Netbell-NTG User Manual

Wiring the Netbell-NTG

The Netbell-­NTG unit is a self-contained web server configured with various input and output circuits designed to output an audio signal to a PA system. You should not use voltages through the Netbell-­NTG exceeding 48 volts. IT IS NOT SAFE.

The output ratings for the Netbell-­NTG are a 30-ohm impedance at 70mA maximum, and a 2.1V audio signal. The line output from the terminal is suited for this and can be wired directly to a power amplifier that uses AC voltage. Take note of the ohm ratings of your speakers and how they are wired, make sure you use the following calculation to determine if you are within the amplifier’s impedance ratings.

The Netbell­-NTG has a stereo line out, a terminal block with left and right outputs, which can be connected to a power amplifier for a higher volume or the ability to drive larger speakers. Make sure the amplifier has a stereo line input, and is rated to drive the speakers you wish to connect too. We are not responsible for 3rd party amplifiers or speakers connected to our device, or the failure of our Netbell­-NTG when wired incorrectly.

We provide 2 cable types (RCA stereo to line out, 3.5mm stereo to line out) to connect your Netbell-­NTG to an amplifier or PA system, etc. Choose the cable that matches your amplifiers audio input to be able to wire it to your Netbell-­NTG.

Ethernet Connection

Plug an Ethernet cable into the NET connector. This device is POE enabled (Please note: this device can only work on IEEE 802.3af or 802.3at standard. Please check your network switch specifications before plugging the device in to prevent potential damage to your device.), the GREEN/Boot LED on the device and the “Connection” LED on the Ethernet connector side will come on if you connect to a POE network switch and a 100MHz network is available, otherwise it will remain off and the “Activity” LED should start blinking indicating network activity. If the device is powered on at this point, DO NOT use the 12VDC power supply at step below.

Power Connection

To power the Netbell-­NTG connect the power supply to the 12VDC and GND power terminal.

When connecting the power supply, connect the positive wire of the 12VDC power supply to the 12VDC terminal, negative cable (marked with a white stripe) to the GND terminal. Plug the power supply to a suitable AC outlet. At this point, the GREEN/BOOT LED light on the board should come on and start flashing, indicating that the Netbell-NTG is operating and is in the “Bootloader Mode”. After about 5 seconds, the GREEN LED will go off and the RED LED will start blinking, indicating the Netbell­-NTG is operating in “Server Mode” and it is accessible on a network utilizing TCP/IP protocols.

Important Audio Wiring Warning:

DO NOT connect multiple Netbell-NTG audio outputs directly in parallel to a single amplifier input.

Netbell-NTG units use active line-level outputs. Paralleling outputs without isolation causes the devices to drive into each other.

Approved methods:

• Line-level audio mixer (recommended)
• Proper resistor summing network (unbalanced audio)
• Audio relay or source selector (single source active)

Prohibited wiring:

• Direct parallel connections
• Y-cables or splitters
• Twisting or tying signal wires together

Failure to follow these guidelines may cause equipment damage and is not covered under warranty.

Audio Output Connection

We provide three different kinds of cable to connect your Netbell-NTG to your amplifier depending on what type of input connection is on your amplifier.

1. The most common audio input for amplifiers is an RCA connection, we pre-wired the RCA cable to the Netbell-NTG Line Out terminal block, you can plug this cable to the Line Out terminal directly.
2. If your amplifier uses a 3.5mm stereo audio jack input then use the provided 3.5mm stereo to line out cable. The WHITE wire is to be wired into the LFT terminal position, the RED wire is to be wired into the RGT terminal position and the BLACK wires are always wired into the GND terminal position.
3. If your amplifier uses an audio line input then use two 18-gauge 2-­ply cable (not provided). As the wires for the 2-ply cable will be the same color for both left and right sides, wire the left side first then once completed wire the right side to avoid crossing the input/outputs. Use the black wires for the GND positions and the red wires for the LFT and RGT positions for each respective input/output.

Relay Output Connection
There are two relay outputs on the board. They are both dry contact (48V max 5A@12VDC, 3A@24VDC). There are 3 terminals for each relay labelled: NO, C, and NC which stand for Normally Open, Common and Normally Closed. Physical bells/buzzers can be connected to the C and NO terminals. When wiring physical bells or buzzers to the relay output, you need to select a suitable power source that meets the requirements of the bell or buzzer. Wire one side of the power source to one side of the bell – The other power wire is connected to the relay terminal C. Finally, connect the other side of the bell wire to relay terminal NO.

