Metrici Horn Light

User Manual for End Users and System Administrators

Brightness

Shadow

Speed

Drag to rotate • Scroll to zoom • Right-click to move

Welcome! This guide covers everything you need to set up and operate the Metrici Horn Light. This device has a built-in red indicator light and an audible horn that activate simultaneously when a trigger event is received — providing both a visual and an audio alert. Whether you are setting up an alert at a parking entrance, an access control point, or a security checkpoint, this manual provides clear, step-by-step instructions.

Introduction
First Boot
Dashboard
Settings
User Management
Troubleshooting

1. Introduction

The Metrici Horn Light is a hardware product developed by Metrici. It is a compact LAN device with a built-in red indicator light and an audible horn — used to deliver simultaneous visual and audio alerts at parking entrances, access control points, or any location where an immediate go/stop signal is needed.

The device features a single Ethernet port that provides both network connectivity and electrical power via PoE (Power over Ethernet). No separate power adapter is needed — a single cable handles everything.

The red light and horn are controlled via two independent relay outputs built into the controller. When a Metrici detection engine (such as Area Counter or Line Counter) needs to signal an event, it sends an HTTP command to the Horn Light device, which activates the corresponding relay. For example, when a parking zone is full, the engine can trigger Relay 1 to turn the red light on and Relay 2 to sound the horn — alerting users that no space is available.

The controller is also managed through a web-based interface accessible from any browser on the same network. From this interface, you can manually activate the light and horn, set automatic timers, configure the network connection, manage user credentials, and perform firmware updates.

Key features:

Red indicator light + horn — activate simultaneously on trigger for combined visual and audio alerts
Two independent relay outputs — Relay 1 (red light) and Relay 2 (horn) with individually configurable timers
Two input addresses — configure IP:port pairs to receive trigger signals from external systems
Wiegand integration — connect to a Wiegand server for access control scenarios
Automatic timers — set how long each output stays active before automatically switching off
PoE powered — single Ethernet cable for both power and network
Web interface — configure and monitor from any browser
WiFi and Ethernet — supports both connection types
Remote control via HTTP — outputs are controlled by Metrici detection engines (Area Counter, Line Counter, etc.) through simple HTTP commands

Technical Data

Specification	Details
Description	Red light + horn alert LAN controller with built-in relay outputs
Outputs	Relay 1 (red indicator light), Relay 2 (horn/buzzer)
Inputs	2 configurable input addresses (IP:port)
Connectivity	1 Ethernet port (PoE)
Networking	WiFi 802.11 b/g/n and Ethernet 10/100 Mbps
Protocols	HTTP over TCP/IP, Wiegand
Power	PoE (IEEE 802.3af) via Ethernet cable — no separate power adapter needed
Operating Temperature	-20 to +50 °C, IP65
Software Compatibility	Metrici v3.3 and higher
Interface	Web-based dashboard with 3 sections: Dashboard, Settings, User

Dimensions

2. First Boot

The Metrici Horn Light is powered via PoE (Power over Ethernet). Connect a single Ethernet cable from a PoE switch or PoE injector to the device's Ethernet port. This cable provides both network connectivity and electrical power — no separate power adapter is needed.

Note: The network switch or injector must support at least standard PoE (IEEE 802.3af). Verify your equipment supports PoE before connecting.

Important! The default IP address of the Horn Light device is always 192.168.100.10.

After connecting the Ethernet cable, open a browser on a computer or phone connected to the same network and navigate to:

http://192.168.100.10

Note: The computer or phone used to access the dashboard must be connected to the same network (router) as the Horn Light device. If they are on different networks, the browser will not be able to reach the device.

The device ships with factory defaults: Connection Type: Ethernet and IP Type: Static. This is why you can connect to it immediately at the default address using an Ethernet cable.

The web interface has three main sections:

Dashboard — displays the current status of the device, network information, relay states, and logs
Settings — where all configuration changes are made (network, I/O timers, Wiegand, backup, firmware)
User — where a user account is created or edited for securing access to the interface

3. Dashboard

The Dashboard is the first page you see after accessing the device. It provides a real-time overview of the Horn Light device's current state — see Fig.1 Dashboard.

Network Status

The left side of the Dashboard displays the current network configuration, including:

Connected — whether the device is connected to the network (Yes/No)
Connection Type — Ethernet or WiFi
IP Type — Static or DHCP
SSID — the WiFi network name (empty when using Ethernet)
IP Address — the device's current IP address
Gateway — the router's IP address
Subnet Mask — the network mask
DNS — the DNS server address
MAC Address WiFi — the device's WiFi MAC address
MAC Address Eth — the device's Ethernet MAC address

Output Controls

The right side of the Dashboard shows the I/O Settings panel. Switch to the Output tab to view and manually control the device's relay outputs — see Fig.2 Dashboard Output Tab.

