UniFi Access - Access Control Hub Input & Output Terminals
Inputs
The input terminals on an Access Control Hub manage communication between devices such as a motion sensor, push-to-exit device, door position sensor, and fire panel. The inputs receive data or signals and take corresponding actions. Door Hub (UA-Hub-Door) is used as an example here.
| Input Terminal Name | Description |
| MOTION | Connect to a motion sensor to unlock a door. |
| BUTTON |
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| DOOR POSITION | Connect to a door position sensor (DPS) to detect a door's open/closed status. |
| EMERGENCY | Connect to emergency equipment such as a fire panel to trigger global or local emergency mode during emergencies. |
The inputs for different types of Access Control Hubs differ. To learn more, see the installation guide for Access Hub (UA-Hub), Enterprise Access Hub (EAH-8), Elevator Hub (UA-Hub-Elevator), and Gate Hub (UA-Hub-Door).
Outputs
The control of the output terminals on an Access Control Hub is based on the inputs.
Example 1: Pressing the push-to-exit button unlocks the door lock, and the door operator opens it.
Example 2: Pressing the request-to-entry doorbell button rings a chime and notifies admins via the UniFi Access mobile app.
Example 3: The door position sensor detecting an unauthorized door opening triggers an alarm and updates the UniFi Access interface to display "Unauthorized Opening."
Lock
LOCK relay terminals are used for connecting to door locks.
| Category | Relay Terminal Name | Description |
| LOCK | POWERED | Designed for locks operating at 12V up to 1 Amp. |
| NO POWER (DRY) | Intended for electric locks that do not operate at a 12V rating, such as a 24V electric strike. An external transformer is required to work with the DRY relay terminals. |
- All Access Control Hubs have built-in 12V power relays, eliminating the need for an external transformer and improving performance.
- The choice between POWERED (12V / 1A) and NO POWER (DRY) relay terminals depends on the specific requirements of the connected device.
- Important Reminder: Do not use AC locks. Locks specifying 12VAC, 1 Amp are incompatible with the required DC power.
Installation Reminders
Reminder 1: When a double door magnetic lock requires more power, using a 12V supply may result in a current draw exceeding 1 Amp. To reduce the current and meet the required specifications, you can use a dry relay and an external 24V power source for the lock.
Reminder 2: The POWERED relay terminal supplies 12V and cannot be supplemented with external power. Adding an external 12V power source alongside the relay's 12V will damage the hub.
Reminder 3: The DRY relay terminal is rated at 30VDC, 1 Amp. Ensure any external devices powered by external sources do not exceed this rating to avoid damaging the relay.
AUX
AUX means "auxiliary" and the relay terminals are used for connecting to auxiliary devices.
| Category | Relay Terminal Name | Description |
| AUX | DOOR OPERATOR | Designed for door operators that require only a dry output signal for activation. |
| SIREN/CHIME | Designed for a 2-wire siren or chime that operates on 12V with a rating of no more than 0.33A (4 watts). |
Installation Reminders
Reminder 1: Some legacy auxiliary accessories may require low voltage AC current (12/24 VAC), which is unsuitable for Access Control Hubs, even with an external transformer. Do not use AC-rated devices.
Reminder 2: The SIREN/CHIME relay terminal supplies 12V and cannot be supplemented with external power. Adding an external 12V power source alongside the relay's 12V will damage the hub.
NO, NC, & COM
NC (Normally Closed), NO (Normally Open), and COM (common) are the three output relay terminals. Usually, a device is connected to the COM terminal and either one of the NC and NO terminals.
These relay terminals act like an electrically operated switch, similar to a light switch.
- When a relay is closed, it completes the circuit, allowing electric current to flow.
- When a relay is open, it interrupts the circuit, halting the flow of electric current.
| When Connected to NO and COM | When Connected to NC and COM | |
| Normal Rest State |
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| Trigger State |
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Common Device Outputs
The output type (NO/COM or NC/COM) for the following devices depends on the device itself. See the table below for common outputs based on experience.
| Device | NO/NC/COM Connection on Access Control Hub |
| Fail-safe electric lock | Usually connected to the NC/COM of the LOCK terminal. |
| Fail-secure electric lock | Usually connected to the NO/COM on the LOCK terminal. |
| Door operator | Usually connected to the NO/COM on the AUX Door Opener (Dry) terminal. |
| Door position sensor (DPS) | They mostly act as the NC-type output.* |
| Doorbell button | They mostly act as the NO-type output.* |
| Push-to-exit button | They mostly come with the selection of the NO/NC type.* |
| Motion sensor | They mostly come with the selection of the NO/NC type.* |
| Fire panel | They mostly come with the selection of the NO/NC type.* |
* Device setting adjustments may be required on the UniFi Access application. For example, to ensure proper function, set the trigger level of a DPS to High Active (NC) in Access application > Devices > select a Hub > Settings > DOOR POSITION.