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  • KeyFob I2C Converter with Macro Trigger Functions
  • Secure KeyFob Remote Operation up to 700 Feet Away
  • 8-Port Master Hardware I2C Converter
  • KeyFob Receiver with Macro Trigger Functions
  • Dual Communications Interface Ports
  • Choice of Two Communication Modules
  • Communicates with Two PCs Simultaneously
  • Supports Many Communication Expansion Options Including:
    • Ethernet, WiFi TCP/IP, and WiFi MQTT
    • Bluetooth, RS-485, RS-232, and Long Range Wireless
  • Eight 5V nodeLynk I2C Communication Ports
  • 2-Amp Power Supply Shared Among All 8 nodeLynk I2C Ports
  • I2C Bus Scanning, I2C Write, and I2C Read Commands
  • I2C Port Switching and I2C Write Read Commands
  • Test, Control, and Learn I2C Communications
  • Connect Sensors for Monitoring Applications
  • Control Relays, Pumps, Lights, and More
  • Long-Range Wireless I2C Upgrade Option
  • Integrated ProXR Enterprise Command Set



KeyFob Serial to I2C Converter Adapter

Introducing the world’s most powerful and expandable Serial to I2C Converter now available with KeyFob Remote Control.  With Eight nodeLynk I2C Expansion Ports and Two Interchangeable Communications Ports compatible with Digi XBee®, this powerful I2C adapter offers the highest possible conversion speed with the most efficient command set available.  Communications modules may be interchanged for your choice of communication requirements.  Based on the endNode architecture, this controller provides an excellent platform to help simplify communications to otherwise complex I2C devices.  Over a year in development, this device served as the development platform for our endNodes architecture, which includes an incredible command set for relay control, far beyond I2C conversion.  New features include hardware I2C communications now supporting speeds up to 700KHz.  Set the communications speed of each nodeLynk I2C Port as part of Device Configuration.  This device now includes a new command set that simplifies read and write operations to I2C devices.  New I2C Bus Scan functions scans and reports all detected devices on each I2C port in less than 1 Second.

An I2C Converter with Brains: endNode Architecture & ProXR Enterprise

We’ve also added ProXR Enterprise to the command set, which is our most powerful relay control command set to date.  Capable of controlling up to 1,024 relays using 8 nodeLynk I2C ports, this is our most expandable relay controller we have ever manufactured. Designed to work with all MCP23008 and MCP23017 I2C Relay Controllers, ProXR Enterprise adds powerful commands for turning relays on or off, toggling the state of relays, pulsing relays, and controlling relays in groups.  ProXR Enterprise also offers powerful relay timer capabilities to activate relays for a duration of time or to trigger different commands when timers finish their counting cycle.  Integrated Macros make it possible to send a simple command to execute a list of up to eight commands in the background.  Powerful startup functions allow you to execute commands when power is first applied to the controller in addition to complete power-up relay state control.  Integrated Non-Volatile FRAM memory allows unlimited read/write capabilities without memory degradation and no battery backup required.  FRAM memory keeps track of relay status, timers, macros, and many important system settings.  New Relay Counters control relays in patterns using Counter Increase and Decrease functions.  Relay Counters can be used for efficient lighting control, emergency lighting, or signage applications.  Automatic and Manual Relay Refresh Modes allow you to send relay control commands without affecting relays.  When you ready, simply send a refresh command and refresh every relay connected to the controller.

The Best I2C Converter with Eight Hardware nodeLynk I2C Ports

With 8 on-board nodeLynk I2C Ports and up to 2 Amps Shared Among All Ports, the converter offers a powerhouse of expansion options.  Connect Relays, GPIO, Gas Sensors, Temperature Humidity Sensors, Thermocouples, and 4-20mA current loop input output controllers.  Expand anytime to include voltage detection, current monitoring, programmable FET control, pulse width modulation, and much more.  The dual port adapter offers more expansion and compatibility than previous generation controllers.  As a serial to I2C adapter, this device is future proof and ready to talk to the next generation of sensors and controllers without the need for firmware updates.  Simply update your software to talk to the latest generation of I2C devices.

KeyFob I2C Converter

So why would we combine a KeyFob and I2C Converter? Integrated into all endNode series controllers is the ability to trigger macros.  Macros consist of a list of commands that may be executed in succession.  Macros can be triggered by a computer through a USB, Ethernet, WiFi, Bluetooth or other kinds of interface.  In addition to triggering macros from a computer, macros may also be triggered from a remote control KeyFob up to 700 feet away when using a 8-button KeyFob.  Each button may trigger up to two macros.  One macro may be executed when a button is pressed, a different macro may be triggered when a button is released.  So a 8 button KeyFob can trigger up to 16 macros remotely.

