> For the complete documentation index, see [llms.txt](https://docs.irs.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.irs.systems/ltt/documentation/ltt-gui-manual/lttgui/hwcontrol/tcc-control-gui.md).

# TCC Control GUI

You can access the temperature chamber contact control panel through the main window menu **Hardware > TCC**.

![HW\_TCC\_Control](/files/vgJDb7w7CEdfCH770WvT)

With [simulated TCC driver](/ltt/documentation/ltt-gui-manual/configuration/moduleconfiguration/tcc.md) you can set a TCC value, otherwise the panel is read only.

***

The temperature chamber contact is a digital input for the LTT.

The input is usually set from the climatic chamber, which usually accompanies each LTT.

The TCC consists of **8 input channels** (bits).

You need the TCC input for determining which [operation mode](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration.md) of your [testplan](/ltt/documentation/ltt-gui-manual/teststand/operationmodes.md) should execute.

{% hint style="info" %}
The standard TCC module is a NI PCI-6503 24 channel digital in/out card. The 24 channels are grouped by 3 ports á 8 lines.
{% endhint %}


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