Digital Input Connection
There are 4 digital inputs (5-¬24VDC) built on the board for triggering special notifications/emergency alerts. A sensor such as temperature sensor or a push switch can be connected to the digital input. Please note, when connecting a 12VDC-¬48VDC sensor to the input, an external resistor (provided upon request, 2.2k ohm 0.5watt) must be used.

There are two modes of operation for the digital inputs: ISOLATED and PULL UP.

1. ISOLATED mode allows you to directly drive the Netbell-­NTG’s opto-isolator with an external voltage though and internal 1K resistor. This voltage may be in the range of 5VDC to 48VDC supplying a minimum of 2mA or a maximum of 30mA to the opto-isolator diode. There is no other internal connection to this voltage so it is an isolated input.
2. PULL UP mode connects a 1K resistor to an internal voltage allowing you to use a simple switch (such as a magnetic door switch) across terminals 1 and 2. When the switch is activated a signal is sent to the input. These modes are selected by the switch on the server (see the board layout for reference) marked ISO and PU for isolated or pullup respectively. On the Netbell-­NTG put the switch up for pullup and down for isolated.

Wiring a push button: For distances up to 500 feet, a 20 AWG shielded wire is suitable for wiring a push button. If the distance between the push button and the controller extends up to 5,000 feet, use a 16 AWG shielded cable instead. Keep in mind that longer cable runs are more susceptible to signal interference.

CAUTION: These units are ground isolated. Always connect so that power loop is only connected to the Netbell-NTG unit. Do NOT use external ground connections. Doing so may damage the Netbell-­NTG or POE originating device. If you intend to use the isolated mode, set the input switch before applying an external voltage. Doing otherwise may damage the Netbell-NTG or POE originating device.

Wiring a Background Music Connection

The Netbell-­NTG is capable of using its relays to switch between an external stereo source such as a PA system or a music player. Following the wiring schematic above, the External source is wired into the relays using a Normally Closed circuit. It is then connected to the audio Line Out of the Netbell­-NTG.

The Netbell-NTG must then be configured to disconnect the music source while playing the tone. Please refer to page 23 for instructions to program your Netbell-NTG for this.

Netbell-NTG Speaker System Wiring Diagram

• Speaker Connection

The wires on your speaker:

• 30W Speaker: White (70V/positive), green/black (com/negative).
• 20W Speaker: White (70V/positive), black (com/negative).

This is a 70V speaker system. 70V speakers are designed to be wired in parallel, with the wattage adding up to be no more than 80% of the amplifier’s wattage output as to give you ample headroom. The wiring schematic below shows how to wire 3 speakers, additional speakers could be added to the 70V circuit exactly like the previous speakers. To connect the speakers, refer to the diagram below to wire these speakers in parallel. Use the 70V wire for the amplifier’s 70V output, and the com wire for the ground/negative (COM/-). The diagram below shows how to wire 3 speakers, additional speakers would be added to the 70V circuit exactly like speaker #3. For more detailed instructions on how to wire the speakers to the amplifier, please refer to the amplifier manual that comes with your system.

Cable Requirements: If you need to extend the cable, the cable needs not be shield in most case and should be of sufficient gauge to minimize losses due to the resistance of the wire over long runs (insertion loss). Cable thinner than 18-gauge AWG is not recommended. Long runs require 16-gauge AWG or heavier.

In some cases where the output cable is run in close proximity to unshielded intercom cables, electrical cables, radio transmission antennas or other sources of interference, or when the amplifier is being used for paging from a telephone system, the amplifier may require shielded output cabling to prevent audio feedback or interference.

Max length of wire: It is recommended that high quality, heavy gauge, two conductor twisted speaker cable is used when connecting your loudspeakers. 14-16 AWG wire will work in most applications. The maximum length of speaker wire for a 70V line depends on the gauge of wire being used. You will find a chart with different gauges and their maximum length for use in a 70V system below.

• Speaker Placement

Ceiling speakers:  Ceiling speakers are used with drop-tile ceiling panels and are appropriate for heights between 8 and 20 feet. A rule of thumb for placement is twice the ceiling height. So if your ceiling height is 8 feet, for example, speakers should be placed 16 feet apart.

Wall baffles:  Instead of radiating sound downwards as with a ceiling speaker, wall baffles send soundwaves horizontally. Normally spaced 20 feet apart, wall baffles should never directly oppose each other. Wall baffle speakers are a good option for office, school which have a ceiling height over 20 feet, but aren’t large enough to warrant horns.

