# 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 --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.accessia.com/hardware/ai-security-hub-hub-v1/inputs-and-outputs/auxiliary-io.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.