
LonMark provides a comprehensive suite of development resources for the ISO/IEC 14908 standard series.
In the sections below, you will find a variety of tools and solutions designed to support product development, testing, and certification. These resources are intended to assist developers at every stageāfrom initial concept and design to deployment and complianceāensuring efficient and standards-based integration within interoperable control networks.
The currently available development solutions include:
The Babi-LON⢠platform offers the most scalable development environment for your IoT applications. It is available under Linux and RTOS. It is the most open solution as it is ISO 14908 (LON) and ISO 16484 (BACnet) compliant.
It does not use a single specific component for long-term sustainability. Compared to the discontinued NeuronĀ® Chip, the Babi- LON platform gives you the resources, scalability and sustainability you need to guarantee the long-term life of your products.
Small footprints with low costs under RTOS or powerful applications under Linux – the choice is yours. AI is supported for all hardware architectures. Media support including the user-friendly and robust Free Topology structure and Powerline provides complete IP networks with simple cabling.
More information is available at: https://www.babi-lon.com/en/babi-lon/
FetLON Stack is a reliable and versatile solution for the LONĀ® protocol.Ā Using a patented solution for decoding the Differential Manchester encoded LONĀ® messages, it enables the processing of the LONĀ® protocol on commercially available microcontrollers.
With its minimum operating system requirements and its scalable design it is adaptable to different operating systems (including Zephyr, FreeRTOS or Bare Metal environments) as well asĀ to different storage types and storage sizes.
Its small footprint and low performance demands on processors allow for single-chip solutions for typical LONĀ® devices. Two-chip solutions are also possible for applications with higher computing power requirements.
More information is available at https://who-ing.de/en/fetlon-stack_en/
The BV2021-8 is a Communications Transformer compatible with LonWorksĀ® Free Topology and Link Power networks using the ISO/IEC 14908.1 (ANSI/CTA 709.1 D or EN 14908.1) Control Network Protocol.
Originally, the BV2021-8 was designed to be used with the EchelonĀ® FT 5000Ā® Smart Transceiver. It can be used as a replacement for the FT-X3Ā® Communications Transformer. It is also part of the bus-coupling circuit for LONĀ® devices that incorporate the FetLON Stack.
The BV2021-8 has been designed and tested according to the EchelonĀ® compatibility specification.
More information is available at: https://who-ing.de/en/bv2021-8_en/
The LON Stack DX enables Industrial IoT developers to build networks of communicating devices using any processor supporting the C programming language. Devices with the LON Stack DX can exchange data with each other on an easy-to-use publish-subscribe data model over IP or native LON channels. LON devices can collect data from physical sensors built to monitor the built environment including temperature, humidity, light-level, power-consumption, or moisture, and make the data available to other LON devices in the same network. Using data received from other LON devices or local sensors, LON devices can also control physical actuators such as LED dimmers, motor controllers, damper controllers, and solenoids. The LON protocol is an open standard defined by the ISO/IEC 14908 series of standards.

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Nessum technology, standardized under ANSI/CTA 709.8 and EN 14908-8, delivers a high-speed LON channel with international recognition. It is based on the IEEE 1901 standard, specifically the latest IEEE 1901c specification. Nessum ensures outstanding network performance and state-of-the-art security.
It supports multiple physical layers, including power line and twisted pair. On twisted pair, Nessum can operate in parallelāwithout interferenceāwith LON TP/FT10 or BACnet MS/TP over RS485.
The required LON stack, such as EnOceanās DX, can run either directly on the Nessum microcontroller or on a separate chip using the Nessum controller as a PHY. Multiple vendors supply Nessum-compatible silicon.
Nessum-based LON designs have been successfully deployed in smart streetlighting and building automation projects. Visit and register at nessum.org to explore all the features.
For detailed specifications, application examples and services, compatible LSIs, modules, products, and information about participating companies, please visit the Nessum Alliance website.
For any other inquiries, feel free to contact the Nessum office:
Nessum Alliance
š§ Email: info@nessum.org
š Website: https://nessum.org
š LinkedIn: https://www.linkedin.com/company/nessum-alliance/
Engenuity Systems ā 30+ Years of LonWorks Expertise
Engenuity Systems has been a trusted leader in the LonWorks community for over 30 years. As one ofĀ Echelonās original approved LonWorks Independent Developers, we have deep expertise in designing, deploying, and supporting LON-based products across building automation, industrial control, and energy management.
