Netbell-Ultra 300 Network Bell Controller

Quick Setup Guide
⏱ Estimated Setup Time: 20–40 Minutes

1 Materials 2 Wiring 3 IP Based Accessories Setup 4 Device Configuration

Step 1 – Unbox and Identify Materials

Unbox all components and compare with the included packing list.

  • 1M RJ45 Ethernet Cable

  • 12VDC Power Supply

  • Netbell-Ultra 300 Setting Instructions

  • Netbell-Ultra Installation and wiring Instructions

Step 2 – Wiring the Netbell-Ultra 300 Controller

Connect the Netbell-Ultra 300 Controller to a power supply, ethernet connection, and bell outputs.

  • Power

    Identify the included 12VDC power supply. Plug it into a power source and into the Netbell-Ultra 300’s  USB-C power socket labeled POWER.

    Alternatively the device can operate on PoE if connected to a PoE switch or PoE injector.

  • Ethernet

    Identify the 1M RJ45 cable and establish an ethernet connection between the Netbell-Ultra 300 and your switch.

    Note: If connecting to a switch port that provides Power over Ethernet (PoE), remove the 12VDC power supply as only one source of power is needed. Using two sources of power can damage your device and cause undesired behavior.

  • External Bells/Buzzers

    The Netbell Ultra 300 has two relay outputs that can independently control two sets of bells, buzzers, or other signaling devices.

    Relay Output Specifications

    • Type: Dry Contact (1-Form-C signal relay)
    • Maximum Rating: 30 VDC @ 1 A per relay
    • Each relay has three terminals:
      • NC – Normally Closed
      • C (COM) – Common
      • NO – Normally Open

    Important: The Ultra 300 relay outputs are designed to provide control signals, not to directly power electrical loads. Bells, buzzers, and other inductive loads may draw excessive current or generate electrical interference that can interrupt operation of the Ultra 300 and require a power reset.

    When controlling a bell, buzzer, or other load, an intermediary relay must be installed between the Ultra 300 and the load. The Ultra 300 should activate the intermediary relay, which then switches power to the bell or buzzer.

    Using an Klemsan step-up Relay:

    Step-Up Relay Connection to Netbell-Ultra300:

    • Connect terminal A2 of the step-up relay to the Voltage (V) terminal of the Ultra300
    • Connect the COM (C) terminal of the Ultra 300’s relay outputs to Ground (GND) terminal using short jumper wires.
    • Connect the Normal Open (NO) terminal of the Ultra 300’s relay outputs (OUT1 or OUT2) to the step-up relay A1 terminals.

    Connect Bell/Buzzer to the Step Relay:

    • Power Supply Selection: Choose a power supply that matches your bell/buzzer requirements; ensure power supply is properly rated for your device.
    • Connect one wire from the power supply to one of the bell/buzzer wires; match polarity if using VDC power.
    • The other power wire is connected to NO terminal on the step relay
    • Connect the remaining bell/buzzer wire to the C terminal of the step relay
    • Plug the bell power supply into an AC outlet

  • External Pushbutton / Signal

    The device has two digital inputs with push-in spring connectors, labeled IN1 and IN2 on the enclosure. Each input has two terminals:

    • C – Cathode (–)
    • A – Anode (+)

    The digital inputs allow the SERVER to detect the ON/OFF state of an external device or sensor. Each input can operate in one of two modes: PULL UP (PU) or ISOLATED (ISO).

    PULL UP (PU) Mode

    PULL UP mode is used when the signaling device provides a dry contact.

    In this mode, the SERVER connects the input through an internal 1 kΩ resistor to an internal voltage source. This allows a simple switch or dry contact device, such as a magnetic door switch, to trigger the input.

    When the contact closes, the SERVER detects the change in state.

    Signal Source: Dry Contact

    ISOLATED (ISO) Mode

    ISOLATED mode is used when the signaling device provides an external voltage.

    In this mode, an external voltage directly drives the SERVER’s optoisolator through an internal 1 kΩ resistor. The input accepts 5–24 VDC, supplying a minimum of 2 mA and a maximum of 30 mA to the optoisolator diode.

    There is no other internal connection to the applied voltage, allowing the input to remain electrically isolated.

    Signal Source: External Voltage

    Selecting the Input Mode

    The operating mode for each digital input is selected using the corresponding switch on the device’s board. Refer to the Board Layout Reference for the switch locations.

    • UP – PU (Pull Up)
    • DOWN – ISO (Isolated)

    The inputs are factory-set to ISO (DOWN) by default.

