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ESPHome - Smart Home Made Simple

Systa Bus Component

The systa_bus Component provides status reading connectivity to solar heat energy collector controllers using the Systa Bus protocol.

Supported Models

Section titled “Supported Models”

The following table shows the currently supported models of SystaSolar devices.

Supported Models

Section titled “Supported Models”
NameConfig Value
PARADIGMA SystaSolar Aquasystasolar_aqua

The Config Value should be used for the model parameter in your sensor and text_sensor entries.

Hardware Connection

Section titled “Hardware Connection”

The device must be connected via a UART bus supporting the receiving line only. The UART bus must be configured at 9600bps. The controller outputs data depending on the packet type up to multiple times per second.

To convert the signal on the bus to UART that can be received by the ESPHome device, a converter circuit is needed. This circuit must apply a lowpass filter to the signal and convert the voltage to a safe level for the ESPHome device.

The following circuit uses simple components and provides electrical isolation between the bus and the ESP.

Systa Bus converter circuit

Simulation of this circuit

An alternative circuit design can be found here.

Component

Section titled “Component”
# Example configuration entry
systa_bus:
  uart_id: systa_uart

WARNING

If you are using the Logger make sure you are not using the same pins for it or otherwise disable the UART logging with the baud_rate: 0 option.

Configuration variables

Section titled “Configuration variables”
  • uart_id (Optional, ID): Manually specify the ID of the UART hub used to connect to the device.

NOTE

Functionality of the sensors depends on the type of the device and the scheme arrangement of the hydraulic system it controls. The actual arrangement number set up can be determined from the settings of the device. Please check the user manual and assess your arrangement to determine the functionality of each sensor and name them accordingly.

Sensor

Section titled “Sensor”
# Example configuration entry
sensor:
  - platform: systa_bus
    model: systasolar_aqua
    temperature_tsa:
      name: Temperature TSA
    temperature_tse:
      name: Temperature TSE
    temperature_twu:
      name: Temperature TWU
    temperature_tw2:
      name: Temperature TW2
    pump_speed:
      name: Pump Speed

Configuration variables

Section titled “Configuration variables”
  • model (Required): Specify the model of the connected controller. Choose one of the config values listed in the table of supported models above.

Supported sensors:

  • for systasolar_aqua: temperature_tsa, temperature_tse, temperature_twu, temperature_tw2, pump_speed.

All sensors are Optional and support all other options from Sensor.

NOTE

Sensors are updated every time a data packet is sent by the device. Some models send data very often, possibly every second. If you are concerned about the load on the receiving database, you can add a throttle filter to the sensors.

Text Sensor

Section titled “Text Sensor”
# Example configuration entry
text_sensor:
  - platform: systa_bus
    model: systasolar_aqua
    error_code:
      name: Error Code

Configuration variables

Section titled “Configuration variables”
  • model (Required): Specify the model of the connected controller. Choose one of the config values listed in the table of supported models above.

Supported text sensors:

  • systasolar_aqua: error_code.

All text sensors are Optional and support all other options from Text Sensor.

See Also

Section titled “See Also”