this data point spans. Overrides the defaults determined by ``value_type``.
-**force_new_range**: (*Optional*, boolean): If possible sensors with sequential addresses are grouped together and requested in one range. Setting ``force_new_range: true`` enforces the start of a new range at that address.
-**offset**: (*Optional*, int): only required for uncommon response encodings
offset from start address in bytes. If more than one register is read a modbus read registers command this value is used to find the start of this datapoint relative to start address. The component calculates the size of the range based on offset and size of the value type
-**min_value** (*Optional*, float): The minimum value this number can be.
-**max_value** (*Optional*, float): The maximum value this number can be.
-**step** (*Optional*, float): The granularity with which the number can be set. Defaults to 1
-**custom_data** (*Optional*, list of bytes): raw bytes for modbus command. This allows using non-standard commands. If ``custom_data`` is used ``address`` and ``register_type`` can't be used.
custom data must contain all required bytes including the modbus device address. The crc is automatically calculated and appended to the command.
See :ref:`modbus_custom_data` how to use ``custom_command``
note: because the response contains data for all registers in the same range you have to use ``data[item->offset]`` to get the first response byte for your sensor.
note: because the response contains data for all registers in the same range you have to use ``data[item->offset]`` to get the first response byte for your sensor.