    CAUTION: Before applying an external voltage to an input, verify that its switch is set to ISO. Applying external voltage while the input is configured for PU mode may damage the Ultra or the originating PoE device.

    Wiring the Digital Inputs

    Dry Contact Signal (PU Mode):
    Connect the two wires from the dry contact device to the C and A terminals of the same digital input. Polarity is not important for a dry contact.

    External Voltage Signal (ISO Mode):

    • Connect the positive (+) wire from the signaling device to the A terminal.
    • Connect the negative (–) wire from the signaling device to the C terminal.

    Do not mix terminals between IN1 and IN2; both wires must connect to the same digital input.

Step 3 – Accessing the Web Server

Finding the Netbell controller on your network, accessing the web server, and applying network configurations

  • Using Linortek Discover to find your Netbell

    Download and install the Linortek Discover desktop app using the link provided below.

    Linortek Discover for Window

    The program you download from our website is a zip file, you will need to extract the file first after downloading. After extracting the zip file, you will see a file called “Linortek_Discover_Windows.exe”, double click the file, you will most likely to see a popup window stating that “Windows protected your PC, Microsoft Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk.” with a “Don’t run” button.

    You need to click “More info”, the app name, publisher information will display, click “Run anyway” to open the app, it won’t harm your computer.

  • Finding your Netbell’s IP address and Setting Network Configurations

    Access using Discover:

    By default, your Netbell comes with DHCP enabled meaning if configured a DHCP server will automatically assign it an IP address.

    Once started the Discover application should display the Linortek devices on your network. If multiple Linortek devices exist use the MAC address printed on the device to identify the target device.

    Click on the target device to access the web server.

    Note: It is recommended that the device running discover is on the same LAN/VLAN and subnet of the Netbell. Otherwise, it will not be listed or easily accessible unless inter-VLAN routing is configured.

    If you’re unable to find your device using Discover:

    Open Command Prompt (Windows) or Terminal(macOS) and run the following “ping SERVER”. If you get a response, copy the IP address of the responding device and paste it into the address bar of a browser.

    Lastly if all previous attempts fail, connect the ethernet cable from the Netbell-Ultra 300 directly into your computer. Using a web browser enter 169.254.1.1 into the address bar (this is your Netbell’s default IP address)

    Logging in:

    When prompted to login enter the default credentials Username: admin, Password: admin.

    Assigning a static IP:

    It is recommended but not required to set a static IP address to ensure reliable access to the web server. If left with DHCP enabled, it’s possible that a new IP address is assigned in the future and the use of the discover tool will be needed for future access.

    To assign a static IP go to Configure -> Network Config. Disable the “Enable DHCP” check box and enter your network configuration as needed. Document the IP address assigned for future access.

Step 4- Configuring your Netbell

Configuring Time, bell schedules, push buttons, and bell duration.

  • Setting Time and Date

    When first configuring your Netbell, you will need to verify the time and date on your home page. Your Netbell is configured by default to use Eastern Standard Time (GMT-5) and will automatically adjust for Daylight Saving Time. If your location is not in the Eastern Time zone, please make sure to set your Time Zone first. Using an incorrect time zone will cause the bells to ring at the wrong time.

    To set your Time Zone:

    • Go to Settings > Time/Date
    • Enter your local Time Zone (for example, -5 for Eastern Time Zone, -6 for Central Time Zone, -7 for Mountain Time Zone, -8 for Pacific Time Zone)
    • Make sure the Use NTP Update box is checked (when this box is checked, the Netbell will update its time from the NTP server every 30 minutes by default)

    Note: If an ethernet connection is not supplied during normal operation, the Netbell will be unable to receive NTP updates. This can lead to a misalignment of you schedule over time. To fix this provide an ethernet connection and either manually correct the time in the time textbox or set NTP Interval text box to 1, receive an NTP update, and set it back to 30 afterwards.

  • Bell Schedules

    Your Netbell-Ultra 300 can store up to 10 unique bell schedules that can easily be enabled or disabled as needed. To view all created schedules, go to Services → Schedules. By default, Schedule 1 is enabled. To add a new schedule, use the text boxes at the bottom of the page. Enter a name and brief description for the schedule, then click Add. The new schedule will appear in the schedule table. To enable or disable a schedule, click the Use PIP in the right-hand column. A green PIP indicates that the schedule is enabled, while a red PIP indicates that it is disabled. The enabled schedule will be the scheduled edited in the services-> bells page.

