> For the complete documentation index, see [llms.txt](https://docs.voltmasters.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voltmasters.io/dso-rtu/commissioning-and-certification.md).

# Commissioning & certification

A DSO RTU installation is only complete once the link has been **validated** and **certified**. Voltmasters validates the operation at commissioning and assists remotely during the grid operator's official inspection (the *certification* / conformity test).

### Voltmasters validates the operation at commissioning

When the installation is put into service, Voltmasters verifies the complete DSO RTU chain, not just that the link is up, but that the installation actually responds correctly to every control. We check:

* **The RTU connection**: the grid operator's RTU reaches the controller and the link is stable. See [RTU connection](/dso-rtu/rtu-connection.md).
* **Data exchange**: every control and measurement data point is present and correctly mapped (limits, modes, emergency stops, reason codes, per-category measurements).
* **Active-power limits**: that injection and consumption are actually capped to the commanded values, at the connection point and per asset.
* **Reactive-power control**: that local/remote Q mode and the Q band behave as expected.
* **Emergency stops**: both the **software** stop and, where installed, the **hardware** stop via the [IO module](/dso-rtu/io-module-emergency-stop.md).
* **Feedback**: that the EMS mirrors the right state back and reports measurements per category.

{% hint style="info" icon="lightbulb" %}
Validation is done against real measurements: we confirm the installation's actual injection/consumption follows each command, not just that the command was received.
{% endhint %}

### Remote support during certification

The grid operator performs an official **certification** (conformity test) of the DSO RTU installation before it is approved for normal operation. Voltmasters **assists with this certification remotely**:

* Our team monitors the link and the installation **live** during the inspection.
* We observe the grid operator's **test commands** as they arrive and confirm the installation responds correctly.
* We can **diagnose and resolve issues in real time**, so the certification can be completed in a single session wherever possible.
* We provide the technical confirmation the grid operator needs about the EMS side of the interface.

#### Test mode

During certification the grid operator uses the **test** reason code. Commands sent with the test reason are handled by the EMS exactly like normal commands, but they are clearly identifiable as part of the inspection. This lets the grid operator exercise limits and emergency stops in a controlled way during the test session.

### What to prepare

Before certification can take place, make sure:

* [ ] The RTU is installed and the [network link](/dso-rtu/rtu-connection.md) to the controller is in place.
* [ ] The contractual grid limits (max injection / consumption) are configured in the project.
* [ ] All assets are added, verified and controllable in the EMS.
* [ ] If a hardware emergency stop is required, the [IO module](/dso-rtu/io-module-emergency-stop.md) is installed, wired and configured.
* [ ] A certification date is agreed with the grid operator and shared with Voltmasters so we can plan remote assistance.

### After certification

Once the grid operator approves the certification, the installation is cleared for normal DSO RTU operation. From that point:

* DSO RTU runs continuously and autonomously.
* The link and the installation's compliance are **monitored**; any loss of connection or inability to execute a command is surfaced as an [incident](/voltmasters-platform/9.-incident-management.md).
* Configuration changes (limits, asset changes, emergency-stop wiring) should be revalidated and, if required by the grid operator, re-certified.


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