Datanodes

Datanode Represents a virtual device that provides data from various physical devices or external services. It contains one or more signals, variables, or values used by the Mervis SCADA system.
Datahub Manages your datanode and handles its communication and data storage.

The datanode type determines how data is acquired:

  • IoT LoRa types (e.g., uh30, prolora, elliot…) – receive data from ČRA and usually correspond to a specific physical device such as an electricity or water meter.
  • HTTP types (e.g., gasnet, spotrebapodpalcem, distribuce24…) – actively retrieve data from external APIs. These don’t always correspond to a single device – data may be aggregated, processed by a service, or a single datanode may serve hundreds of physical devices.

In the user interface, you can configure basic parameters and type-specific properties of the datanode. It is also possible to assign a datanode to a datahub, especially if multiple datahubs are available in the domain.

Datahub Manages your datanode and handles its communication and data storage.

Main actions:

  • Edit Datanode – allows you to modify the parameters of an existing datanode
  • Delete Datanode – allows you to delete the selected datanode

Buttons:

  • Create Datanode – opens a modal window for creating a new datanode
  • Datanode Variables – opens a modal window displaying the datanode’s variables
  • Datanode Events – opens a modal window displaying the datanode’s events

Modal window for creating a new datanode

In this window, you can set the datanode parameters:

  • Name – the name of the datanode
  • Datahub – select the datahub. If there is only one available in the domain, this field is hidden. Otherwise, select the one that matches the datanode's configuration and type.
  • Database profile – the datanode’s database profile
  • Type – the type of datanode, which determines which properties are configurable
  • Datanode type properties – properties specific to the selected datanode type.

If a row is highlighted in red, it is a required field and must be filled in.

  If not highlighted, the property is optional and may remain empty.  
  Some fields may have default values pre-filled.

Modal window showing a list of available datanode variables and their most recent known value in the Mervis system, along with a timestamp.

Modal window displaying the events of the datanode. This shows the current status of the given datanode and is useful for diagnosing datanode errors.

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