KeyFob Macro Configuration

KeyFob Macro Configuration Screen in Alpha Station Let’s you Edit Each KeyFob Button Press and Release Command.  Up to 8 Commands can be triggered from a Single Button Press.  Up to 8 Commands can be triggered from a Single Button Release, for a total of 16 commands per button.  Macros can also trigger other Macros for larger command structures.

Macros add complex functionality, and may include the ability to control relays by turning them on or off, or triggering relay timers that activate relays for preset periods of time.  In addition, relay counters may be used to control relays in sequence with each KeyFob button press.  Other relay control events such as relay toggle functions, pulsing functions, or delay operations may also be triggered by Macros.  Macros add simple automation events for sending custom I2C commands to any available I2C port or for sending high-level ProXR relay control commands. Available with 1, 2, 3, 4, or 5 button KeyFobs with a 200 foot maximum range or with 8 Button KeyFobs with a 700 foot maximum range.  KeyFob communications supports pairing with security encryption.  Up to 40 KeyFobs may be securely paired with this device with each KeyFob having identical functionality.  While it is not possible for each KeyFob to have a different function, it is possible to use 1 to 5 button KeyFobs for basic operational control and 8-button KeyFobs to activate special features for advanced users.


Use the Command Builder to Generate Commands using a Point and Click Interface.


KeyFob I2C Converter with Two Digi XBee® Compatible Communications Ports for Wireless Communications

New Wireless Protocols for Long Range Wireless Communications up to 2 Miles are now supported in native API communications structure.  Send commands to this nodeLynk KeyFob I2C converter from a wireless modem and command responses will be sent back to the modem.  This nodeLynk KeyFob I2C converter supports the use of multiple wireless modems, as all responses are coded to return to the origin.  Supports Select Digi 900MHz, 868MHz, and 2.4GHz Communications Options for worldwide compatibility with the best possible range legally allowed.

USB to I2C Conversion

Convert USB to I2C by loading a USB interface into a communications socket.  The USB communications module will mount as a Virtual COM Port on your PC for communications using simple serial commands at 115.2K Baud.

RS-232 to I2C Conversion

Convert RS-232 to I2C by loading a RS-232 interface into a communications socket.  This nodeLynk KeyFob I2C converter will convert RS-232 to I2C, allowing the use of simple serial commands at 115.2K Baud.  Connect to desktop computers or embedded systems to greatly simplify communications to I2C devices.

RS-485 to I2C Conversion

Convert RS-485 to I2C by loading a RS-485 interface into a communications socket.  This nodeLynk KeyFob I2C converter will convert RS-485 to I2C, allowing the use of simple serial communications to talk to a multi-drop RS-485 network of KeyFob I2C Converters.

Bluetooth to I2C Conversion

Bluetooth to I2C Conversion requires the use of the WiFi option during checkout, users may choose to use the WiFi, Bluetooth, or USB communications technologies by using a single WiFi module that integrates all three technologies into a single communications module.

Ethernet and WiFi to I2C Conversion

Network communications could not be any easier.  Simply associate this device with your network using WiFi (2.4GHz Only) or a Ethernet cable connected directly to your router, open TCP socket 2101 and start sending and receiving TCP data.  Both Ethernet and WiFi options support DHCP, Programmable TCP Port, and a Programmable Static IP address.  Both communication options also support web page configuration of communication technologies.  The WiFi Option Supports WiFi TCP/IP and WiFi MQTT Communications.

MQTT Over WiFi

Our nodeLynk KeyFob I2C Converter becomes a internet controlled device when using the WiFi option.  Paired with our new WiFi communications module, the MQTT communications option may be used, allowing this device to talk directly to MQTT servers using a single publish and subscribe topic used for transporting low-level I2C messages.  This effectively allows any command to be executed via MQTT communications for remote operation from anywhere in the world.

I2C Converter Re-Engineered

This device acts has a hardware dual port serial to master hardware I2C protocol converter designed to communication with NCD nodeLynk I2C node devices.  I2C Master controllers initiate communications to node devices such as ADC, DACs, Potentiometers, PWM controllers, GPIO controllers, and a wide variety of sensors.  I2C node devices are always speak when spoken to, they do NOT initiate communications with a master I2C controller.  Conversion works by sending a single hardware I2C port selection along with a I2C start address as well as any associated parameters, as well the number of bytes you would like to request from the I2C device.  The KeyFob I2C converter will exchange all data and report the response from the I2C device via a serial format.  The term “hardware” is used to indicate that dedicated hardware is used for all serial and I2C communications.  This device does NOT use a virtual serial ports or I2C ports which would greatly limit communications speed.  Instead, this device uses dedicated hardware peripherals for all communications to greatly enhance speed and reliability of communications.  The term “master” is used to indicate this device will initiate communications with a node.  It is not possible for a node to initiate communications with a master, as this is not supported in the I2C protocol.

