Metrici Signal Light

Name: Metrici Signal Light
Brand: Metrici
Availability: InStock

User Manual for End Users and System Administrators

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Welcome! This guide covers everything you need to set up and operate the Metrici Signal Light variant. This device has two built-in indicator lights — one red and one green — and can be controlled manually from the web interface or remotely by Metrici detection engines. Whether you are setting up a visual status indicator at a parking entrance or an access point, this manual provides clear, step-by-step instructions.

Introduction
First Boot
Dashboard
Settings
User Management
Troubleshooting

1. Introduction

The Metrici Signal Light is a hardware product developed by Metrici. It is a compact LAN device with two built-in indicator lights — one red and one green — used to display visual status at parking entrances, access control points, or any location where a simple 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 lights are built into the controller itself. When a Metrici detection engine (such as Area Counter or Line Counter) needs to signal an event, it sends an HTTP command to the Signal Light device, which then turns the appropriate light on or off. For example, when a parking zone is full, the engine can turn the red light on to indicate no available spaces. When a space becomes free, the engine turns the green light on instead.

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

Key features:

Two built-in lights — independent red and green indicator lights inside the device
Automatic timers — set how long each light stays on 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 — lights are controlled by Metrici detection engines (Area Counter, Line Counter, etc.) through simple HTTP commands

Technical Data

Specification	Details
Description	Red/Green indicator LAN controller with built-in lights
Connectivity	1 Ethernet port (PoE), built-in red light, built-in green light
Networking	WiFi 802.11 b/g/n and Ethernet 10/100 Mbps
Protocols	HTTP over TCP/IP
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
Weight	0.4 KG (400g)

Dimensions

Dashboard page showing Network Settings, Red/Green Color Settings with On/Off buttons, and Logs — Dimensions

2. First Boot

The Metrici Signal 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 Signal 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 Signal 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, light states, and logs
Settings — where all configuration changes are made (network, light timers, 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 Signal 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

Red/Green Color Settings

The right side of the Dashboard shows the Red/Green Color Settings panel. This provides:

Timer Red — displays the current timer value (in seconds) for the red light
Timer Green — displays the current timer value (in seconds) for the green light
Red Light — manual On/Off toggle button to switch the red light
Green Light — manual On/Off toggle button to switch the green light

The On/Off buttons allow you to manually control the lights directly from the Dashboard for testing or manual operation. When a button is active (light is on), the On button is highlighted. When inactive, the Off button is highlighted in red.

Logs

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

Red light is ON — the red light was turned on
Red light is OFF — the red light was turned off

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

4. Settings

To configure the Signal Light device, click Settings in the left-side menu — see Fig.2 Settings. Here you can change the network configuration, set light timers, perform backup and restore operations, and update the firmware.

Settings page showing Network Settings, Red/Green Color Settings with timer inputs, Backup/Restore, and Update Firmware sections — Fig.2 Settings

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 Signal 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 Red/Green Light Settings

On the Settings page, the Red/Green Color Settings panel allows you to configure the timers for each light:

Field	Description
Timer Red (s)	The number of seconds the red light stays ON before automatically turning OFF. Set to 0 to keep the light ON indefinitely until a manual or remote command turns it OFF.
Timer Green (s)	The number of seconds the green light stays ON before automatically turning OFF. Set to 0 to keep the light ON indefinitely until a manual or remote command turns it OFF.

After changing the timer values, click Save to apply.

Remote Control via HTTP Commands

The built-in lights 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 Signal Light device, which turns the corresponding light on or off.

Command	URL
Turn Red Light ON	`http://192.168.100.10/red/on`
Turn Red Light OFF	`http://192.168.100.10/red/off`
Turn Green Light ON	`http://192.168.100.10/green/on`
Turn Green Light OFF	`http://192.168.100.10/green/off`

Replace 192.168.100.10 with the actual IP address of your Signal 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/red/on. See the User Management chapter for details.

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

Integration with Metrici Detection Engines

The Metrici Signal Light is designed to work with Metrici detection engines. The engine sends HTTP commands to the device's IP address to switch the built-in lights. 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 documenations here:

Example 1 — Area Counter

In the Metrici Control Panel, open the Area Counter engine settings. Under Engine Working Mode & External Trigger, you will find the signaling device fields — see Fig.4 Area Counter Settings.

Area Counter settings showing Signaling device URL ON and OFF fields — Fig.4 Area Counter — Engine Settings

Enter the Signal Light device's IP address in the signaling device fields:

Field	Value	Effect
Signaling device URL (ON)	`http://192.168.100.10/red/on`	Turns the red light ON when the configured condition is met (e.g., zone is full)
Signaling device URL (OFF)	`http://192.168.100.10/green/on`	Turns the green light ON when the condition clears (e.g., zone has available space)

The Delay between changing states from ON to OFF field controls how many seconds the engine waits before switching between the two signals. The default is 5 seconds.

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

Example 2 — Line Counter

The Line Counter engine works similarly but has separate signaling URLs for COMING (entering) and LEAVING (exiting) events — see Fig.5 Line Counter Settings.

Line Counter settings showing separate COMING and LEAVING signaling device URL fields — Fig.5 Line Counter — Engine Settings

Enter the Signal Light device's IP address in the relevant fields:

Field	Value	Effect
Signaling device URL for COMING events (ON)	`http://192.168.100.10/green/on`	Turns the green light ON when an object enters
Signaling device URL for COMING events (OFF)	`http://192.168.100.10/green/off`	Turns the green light OFF after the delay
Signaling device URL for LEAVING events (ON)	`http://192.168.100.10/red/on`	Turns the red light ON when an object exits
Signaling device URL for LEAVING events (OFF)	`http://192.168.100.10/red/off`	Turns the red light OFF after the delay

Each direction has its own delay setting, allowing you to control how long the light stays on for entering and leaving events independently.

Note: The URL combinations above are examples. You can assign any light color to any event depending on your use case. For instance, you could use green for entering and red for leaving, or the opposite — it depends on what makes sense for your specific installation.

4.3 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 (light timers, 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.

4.4 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.3 User Settings. Only one user account can exist at a time — saving a new username or password will overwrite the previous one.

User settings page showing username and password fields with Save button, and Logs section below — Fig.3 User Settings

Setting a user is not mandatory for the device to work. It is a security feature that prevents unauthorized access to the web interface 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/red/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 Signal 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.

Light does not turn on

Check the physical wiring between the Signal Light device and the light.
Go to the Dashboard and click the On button for the light — the state should change and the Logs section should show the event (e.g., "Red light is ON").
If using HTTP commands, verify the URL is correct and includes authentication credentials if a user is set.

Light stays on and does not turn off automatically

Check the timer value in Settings. If set to 0, the light will stay on indefinitely until it receives an explicit OFF command.
Set the timer to a value greater than 0 (in seconds) if you want the light to turn off automatically.

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/red/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.