esphome-docs/components/select/modbus_controller.rst

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Modbus Controller Select
========================
.. seo::
:description: Instructions for setting up Modbus Controller Select(s) with ESPHome.
The ``modbus_controller`` Select platform allows you to create a Select from modbus
registers.
.. code-block:: yaml
# Example configuration entry
select:
- platform: modbus_controller
name: "Modbus Select Register 1000"
address: 1000
value_type: U_WORD
optionsmap:
"Zero": 0
"One": 1
"Two": 2
"Three": 3
Configuration variables:
------------------------
- **name** (**Required**, string): The name of the Select.
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- **address** (**Required**, int): The start address of the first or only register
of the Select.
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- **optionsmap** (**Required**, Map[str, int]): Provide a mapping from options (str) of
this Select to values (int) of the modbus register and vice versa. All options and
all values have to be unique.
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- **value_type** (*Optional*): The datatype of the modbus data. Defaults to ``U_WORD``.
- ``U_WORD`` (unsigned 16 bit integer from 1 register = 16bit)
- ``S_WORD`` (signed 16 bit integer from 1 register = 16bit)
- ``U_DWORD`` (unsigned 32 bit integer from 2 registers = 32bit)
- ``S_DWORD`` (signed 32 bit integer from 2 registers = 32bit)
- ``U_DWORD_R`` (unsigned 32 bit integer from 2 registers low word first)
- ``S_DWORD_R`` (signed 32 bit integer from 2 registers low word first)
- ``U_QWORD`` (unsigned 64 bit integer from 4 registers = 64bit)
- ``S_QWORD`` (unsigned 64 bit integer from 4 registers = 64bit)
- ``U_QWORD_R`` (unsigned 64 bit integer from 4 registers low word first)
- ``U_QWORD_R`` (signed 64 bit integer from 4 registers low word first)
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- **register_count** (*Optional*): The number of registers which are used for this Select. Only
required for uncommon response encodings or to
:ref:`optimize modbus communications<modbus_register_count>`. Overrides the defaults determined
by ``value_type``.
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- **skip_updates** (*Optional*, int): By default all sensors 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. Defaults to ``0``.
Note: The modbus_controller merges several registers into groups which are updated together. For
each group the smallest update cycle is used.
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- **force_new_range** (*Optional*, boolean): If possible sensors with sequential addresses are
grouped together and requested in one range. Setting this to ``true`` enforces the start of a new
range at that address.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
- **lambda** (*Optional*, :ref:`lambda <config-lambda>`): Lambda to be evaluated every update interval
to get the current option of the select.
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Parameters passed into lambda
- **x** (``int64_t``): The parsed integer value of the modbus data.
- **data** (``const std::vector<uint8_t>&``): vector containing the complete raw modbus response bytes for this
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.
- **item** (``ModbusSelect*const``): The sensor object itself.
Possible return values for the lambda:
- ``return <std::string>;`` The new option for this Select.
- ``return {};`` Use default mapping (see ``optionsmap``).
- **write_lambda** (*Optional*, :ref:`lambda <config-lambda>`): Lambda to be evaluated on every update
of the Sensor, before the new value is written to the modbus registers.
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- **use_write_multiple** (*Optional*, boolean): By default the modbus command ``Preset Single Registers``
(function code 6) is used for setting the holding register if only 1 register is set. If your device only supports *Preset Multiple Registers* (function code 16) set this option to ``true``. Defaults
to ``false``.
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- **optimistic** (*Optional*, boolean): Whether to operate in optimistic mode - when in this mode,
any command sent to the Modbus Select will immediately update the reported state. Defaults
to ``false``.
- All other options from :ref:`Select <config-select>`.
.. code-block:: yaml
# example
lambda: |-
ESP_LOGD("Reg1000", "Received value %lld", x);
ESP_LOGD("Reg1000", "Parsed from bytes 0x%x;0x%x", data[item->offset], data[item->offset + 1]);
if (x > 3) {
return std::string("Three");
}
Parameters passed into ``write_lambda``
---------------------------------------
- **x** (``const std::string&``): The option value to set for this Select.
- **value** (``int64_t``): The mapping value of ``x`` using ``optionsmap``.
- **payload** (``std::vector<uint16_t>& payload``): Empty vector for the payload. The lamdba can add
16 bit raw modbus register words which are send to the modbus device.
- **item** (``ModbusSelect*const``): The sensor object itself.
Possible return values for the lambda:
- ``return <int64_t>;`` the value which should be written to the configured modbus registers. If there were data written to ``payload`` this value is ignored.
- ``return {};`` Skip updating the register.
.. code-block:: yaml
# example
write_lambda: |-
ESP_LOGD("Reg1000", "Set option to %s (%lld)", x.c_str(), value);
// re-use default option value from optionsmap
if (value == 0) {
return value;
}
// return own option value
if (x == "One") {
return 2;
}
// write payload
if (x == "Two") {
payload.push_back(0x0001);
return 0; // any value will do
}
// ignore update
return {};
See Also
--------
- :doc:`/components/modbus_controller`
- :doc:`/components/sensor/modbus_controller`
- :doc:`/components/binary_sensor/modbus_controller`
- :doc:`/components/switch/modbus_controller`
- :doc:`/components/text_sensor/modbus_controller`
- :doc:`/components/output/modbus_controller`
- :ref:`automation`
- https://www.modbustools.com/modbus.html
- :ghedit:`Edit`