    Configuring your bell schedule:

    1. Go to Services -> Bells
    2. In the Name textbox enter a name for the scheduled event
    3. Set the time using the dropdown boxes next to the time label. The following is the format for time HR:MIN:SEC. Note: Your entry needs to be in 24HR format. Ex. 3PM -> 15:00:00
    4. Set the duration for the bell using the following format. # + drop box selection (mS,Sec,Min)
    5. Skip if recurring bells are needed. Select the calendar drop-down and select a date.
    6. Click Add

    Your scheduled bell now exists, by default it will ring bells on outputs 1 and 2, M-F. To change this simply click the circles associated to toggle between on and off.

    Saving your bell schedules:

    Save your bell schedules to create backups in case of data loss or to switch in and out multiple schedules.

    To do so click download in the lower right, you should see a screen with a CSV representation of your schedule. Copy the entirety of this data including #start into notepad and save as a .txt file.

    Uploading bell schedules:

    As if you were creating a bell schedule entry, enter #upload in the Name textbox and click add. You should be prompted with the bells upload page, click Choose File and select the desired bell schedule. Click upload and your bell schedule will be applied.

  • Push Buttons

    Configuring digital input:

    First identify which digital input terminals is used. Each set is labeled IN 1 and IN 2

    From the web server go to Services -> In/Out.

    1. Click the edit icon for the digital input terminals used and enter the following
    2. Check “USE”
    3. Display: “Dot”
    4. Relay L/T:  Enter Bell output number you would like to activate followed by T to trigger the Relay output or L to link the Relay to the Input’s state. For example, 1T
    5. Command L/Z/N/I: “INV”
    6. Click Save

    Bell Duration:

    By default, bells will ring for 3 seconds whenever triggered by a digital input. To change this, do the following

    1. Go to Services -> Relays
    2. Click the edit icon for the # entry you provided for “Relay L/T” Ie. “1T” -> edit Bell No. 1
    3. Enter a numerical value for pulse width (how long the bell will ring)
    4. Set the pulse width multiplier to mS,Sec, or Min (Unit of measurement applied to pulse width)
    5. Click Save
PreviousNext
PreviousNext

FAQ’s

There are two main methods to manually activate a sound for evacuation on your Netbell device without requiring additional hardware:

Method 1: Web Interface

  1. Log in to your Netbell device’s webpage
  2. Navigate to the Services + Relays page
  3. Click the red dot under the State tab
  4. This will manually activate the evacuation bell

Method 2: RESTful API via Mobile App

You can use the device’s RESTful API to activate the relay (bell) through a third-party mobile application:

  • For iPhone users: Rest-HTTP API Client (or similar apps)
  • For Android users: Various free REST API client apps are available
  • These apps allow you to send API commands to trigger the evacuation sound remotely

Are there other activation methods available?

Yes, the most straightforward method would be using a physical push button. However, the web interface and API methods described above provide the manual control you need without requiring any additional hardware.

Which method is recommended?

  • Web Interface: Best for manual activation when you have computer/tablet access
  • Mobile API: Ideal for remote activation and emergency situations when you need to trigger the alarm from anywhere with internet connectivity

Both methods provide reliable manual control of your evacuation system without the need for additional buttons or accessories.

There might be two reasons: The first one is cookies/cache browser issue. To fix it – just click PAUSE and LOGIN again (upright corner). If it does not work, please click DOWNLOAD (bottom left corner), make sure you can see your entries in a txt format. If you can, make sure Names don’t include “&” symbol. If you find “&” as a part of a name for some of your event, you need to rename it and reupload your schedule.

The distance you can run the wires depends on two factors: the power supply you use for the bell and the wire gauge. You can use this voltage drop calculator to determine the maximum wiring distance for your specific setup: https://bit.ly/133XfS6

If you use the power supply we provide with our product, you can run:

  • Up to 250 feet using 18 gauge wire
  • Up to 500 feet using 16 gauge wire

You can schedule up to 500 events per schedule, your Ultra 300 can hold up to 8 schedules.

Additional Resources

Troubleshooting Tips Troubleshooting Tips

Troubleshooting Tips

Common issues and solutions when setting up or operating your Netbell system.

Full Manual Full Manual

Full Manual

For more information follow the Netbell-Ultra 300 Manual

Remote Device Setup Remote Device Setup

Remote Device Setup

Configuration instructions for remote push buttons and remote Netbell device communication.

Video Tutorials Video Tutorials

Video Tutorials

Check our Video Tutorials for step-by-step instructions.