This device now includes more powerful commands that execute faster than previous generation controllers including I2C Bus Scan, used to displays all devices connected to a nodeLynk I2C port.  New KeyFob I2C converter commands for I2C Write, I2C Read, and I2C Write/Read operations, which are now executed using hardware I2C ports rather than software emulated ports found in previous generation controllers.  The new hardware I2C ports offer I2C Bus Speeds up to 700KHz per nodeLynk I2C Port.  I2C Port Switching and Communications is now executed as a single command, offering incredible speed for switching ports and executing read/write operations with a single transaction.

New I2C Software for Windows

nodeLynk Master Adapter

This is a nodeLynk Master adapter.  nodeLynk Master adapters speak to a chain of nodeLynk devices using I2C communications.

What is nodeLynk?

Chain expansion devices using nodeLynk. Connect a wide variety of accessories to expand the capabilities of a nodeLynk compatible controller.  Use nodeLynk to add Relay Controllers, Sensors, PWM Drivers, Displays, and a wide variety of 4-20mA, 0-10V ADCs and DACs, as well as a wide array of TTL & Isolated GPIO devices.  All nodeLynk devices use I2C communications to chain devices together.  nodeLynk is an easy way to expand functionality without soldering.  nodeLynk allows expansion in seconds so you can focus on your software and firmware development.

Designed with Visual Studio in Mind

The NCD WiFi to KeyFob I2C Converter is a perfect companion to add automation, sensing, monitoring, and control features to Visual Studio applications.  We are always improving our Alpha Station Software framework, which includes all libraries needed to communicate to every kind of I2C sensor and controller imaginable.  Simple libraries for I2C Read, Write, and Write Read operations make it easy to talk to all kinds of hardware with minimal time investment.  Talk to displays, sensors, multiplexers, relay controllers, pulse width modulators, and more.  The Alpha Station framework is ready to go to work monitoring and controlling using Visual Studio Community Edition (free from

Control LCD Displays with Visual Studio

Control PCF8574 Display Visual Studio
Control PCF8574 Display Visual Studio

Alpha Station provides you with a working sample framework, take a look at the source code to see how easy it is to control this display:

LCD Control Visual Studio Source Code

Read MAX1069 Analog to Digital Converters with Visual Studio

Alpha Station gives you the tools you need to quickly read and display Analog to Digital Values such as the MAX1069 connected to a 8-Channel Multiplexer to display the result.  Reading and Displaying ADC Values could not get any easier.  Notice how we use the I2C Write Read Command to talk to the MAX1069 with a start address of &H37, this command handles all the low-level I2C communications to the chip, you simply specify the start address, number of bytes you would like to read (2), and the delay (0) between the Write and Read operation.  When the chip returns a response, it should be 2 bytes in Length.  The response is then converted to a 14-Bit value using the NCDLib.Math.MSLBLS14 command.  The value can then be displayed directly to the console.

MAX1069 Visual Studio
MAX1069 Visual Studio

Control a AS1115 LED Display with Visual Studio

Alpha Station Libraries make it easy to control hardware.  The AS1115 Library is used to communicate numeric values directly to a LED display.  Values from 0 to 999 are supported as well as brightness levels of 0 to 15.  Simple library calls are all it takes to setup a dedicated hardware numeric display.

XBee® is a registered trademark of Digi International.



900HP-S3B Wireless Compatibility Notes

Notice: Compatibility Notes Does NOT Apply to the Following Products:

  • NCD Enterprise Solutions
  • NCD Wireless Sensors
  • NCD Enterprise Modems and Gateways

Notice: Compatibility Notes Applies to NCD Industrial Products, Including Fusion, ProXR, ProXR Lite, Taralist, and Reactor Series Products.

Compatibility Notes

When using an 900HP-S3B communication module, it is essential that you use the ZIGMO_PCB to configure the module settings.  Long-Range wireless sensors may be programmed over the air without removing the communications module.

A 900HP-S3B Modem or a gateway of some kind that support the 900HP-S3B communications module will also be required.

Ethernet TCP/IP Compatibility Notes

This device periodically sends UDP Packets on port 13,000, which help identify the IP address of this device on your network.

RS-232 Serial Compatibility Notes

The NCD RS-232 Serial communications module is compatible with standard RS-232 signals (+/-10VDC), which are not directly compatible with UART signals from a microprocessor.  If you are working with Arduino, Microchip PIC, or other common microcontroller, a communications module is not required.   Microcontrollers will directly talk to the on-board processor of all NCD controllers.