Horns: Horns are typically used in manufacturing, warehouse, and outdoor environments. Horns can be mounted 15 to 20-plus feet off the ground, and spaced 50 to more than 100 feet apart, aiming 30 degrees down from horizontal (60 degrees up from straight down). Like wall baffles, horns should never directly oppose each other.

Begin in one corner of the area. The first speaker in Row 1 is positioned a distance equivalent to (1/2C). The next speaker in Row 1 should be a distance equivalent to (C) from the first speaker. Each additional speaker in the row should use this same spacing. Row 2 starts at the indicated distance (D) from Row 1. Using the diagram as a guide, fill in the remaining rows in this same alternating pattern until the entire area is appropriately covered.

See the layout sample and chart below:

Ambient Noise Range	Speaker Power Taps (Watts)	C	D
Medium Noise (65dB-75dB)	20	110	70
High Noise (75dB-85dB)	20	100	65
Very High Noise (85dB-95dB)	20	65	40
High Noise (75dB-85dB)	30	100	65
Very High Noise (85dB-95dB)	30	95	58

• Speaker Installation (30W Horn Speaker)

1. The 30W speaker is constructed with a pivoting, cast-iron base.
2. The base contains 3 holes for screws. Use screws with greater than 1/4” diameter head to ensure safe installation. Screw the base to the mounting surface where you wish to install the horn.
3. There are 2 screws connected to the horn for mounting, choose one, and remove from horn.
4. Slide screw through hole in top of base and tighten.
5. There are two angle adjustment points in the base. The screw connected to the base will allow you horizontal movement, while the wingnut near the mounting surface will allow vertical movement. Loosen either to adjust and when at desired angle(s), tighten.
6. On the rear of the horn is a selectable 70/25V transformer. Using chart printed above transformer screw, turn screw to desired power rating and voltage setting. TAKE PRECAUTION THAT THE POWER YOU SELECT, IN COMBINATION WITH OTHER SPEAKERS, DOES NOT EXCEED 80% OF RATED POWER OF YOUR AMPLIFIER. Please consult Linortek Technical Support if you are not familiar with this concept.
7. To aid weather-proofing, the wire connections are sealed internally, and accessible through a 2’ lead.
8. Connect the White (positive) & Black (negative) wires to the corresponding outputs on your amplifier.
9. The green/yellow ground wire should also be connected to building structure or grounding apparatus.

Finding the IP Address to Access the Software

By default, the Netbell is DHCP enabled. When a Netbell SERVER unit is first installed on your network, it automatically obtains an IP address from your router via DHCP if your router is set up to assign one. If your router is not set this way, please use Option 3 to use default IP address to access the software, as well as how to set a static IP address for your device.

There are several ways to find the Netbell IP address on your network.

Option 1: Using the Discoverer Program to locate the IP address

We have developed two types of Discover apps to help our customers find the IP address on the network:
• Our upgraded Discover app, developed for Windows PC and Android phones
• A Java-based app that can be used on all types of computers, as long as your computer has Java runtime installed.

If you are using a Windows computer, we strongly recommend using the upgraded Discover app.
To download the Discoverer program, please go to: https://www.linortek.com/downloads/support-programming/

• Linortek Discover for Windows

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.

Alternatively, you can download the Java-based Discover program if you believe you have the Java runtime installed on your PC.

• Linortek Java-Based TCP/IP Discoverer

The Linortek TCP/IP Discoverer is a program that will automatically locate your Netbell server. Because discoverer is a Java program, Java runtime needs to be loaded to use this feature. Java can be found here: https://www.java.com/en/download/.

When downloading the Java Discoverer program, sometimes you will see a popup warning message depending on your browser security settings, asking if you want to keep or discard this file, please click the Keep button as this is a Java program, it won’t harm your computer.

Once Discover locates your device, it will display:

1. Port Number (Discover for Windows App only, it will display the port number of your device, by default it’s set to 30303, which is used for most of Linortek products.
2. IP Address
3. Host Name
4. MAC Address
5. Other Info:
   • Blue LED (if on)
   • Product Name
   • Server Software Revision

Click the device you want to use shown on the Discoverer program to launch the SERVER web pages in your browser. Click the Login button on the homepage. Default username/password is: admin/admin. You may change these as you desire or disable this feature in the Settings menu.

Option 2: Using Command Prompt on your PC to ping the device

If you can’t make the Discoverer program to work, you can ping the server to get its IP address on your network. Here is how:

1. Open the Start menu on your PC and type cmd on search bar, select Command Prompt.
2. Type ping server and press Enter.
   If the ping is successful, you should receive replies from the address that you are trying to ping. Open your browser and type in the IP address displayed on the command prompt window.