Today, we continue to innovate by designing and redesigning LonWorks products using the latestĀ open-source LonTalk stack implementationsĀ and development tools.Ā Our team is experienced in:
As active contributors and leaders within the LonMark community, we are committed to helping OEMs, integrators, and end users evolve their LonWorks product lines and systems by providing and ensuring long-term support for this proven, open, and interoperable technology.
For more information:Ā https://engenuity.com/engineering-services/
who Ingenieurgesellschaft mbH ā Your Development Partner
who is your development partner for customized system solutions. We were established in 1995 and from the beginning we used LonWorks technology to provide state-of-the-art solutions to our customers. In the past 30 years we have grown to more than 50 employees, the greater part of them being engineers. As we expanded our business to the development in the sectors of building automation, industrial automation and medical technology, we also broadened the expertise of our employees.
Today we provide consulting and engineering services for all phases of the product life-cycle, starting with planning, through development of hardware and software, verification, technical documentation to product-lifecycle-management support.
Our certified systems for Quality Management (ISO 9001) and Information Security Management (ISO 27001) help us to maintain quality and protect your and our intellectual property. We have an IEC 62443-1 certified development process, so we can create solutions that are resilient to today’s cyber security threats.
We are proud to look back on well over 500 successfully completed projects and a lot of satisfied customers. And we would be happy to add you to our list of satisfied customers.
For more information, please visit our website and feel free to contact us directly:
Email: projects@who-ing.de
Website: https://who-ing.de
Linked-In: https://www.linkedin.com/company/who-ingenieurgesellschaft-mbh/
| Matrix | Babi-LON | FetLON | LON Stack DX | LON Stack EX |
|---|---|---|---|---|
| Network Variables | 4096 | 4096 | 254 | 4096 |
| Aliases | 1024 | 1024 | TBD | 8192 |
| Address Table Entries | 1024 | 4096 | TBD | 4096 |
| Supported Channels | TP/FT-10, PL-20 TP-RS485-78 IP-10, IP-70 | TP/FT-10, TP/XF-78, TP/XF-1250 and TP-RS485-xx | Any IP channel including 10BASE-T, 10BASE-T1L,and Wi-Fi TP-RS485-xx | Any IP channel including 10BASE-T, 10BASE-T1L,and Wi-Fi TP-RS485-xx |
| Supported Transceivers | Generic components | BV2021-8 (equivalent to FT-X3) RS-485 | Any Ethernet, Wi-Fi, or RS-485 transceiver | Any Ethernet, Wi-Fi, or RS-485 transceiver |
| Programming Language | C++ | C | C | C++ |
| Development Tools | Tool to generate XIF and C++ Classes from DRF to support formats in development in FreeRTOS framework | Open source platform-independent tools such as VS Code and Vendor-specific IDEs | Open source platform-independent tools such as VS Code with PlatformIO, and vendor-specific IDEs | Open source platform-independent tools such as VS Code with PlatformIO, and vendor-specific IDEs |
| Compiler | Gnu C++ | GCC or platform-specific | GCC or platform-specific | GCC or platform-specific |
| Hardware based on | Arm Cortex-M | Hardware-independent | Hardware-independent | Hardware-independent |
| Firmware and application updates | Download Application over LON media with certificate approval to be compliant with CRA (Cyber Resilience Act) | Custom solution | Custom solution | Custom solution |
| Supports SNVT, UNVT, SCPT,UCPT, SFPT, UFPT | Yes | Yes, with manual declarations | Yes, with manual declarations | Yes, with manual declarations |
| Supports Application, Network Management, and Network Diagnostic Messages | Yes, without any limitation incl. auto installation | Yes | Yes | Yes |
| Security | LON authentication, Certificate for environment and application | Authentication custom solution possible | Custom code for authentication possible | Custom code for authentication possible |
| Multiple Simultaneous Transactions | Multiple (scalable) | 2 (one priority and one non-priority) | Multiple with configurable limit | |
| Operating System | FreeRTOS, Linux | Independent runs on bare metal, Zephyr, FreeRTOS | Independent with minimal required operating system services | Independent with minimal required operating system services |
| License | Access Fee and Runtime Fee | Runtime License or Source Buyout | MIT license | MIT license |
| Evaluation Kit | September 2025 | Yes | GitHub repository | GitHub repository |
| LON/IP (aka IzoT) Support | LON/IP (aka IzoT) Support over native LON media (UDP/IP) | Yes | Yes | |
| BACnet/IP | BACnet/IP over native LON media | Co-exists with BACnet/IP stacks on the same host providing support for both LON/IP and BACnet/IP | Co-exists with BACnet/IP stacks on the same host providing support for both LON/IP and BACnet/IP |