The Output tab provides:

Timer 1 — displays the current timer value (in seconds) configured for Relay 1 (red light)
Timer 2 — displays the current timer value (in seconds) configured for Relay 2 (horn)
Relay 1 — On / Off — manual toggle to activate or deactivate the red indicator light
Relay 2 — On / Off — manual toggle to activate or deactivate the horn

The On/Off buttons allow you to manually control each output directly from the Dashboard for testing or manual operation. When a button is active (relay is on), the On button is highlighted. When inactive, the Off button is highlighted in red. Under normal triggered operation both relays activate at the same time — the red light turns on and the horn sounds simultaneously.

Note: The Input tab of the I/O Settings shows the two configured input addresses (Input 1 Address and Input 2 Address) — the IP:port pairs from which the device accepts trigger commands. If not configured, they display as "not set".

Logs

The Logs section at the bottom of the Dashboard displays a timestamped record of recent device events, including network configuration details and relay state changes. For example:

Relay 1 is ON — the red light was activated
Relay 1 is OFF — the red light was deactivated
Relay 2 is ON — the horn was activated
Relay 2 is OFF — the horn was deactivated

Logs are useful for troubleshooting and verifying that commands are being received and executed correctly.

4. Settings

To configure the Horn Light device, click Settings in the left-side menu — see Fig.3 Settings. Here you can change the network configuration, set relay timers, configure input and Wiegand addresses, perform backup and restore operations, and update the firmware.

4.1 Network Settings

The Network Settings section allows you to configure how the device connects to your local network.

Connection Type

Option	Description
Ethernet	Connect via Ethernet cable (recommended). SSID and Password fields become inactive and display "Ethernet Connection".
WiFi	Connect via WiFi. Enter the SSID and Password of your local wireless network.

IP Type

Option	Description
Static	Manually set the IP Address, Gateway, Subnet Mask, and DNS. Recommended for permanent installations so the device always has the same address.
DHCP	The device receives an IP address automatically from the router. All address fields become inactive.

Network Fields

Field	Description
SSID	The WiFi network name. Only used when Connection Type is WiFi.
Password	The WiFi network password. Only used when Connection Type is WiFi.
IP Address	The device's unique address on the network (e.g., 192.168.100.10).
Gateway	The router's IP address (e.g., 192.168.100.1).
Subnet Mask	Defines the local network range (e.g., 255.255.255.0).
DNS	The DNS server address (e.g., 8.8.8.8).

After making changes, click the Save button. The device will restart with the new network settings.

Attention! When saving any network settings, the device will restart and you will need to reconnect at the new IP address. If you chose DHCP, check your router's device list to find the assigned IP address.

Important! When using DHCP, each reboot may assign a different IP address to the device. To prevent this, configure your router to reserve a fixed IP for the Horn Light device's MAC address (visible on the Dashboard). This requires networking knowledge.

When any button or setting is active, it is displayed in red.

4.2 I/O Settings

The I/O Settings panel is divided into two tabs: Input and Output.

Input Tab

The Input tab allows you to configure the two input addresses from which the device accepts trigger signals. Each input requires an Address (IP) and a Port number.

Field	Description
Input 1 Address	IP address of the first system authorised to send trigger commands to this device.
Input 1 Port	Port number corresponding to Input 1.
Input 2 Address	IP address of the second system authorised to send trigger commands.
Input 2 Port	Port number corresponding to Input 2.

Click Save to apply the input address configuration. If no input addresses are configured, the fields display "not set".

Note: Even without configured input addresses, the device can be controlled manually from the Dashboard or via HTTP commands from any machine on the network (subject to user authentication settings).

Output Tab

On the Settings page, the Output tab allows you to configure the timer durations for each relay — see Fig.4 Output Settings.

Field	Description
Timer 1 (s)	The number of seconds Relay 1 (red light) stays ON after being triggered. Set to 0 to keep it ON indefinitely until a manual or remote command turns it OFF.
Timer 2 (s)	The number of seconds Relay 2 (horn) stays ON after being triggered. Set to 0 to keep it ON indefinitely until a manual or remote command turns it OFF.

After changing the timer values, click Save to apply.

Note: You can configure different durations for each relay independently. For example, the horn could sound for 5 seconds while the red light stays on for 30 seconds to provide a lasting visual indication after the alert.

Remote Control via HTTP Commands

The built-in relays are controlled remotely by Metrici detection engines using HTTP requests. When an engine detects an event (such as a zone becoming full or an object crossing a line), it sends an HTTP command to the Horn Light device, which activates the corresponding relay.

Command	URL
Turn Relay 1 (Red Light) ON	`http://192.168.100.10/relay1/on`
Turn Relay 1 (Red Light) OFF	`http://192.168.100.10/relay1/off`
Turn Relay 2 (Horn) ON	`http://192.168.100.10/relay2/on`
Turn Relay 2 (Horn) OFF	`http://192.168.100.10/relay2/off`

Replace 192.168.100.10 with the actual IP address of your Horn Light device.

Note: If a user and password are set on the device, the URLs must include authentication credentials. For example: http://username:password@192.168.100.10/relay1/on. See the User Management chapter for details.

If the timer is set to a value greater than 0, the relay will automatically turn OFF after the specified duration — only the "ON" URL is needed in the detection engine. If the timer is set to 0, both ON and OFF URLs should be configured.