Option 3: Connect directly to your PC to use the default IP address

If you still have trouble finding the IP address, or your network doesn’t support DHCP, you can connect the SERVER directly to your computer’s Ethernet port, TURN OFF WiFi, open your browser, and type in the SERVER’s default IP address: 169.254.1.1 to access the webpage to setup your device.

Once logging in the page, you can set a static IP address by going to Configure – Network Config page. Once a static IP address is assigned, you can connect it to your network, access the software through the static IP address.
 

Basic Software Configuration

If you are configuring your Netbell-NTG for the first time, the section below will demonstrate how to enable the audio system. If you have already done this, skip to the section Assigning Audio Tones to Relays.

Enabling the Audio File System

Upon logging into your Netbell-NTG for the first time you will need to activate the audio system.

1. Navigate to the SETTINGS dropdown menu, then click SETTINGS.
2. Enter audio in the UART Usage field (not case sensitive).
3. Check the box Use Audio File System.
   Click SAVE, the device should start playing through the files on the SD card now.

Setting Time and Date
When first configuring your Netbell-NTG you will need to verify the time and date on your home page. Your Netbell-NTG is configured by default to use Eastern Standard Time (GMT-5) and will apply correction for daylight savings time. To change these settings, navigate to the Settings dropdown menu and then choose Time/Date. You can then change your time zone by adjusting the value in the third box labeled Time Zone.

If you intend to keep your Netbell-NTG off your network after configuring, you will need to uncheck Use Daylight Savings Time and Use NTP Update. You will then have to manually set the time to account for daylight savings, and adjust the time periodically to account for time creep.

If you wish to use your internal NTP server, please check the following instructions.

How to Use Your Internal NTP Server for Linortek Devices

CAUTION: Incorrect settings might cause your devices unable to update the time from the NTP server.

Assigning Audio Tones to Relays

As we use a relay to trigger a tone on the Netbell-NTG controller, the relay is used only as a triggering tool and does not function as a physical switch in this case. You can assign the audio tone to any relay (1–8) and schedule it from the Scheduling page (Services → Bells page).

Tip:
When you go to Services → Relays, only 4 relays are visible by default. To enable 8 relays:

1. Go to Settings → Settings
2. Check Extend Relay Range
3. Click SAVE
4. Return to Services → Relays
5. Change relays4 to relays8 in the URL

Example:

http://172.16.10.105/p/relays4.htm
http://172.16.10.105/p/relays8.htm

Audio Files

The device comes with 40 default sounds installed from the factory. These can be reviewed at:
https://www.linortek.com/netbell-standard-sound-list/

If you prefer to use custom sounds or prerecorded messages, you may add them to the SD card (up to 10 hours total) in .OGG format. The Netbell-NTG only supports .ogg files.

If your files are not in this format, convert them using Audacity. Refer to the Creating Custom Sounds section of this manual for detailed instructions.

In this example, we will use the tone BELLT001 and assign it to Relay 1.

UART Control Commands

The device supports UART commands for controlling audio playback:

• c — Activates loop (continuous playback)
• C — Cancels playback / stops play mode

These commands can be sent using the SEND UART function when configuring tasks.

Scheduling a Tone with UART Control

1. Navigate to the Tasks page on your Netbell-NTG
2. Click the Edit icon at the end of the first available line
3. Enter a name (if desired) in the Schedule Name field
4. Check the Use box
5. Set Device A to RELAY
6. Set Data A to 01+ (This refers to the Bell 1 on the bell schedule page for bell 2, 3, … use 02+, 03+, …)
7. Set Device C to SEND UART
8. Set Data C to PBELLT001OGG (This must be an 8-character name preceded by P and followed by OGG. This must be capitalized)
9. Set Action to ON
10. Click SAVE

Optional: Using Loop and Stop Commands

To enable continuous playback, add a SEND UART action with Data C: c

To stop playback, add a SEND UART action with Data C: C

These commands can be used in separate tasks or combined with scheduled events as needed.

Scheduling Audio Playback

Once the audio system is enabled and you have assigned a tone/message to a relay, you can then program your Netbell-NTG for audio playback. This can be done using the Netbell-NTG’s built-in bell scheduler, or by using an external signal as a trigger.

