# Station Control

A valid test station can be

* started
* stopped
* terminated
* aborted

A test station is valid if it has a completely configured [test order](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f11testconfiguration.md).

You can choose to start the currently selected test station (F1) or all valid test stations at once (F7).

You can issue a **stop request** for the currently selected test station (F1) or all running test stations at once (F8).

{% hint style="info" %}
By issuing a **stop request**, it depends on the TestStand sequence file if, when and how the test actually stops. This is determined by the use of the [Check For Stop](/ltt/documentation/ltt-gui-manual/teststand/customsteptypes/checkstop.md) step inside of your TestStand sequence file. See [stop conditions](/ltt/documentation/ltt-gui-manual/teststand/processmodel/orderofexecution.md#STOP_CONDITIONS) for more informations.
{% endhint %}

It may happen, that a test station refuses to stop. This can have several reasons:

* no proper usage of the [Check For Stop](/ltt/documentation/ltt-gui-manual/teststand/customsteptypes/checkstop.md) step (infinite loop)
* a blocking call to an external code module (LabView, .NET)
* long time to reach the next [Check For Stop](/ltt/documentation/ltt-gui-manual/teststand/customsteptypes/checkstop.md) step

In such cases you can **terminate** a test station (Shift+F9). A termination request will end the execution of the selected test station, no matter where the execution currently is and whether a [Check For Stop](/ltt/documentation/ltt-gui-manual/teststand/customsteptypes/checkstop.md) step is used or not!

{% hint style="info" %}
Terminating test stations still perform all cleanup steps defined in the TestStand sequence file.
{% endhint %}

The termination will **not work** however if the test station execution has a (infinite?) **blocking call** to an external code module. If that is the case you can press Shift+F9 again. This will change the termination request to an abort request.

{% hint style="warning" %}
Aborting test stations **do not** perform any cleanup steps defined in the TestStand sequence file. This may lead to leaving the system in a dangerous state, possibly causing harm to the device under test!
{% endhint %}


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