# 3.1 | Connecting to the COMMAND ECU

To access **COMMAND** ECU settings from the Apply View, press "**More**" at the right side of the screen, then "**COMMAND Settings**". The **COMMAND** Settings Overview page shows each page related to operation of the ECU.

[![image.png](https://docs.t3rra.com/uploads/images/gallery/2026-06/scaled-1680-/g27FGWJNmYrKbHvw-image.png)](https://docs.t3rra.com/uploads/images/gallery/2026-06/g27FGWJNmYrKbHvw-image.png)

[![image.png](https://docs.t3rra.com/uploads/images/gallery/2026-06/scaled-1680-/03CB99Al5W1o0J8a-image.png)](https://docs.t3rra.com/uploads/images/gallery/2026-06/03CB99Al5W1o0J8a-image.png)

The Machine page is used to setup the connection between **Level COMMAND** software and the **COMMAND** ECU in addition to selecting the machine profile being used. To get to this page, first go to the [COMMAND Settings](https://docs.t3rra.com/books/level-command-manual/page/42-command-settings "COMMAND Settings") page and click the top left '**Machine**' button.

## ECU Serial Connection

Begin by connecting to the **COMMAND** ECU using the Comms tab. Select the correct COM port from the list OR

Click the '**Scan ports**' button to search for **COMMAND** data among all serial ports present. If the ECU is detected successfully, click **Connect**.

[![image.png](https://docs.t3rra.com/uploads/images/gallery/2026-06/scaled-1680-/oGLJZLHAskrlmwmK-image.png)](https://docs.t3rra.com/uploads/images/gallery/2026-06/oGLJZLHAskrlmwmK-image.png)

[![image.png](https://docs.t3rra.com/uploads/images/gallery/2026-06/scaled-1680-/Eb7HzScGp74NNSUE-image.png)](https://docs.t3rra.com/uploads/images/gallery/2026-06/Eb7HzScGp74NNSUE-image.png)

#### Connection Failure

If **Level COMMAND** fails to connect to the ECU over the chosen COM port, a warning will be displayed. Verify power and communication connections before retrying.

#### [![image.png](https://docs.t3rra.com/uploads/images/gallery/2026-06/scaled-1680-/0wHuwBXrXc3LFO9q-image.png)](https://docs.t3rra.com/uploads/images/gallery/2026-06/0wHuwBXrXc3LFO9q-image.png)

#### Successful Connection

Once connected to the ECU successfully, **Level COMMAND** will:

- Establish communication with the ECU
- Read stored parameters
- Load the current machine configuration

#### [![image.png](https://docs.t3rra.com/uploads/images/gallery/2026-06/scaled-1680-/BZPfuRXvvUxyRyPo-image.png)](https://docs.t3rra.com/uploads/images/gallery/2026-06/BZPfuRXvvUxyRyPo-image.png)

Once connected, Continue to **3.2 | Selecting A Machine Profile**.