> For the complete documentation index, see [llms.txt](https://docs.accessia.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.accessia.com/hardware/ai-security-hub-hub-v1/inputs-and-outputs/auxiliary-io.md).

# Auxiliary IO

* The Hub includes four auxiliary inputs, **AUX 1 IN,** **AUX 2 IN, AUX 3 IN, AUX 4 IN**, and three auxiliary outputs **AUX 1 OUT,** **AUX 2 OUT,** and **AUX 3 OUT**. Use Accessia Installer app to configure their function

{% hint style="info" %}
If you want to connect an intruder alarm interface, use **AUX 3 IN, AUX 4 IN,** and **AUX 3 OUT**. See how to connect an [intruder alarm interface](/hardware/ai-security-hub-hub-v1/inputs-and-outputs/intruder-alarm-interface.md)
{% endhint %}

* The inputs can only be connected to isolated switch (or relay) contacts. Do not connect them to a power supply. A loop resistance greater than 500 kOhms will be interpreted as Open and a loop resistance less than 500 Ohms will be interpreted as Closed
* Use a shielded cable and connect the shield to earth using the labeled earth post inside the enclosure
* The outputs are implemented using a single-pole-double-throw relay and are electrically isolated from the rest of the system (and each other). The dry output is rated to switch a maximum of 5A and 30 VDC