Integration with Metrici Detection Engines

The Metrici Horn Light is designed to work with Metrici detection engines. The engine sends HTTP commands to the device's IP address to activate the relays. Below are examples showing how to configure this in the Metrici Control Panel for different engines.

Make sure the Area Counter or Line Counter engines are properly configured. You can find the documentations here:

Example — Area Counter

In the Metrici Control Panel, open the Area Counter engine settings. Under Engine Working Mode & External Trigger, enter the Horn Light device's IP in the signaling device fields:

Field	Value	Effect
Signaling device URL (ON)	`http://192.168.100.10/relay1/on`	Activates the red light when the configured condition is met (e.g., zone is full)
Signaling device URL (OFF)	`http://192.168.100.10/relay1/off`	Deactivates the red light when the condition clears

To also trigger the horn, add a second signaling URL pointing to /relay2/on and /relay2/off.

How it works: When the Area Counter detects that a zone has reached its capacity, it sends the ON signal to the Horn Light device, turning the red light on and sounding the horn. When the count drops below capacity, it sends the OFF signal. This gives users a clear combined visual and audio indication of whether a space or zone is available.

4.3 Wiegand Settings

The Wiegand Settings section allows you to connect the Horn Light to a Wiegand server — see Fig.5 Wiegand & Other Settings. This is used in access control scenarios where a Wiegand reader communicates with a central server and the Horn Light acts as the alert output.

Field	Description
Server Address	The IP address of the Wiegand server the device should communicate with.
Port	The port number used to connect to the Wiegand server.

Click Save to apply. If not used, both fields display "not set".

4.4 Backup / Restore / Reset

Backup Current Configuration

Click Save to File to download a JSON file containing all current settings. This file can be used to restore settings later or deploy the same configuration to another device.

Restore Configuration

Click Browse, select a previously saved configuration file, then click Upload. The device will restart with the imported settings.

Important! Importing a configuration file will overwrite all current settings.

Factory Reset

Two reset options are available under the Factory Reset tab:

Soft Reset — keeps the network settings (SSID, password, IP, gateway, subnet, DNS) but resets everything else (timers, input addresses, user credentials). The device restarts after the reset.
Factory Reset — resets all settings to factory defaults. After restart, the device will be accessible at the default IP address: 192.168.100.10.

Both options require confirmation before executing.

4.5 Firmware Update

Firmware files (firmware.bin and littlefs.bin) are provided by Metrici and can be downloaded from support.metrici.ro.

To update:

Download the firmware files from support.metrici.ro.
Click Browse and select firmware.bin.
Click Update.
After the firmware update completes, repeat the process for the optional littlefs.bin file.

Important! During the update, a blue "Updating..." message will appear. The controller will not be responsive — do not interact with the device. Wait until you are redirected to the confirmation page. The current configuration is preserved after the update.

5. User Management

The User page allows you to set a username and password for HTTP authentication — see Fig.6 User Settings. Only one user account can exist at a time — saving a new username or password will overwrite the previous one.

Setting a user is not mandatory for the device to work. It is a security feature that prevents unauthorized access to the web interface and HTTP commands from the local network.

Important! When a user and password are set, all HTTP commands must include the credentials. For example:
http://username:password@192.168.100.10/relay1/on

Note: Saving or changing user settings will restart the device. There can only be one user. Saving a new user name or password will replace the existing one.

6. Troubleshooting

Cannot access the web interface

Verify that the device is powered on — check that the PoE switch or injector is providing power through the Ethernet cable.
Make sure your computer or phone is on the same local network (same subnet) as the Horn Light device.
Try accessing the default IP address: http://192.168.100.10.
If you previously changed the IP or switched to DHCP, check your router's device list to find the current IP address.
If all else fails, perform a factory reset to restore the default IP.

Red light or horn does not activate

Go to the Dashboard > I/O Settings > Output tab and click On for Relay 1 or Relay 2 — verify the state changes and that the Logs section confirms the event.
Check the physical wiring between the device and the light / horn.
If using HTTP commands, verify the URL is correct and includes authentication credentials if a user is set.

Light or horn stays on and does not turn off automatically

Check the timer value in Settings > I/O Settings > Output. If set to 0, the relay stays active indefinitely until it receives an explicit OFF command.
Set the timer to a value greater than 0 (in seconds) if you want the output to turn off automatically after triggering.

HTTP commands not working

Verify the IP address in the URL matches the device's current IP (check the Dashboard).
If a user and password are set, make sure the URL includes credentials: http://user:pass@IP/relay1/on.
Make sure the device is reachable from the machine sending the command (same network, no firewall blocking).

Device not receiving power

Verify that your switch or injector supports PoE (IEEE 802.3af).
Try a different Ethernet cable — damaged cables can prevent PoE power delivery.
Try a different port on the PoE switch.
If using a PoE injector, make sure it is plugged in and powered on.

Wiegand server not connecting

Verify the Server Address and Port in Settings > Wiegand Settings are correct.
Ensure the Wiegand server is running and reachable from the Horn Light's network.
Check that no firewall is blocking the configured port.