Creating a Bell Schedule from the Bells Page
Each Netbell-NTG can set up to 500 bell event schedules. To add an event schedule, navigate to the Services dropdown menu, then select Bells. You will see the following page:

You may use this page to enter up to 500 events. An event can be created in 9 simple steps.

1. Enter an event name up to 15 characters long (use letters and numbers only)
2. Use the 3 fields labeled Time to enter the time in HH:MM:SS (Note: the first field to select the hour uses a 24hr format. For 12 AM select 00, for 1 PM select 13)
3. Duration: Enter any number in the Duration box and select a duration multiplier (mS, Sec, Min), skipping this box might cause your schedule not working. The max duration the Netbell-NTG can play depends on the length of the audio file. For example, if the audio file is 10 seconds, it will continuously play for10 seconds no matter what duration you set here.
4. (Optional) Enter a date. This will trigger the event only on this specific date
5. Click the Add button. You will see this event listed above. Subsequent events will be listed in chronological order
6. Once an event is added, you may adjust which relay output is triggered by selecting pips 1 – 8 under the Bell column. By default, 1 and 2 are automatically selected. Note which numbers you are using as you will need to assign a sound to each one. For numbers 5 – 8 see the section Activating Extended Relay Range.
7. You may choose which days of the week will use this event under the Day column. Days are listed Sunday – Saturday (Note: if a specific date is chosen it will override the Day column)
8. Check the Use box to enable this schedule. If you only want it to trigger one time, check the Once box

Below is an example of what a bell schedule may look like.

Deleting Items
You can delete an item from your schedule by clicking the DEL button to the right of the list. To clear the entire schedule, enter #!reset@memory! Into the Name field and click Add.

Uploading a Premade Schedule
You may upload a Premade schedule by entering #upload into the Name field and click Add. This will take you to a new page. Click Choose File to browse your computer for the schedule in either .txt or .csv format. Once selected, click Upload. This will return you to the previous screen with your new schedule listed.

You can create a schedule using a Plain Text editor such as Notepad. Your first line should be #Start – each subsequent line will be a separate entry with 13 items, each separated by a comma. Save this file as Plain Text (.txt).

Saving your Bell Schedule
To save the bell schedule on your Netbell-NTG, click on the Download button in the bottom-right. This will open a new tab in your browser and display the schedule as plain text. Copy and paste this text into a plain text editor such as Notepad and save.

Below is a sample prewritten bell schedule.

Using an External Trigger

You may also program your Netbell-NTG to play a tone upon input from an external trigger such as a pushbutton or door contact switch.
Note: unless your trigger device supplies its own power, ensure your input switch is set to Pull UP (PU) (See Wiring the Netbell-NTG and Board Layout Reference)

Activating the Digital Input

Note: The following guide will assume you are using Digital input 1 and the tone EVACUATE.
Navigate to the Services dropdown menu and select Inputs. The top 4 items are your digital inputs. They are marked DIN 1 – DIN 4. Click on the blue pencil icon under DIN 1 and enter the following settings.

1. Enter a name in the Name field (if desired)
2. Enter a label in the Label field (if desired)
3. Check the Use box
4. Set Type to State
5. Set Display to Dot
6. Set Relay L/T to 0
7. Set Command L/Z/N/I to Inv
8. Click SAVE

Setting Task for Digital Input
Now that your external trigger is wired to your Netbell-NTG and your digital input is configured, you will need to set up a task.

1. Navigate to the Tasks page
2. Click the Edit icon on the first available task
3. Name the task if desired
4. Check the Use box
5. Set Device A to Digital
6. Set Data A to 1S=1 (1 represents the number of the digital input, S signifies to your device to refer to input state, the last 1 signifies the state is on)
7. Set Device C to Send UART
8. Set Data C to PEVACUATEOGG (to play sound file EVACUATE in this sample)
9. Set Action to ON
10. Click SAVE

If you are using a trigger such as a door contact switch, set Data A in the example above to 1S=0 to play the tone when the contact is broken.

Programming Netbell-NTG to Interrupt Background Music

Your Netbell-NTG can also be interrupt background music from an external source. Once your Netbell-NTG is wired to your audio system shown in page 8, you can program the Netbell-NTG to open its relays, play a prerecorded tone or message and then resume the background music connection.

First, create a bell schedule event for the desired times. Relays (bells) 1 and 2 will need to be triggered to disconnect the external source. And use relay 3-8 on the bell schedule page to play the audio file on your Netbell-NTG

Next create a task using relay 3-8 as described in page 17 to trigger the tone or message.