RS-485 Serial Compatibility Notes

The NCD RS-485 Serial communications module is compatible with NCD ProXR, ProXR Lite, Fusion, and Taralist series controllers.  This module was designed to work with NCD devices, but may be used with devices outside the NCD family.  This device acts as a transparent RS-485 to USART serial converter.  Non-NCD products will require a software networking protocol to support multiple devices.


Documentation Downloads


Mechanical Drawing

Wiring Diagrams

Click to Enlarge

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Product Identification
SKU: PR54-19
UPC: 689860072787
Country of Origin: US
HTS Code: 854231
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endNodes Port 1 Communication OptionsChange

Please choose a communications technology for Port 1.

endNodes Port 2 Communication OptionsChange

Please choose a communications technology for Port 2.

Key Fob Recommended AccessoriesChange

Would you like a power supply?Change

NCD Controllers Need Power. Standard NCD Power Supplies use a 2.1mm Barrel Connector with 12VDC (center positive) rated at 1.25 Amps (minimum).


We Customize Just for You!!

NCD offers many custom IoT electronic design services to help tailor our product to your exact needs.  Whether you are looking for custom firmware, circuit board modifications, metal enclosures, or industrial color printing, we can help you with a wide variety of design services.

Custom IoT Electronic Design Services Process

Most of our users purchase off-the-shelf hardware for initial testing.  Once everything is working, they contact us to build a custom solution which may include specialized changes to the board, firmware, connectors, etc.  Custom boards have many advantages such as reduced wiring, easy installation, small size, less power consumption, and in some cases, an overall reduction in product cost.  Custom IoT Electronic Design Services will have your company name and logo on the board as well as the enclosure.

Customized IoT Electronics

NCD engineers can help build a customized solution for your particular application based on the designs you see on our website.  We can combine devices onto a single board, change the shape, or even some of the components to meet your exact needs.  We also provide turn-key metal enclosures with powder coating and full-color printing on the top side starting at just $500 for setup!  We have more than 20 years of experience in electronics design and manufacturing.  All of our products are designed and manufactured in the USA, so we are here to support the products we make.  We only ask that our customers prototype their needs using our existing products before we customize.

Customization Guidelines

  • Custom designs should be based on our existing product because we can’t build rockets or electric cars over here!
  • We do not provide customization services if it involves the introduction of a new or untested technology.
  • Custom engineering fees depend on your requirements, so please contact us for a quote!
  • We maintain ownership of all designs, including our customized designs as they are based on our existing Design.
  • We will only ship the customized product to you or your authorized agents.
  • We have an NDA available if needed.
  • The turn-around time is about 2-3 weeks.
  • We specialize in low-volume designs, no quantity is too small!
  • We have the ability to scale to large volumes as needed.

Getting Started with Product Customization

All you have to do is contact us and we will walk you through the process from beginning to end, based on your individual needs.  Some people are surprised at how fast we finish CAD design (usually a few hours), but keep in mind, we still have to build your design, which takes considerably more time.  When we customize product, here are the general services we provide:

  • We design the circuit board.
  • We communicate with our customers throughout the customization and manufacturing process.
  • We manufacture surface mount stencils and circuit boards.
  • We program our pick and place machines to build your boards.
  • We build a working sample and run it through our wave solder machine.
  • We test your custom IoT solution.
  • Once the design is finalized it won’t be possible to make changes during production (changes cost money and require us to repeat the above processes)
  • Once it meets all your requirements, we will start production as needed.
  • We work with our metal fabricators to design a metal enclosure if required.
  • You work with our artist to print the top side of the enclosure in full color with your company logo if required.

+MORE App customizations

We partnered with Blynk who have developed the +MORE app.  If you are interested in customization to their +MORE app then we're sure you will enjoy working with them as much as we did.  They can customize the user interface +MORE mobile app at your request.

  • Add new functionality and features to the mobile applications and web dashboard
  • Change/ add data visualizations options

Contact them today for custom App Development!

White-labeled mobile apps and dashboard

Blynk the developer of +MORE has a fantastic team of developers eager to help with your IoT applications.  They offer the following services.

We provide white-label IoT infrastructure:

  • Private IoT cloud
  • Branded mobile applications for remote monitoring and control
  • A branded web dashboard to manage fleet of your devices
  • Big Data analysis with actionable insights
  • Development of machine learning algorithms

Contact them today for all of your IoT cloud needs!

©2021 National Control Devices, LLC

Made in the USA
5 Year Warranty
Free Shipping on orders over $100
Free Shipping on orders over $100

To learn something new, take the path that you took yesterday. ~John Burroughs

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