---
title: "Hardware connection"
canonical: "https://docs.cuesystem.com/space/TOSASG/273154590/Hardware%20connection"
format: markdown
---
PIR motion detectors with dry contacts are manufactured with two different idle states:

- Detectors primarily intended for **security devices** have an idle contact state closed and are opened when motion is detected.
- Detectors designed primarily for **lighting switching** have the idle contact state open and they close when motion is detected.

|  | Normally closed  
(typical for alarm sensors) | Normally open  
(typical for light sensor) |
| --- | --- | --- |
|  | ![image](media://d8ef5ffd-18f6-42f2-b23a-4e908816ee35) | ![image](media://7056b167-f368-41de-9a31-b0d1bb261b05) |
| Idle resistance | 0 | ∞ |
| Detected motion resistance | ∞ | 0 |
| Active state | Open | Close |
| Description | The idle state is defined as a loop resistance. If this value changes, it is regarded as detector triggering. | The idle state is defined as a open loop (resistance ∞). If this value changes, it is regarded as detector triggering. |
| Note | Use alarm contact on PIR detector. Do not use tamper contact. | The output contacts and the versatile port must be galvanically isolated from AC power supply 230 V (110 V). |

## Controller power supply

#### Local power supply

For connection to a network without PoE infrastructure, the local power supply can be used. It means that local power is independent of the central power source. It can increase the reliability of distributed systems because local functions are independent of the central power supply.

There are two possibilities for local power supply:

- Power supply 24 VDC
- PoE Adapter

#### PoE infrastructure

The integrated PoE permits easy installation in areas where PoE network infrastructure is installed. It means the controller power supply depends on the central PoE power supply. It can decrease the reliability of the distributed systems because local functions depend on the central power supply.