Enabling Extended Relay Range

While your Netbell-NTG only has 2 relays built-in, you can activate up to 8 relays for the purpose of scheduling additional tones and messages. To enable these software relays, follow the following steps:

1. Navigate to the Settings dropdown menu and select Settings
2. Check the box labeled Extend Relay Range
3. Click SAVE

Now that the extended relay range is activated, you can assign tones to relays 5-8 in the Tasks page. These will correspond with Bells 5-8 on the bell schedule page.

Creating Custom Sounds

The device comes installed with 40 default sounds from the factory. You can create custom sounds or record messages and save them to the built-in micro SD card to play your Netbell¬-NTG. The Netbell¬-NTG uses the .ogg file format for the playback of audio. If your custom sounds or messages are not in this format you will need to convert the file to an .ogg file.

We recommend using Audacity to create your custom tones and messages. Audacity is a free program that enables you to record directly to .ogg format and also to convert other audio files into the .ogg format.

Note: When creating your custom file, the name of the file must be 8 characters long using only capitalized letters or numbers.

Audio File Guidelines

Adding custom sounds or messages to the Netbell-NTG

1. Choose your preferred sounds or record your own message from your computer or your phone.
2. Open the lid of the Netbell-­NTG and remove the Micro SD card out from the slot on the board.
3. Insert the card into your computer’s Micro SD card slot or put it in a Micro SD card reader and connect to your computer.
4. Convert your audio files to .ogg format using Audacity. (You may use any other program to convert your audio files into .ogg format, however we found Audacity is the simplest solution to record, edit, and convert audio files to be .ogg file.
5. Export the audio file from Audacity and save to the Micro SD card after converting. When exporting the file, make sure the file name is 8 characters long such as sound001 or the audio file system will not recognize it.
6. Remove the Micro SD card from your computer or card reader and insert it back into the Netbell­-NTG’s card slot.
7. Refer to pages 17 – 21 to program your Netbell-NTG to use your new sounds.

Using Audacity

1. Download the Audacity program to your computer from here: https://www.audacityteam.org/
2. Open the audio file in the Audacity program by clicking OPEN in the FILE dropdown menu.
3. Export the audio files as an OGG file by clicking EXPORT under the FILE dropdown menu, then clicking Export as OGG, save it to the SD card.

Video Tutorial: How to Create Custom Sounds for Netbell-NTG PA System Controller

Note: To change the pitch (the sound quality), select the whole file in Audacity by typing “CTRL + A,” Then going under “Effect” and clicking “Change Pitch.”

Loop, Cut, and Return-to-File Mode UART Commands

Certain audio commands can be activated manually or through the schedule.
Just as you assign a tone by entering P<filename>.OGG in the Data C field, you can enter the following commands:

• c – continues play. Loops all audio files stored on the SD card.
• C – Stops audio playback based on a condition (for example, stopping a 1-minute file when Relay 1 turns OFF).
• f – File mode. Returns to normal file playback mode (used to exit continuous play started with c).

Board Layout Reference

1. Micro SD card slot
2. Audio Module
3. Digital input switches (the order is 4, 3, 2, 1 from left to right)
4. RJ45 Connector
5. Reset Button
6. Reload Button (turns on blue LED – identified on Discoverer)

This is an image of a bare board Netbell-¬NTG, it explains the inputs and outputs of the device and the ratings for each. The device comes with a 1GB Micro SD card, and will be enough for over 10 hours of audio playback. If more is desired a larger Micro SD card can be easily installed. The line out is divided into left and right for stereo sound and can be used with an amplifier, it has a 30-ohm impedance rating. A 12VDC power supply is provided with the controller, it is also POE (Power Over Ethernet) enabled (Please note: this device can only work on IEEE 802.3af or 802.3at standard. Please check your network switch specifications before plugging the device in to prevent potential damage to your device.).

Factory Reset

To reset the SERVER to its factory defaults, first to push the RESET button, the RED LED should be blinking and the GREEN LED is on. While in this state (called Bootload state) press and hold the RELOAD (DFLT) button (about 10-15seconds) until the RED LED comes on steady (blinks at 1 second rate).

There is an equivalent RESET DEFAULTS function in the web browser at System/ Load/Reboot System page. Check the Restore Default Values box, then click the Boot Mode button, your device will be reset to factory default once the RED LED come back to normal (blinks at 1 second rate).

For instructional videos, FAQ’s and contact information for our technical support team, please visit: https://www.linortek.com/technical-support

For full instructions on the Web Interface please see the Fargo G2 and Koda Manual available  at: https://www.linortek.com/downloads/documentations/