CAN Bus – Unlocking the Power of CAN with Axiomatic Technologies

The Controller Area Network (CAN) protocol provides communication in vehicle and engine systems, providing an efficient and reliable way for independent controllers to communicate over a two-wire or three-wire bus. Its robust design and adaptability have made it a cornerstone in industries ranging from automotive, heavy-duty trucks, off-highway, agriculture, and power generator sets to marine and industrial automation robotics. Over the years, advancements like CAN FD (Flexible Data Rate) and CAN XL have extended its capabilities, offering faster data rates and larger payloads to meet modern demands. Axiomatic leverages the full potential of this protocol, delivering versatile, field-proven CAN solutions for a broad spectrum of applications.

CAN Protocols: The Backbone of Efficient Communication

At the heart of Axiomatic’s product offerings is the support for the CAN 2.0B physical layer, a standard that ensures reliable communication across devices. While many organizations work within the confines of specific protocols, Axiomatic offers controls with either SAE J1939 and CiA CANopen®, two of the most widely used high-level communication standards for CAN. These protocols provide the necessary structure for varying speeds of communication, and Axiomatic’s expertise ensures that their implementation is both efficient and reliable. Furthermore, Axiomatic products offer the flexibility to integrate other fieldbus protocols such as Ethernet and Automotive Ethernet, making it possible to cater to machine subsystem applications with specific networking requirements.

What are the key differences among Classic CAN, CAN FD, and CAN XL?

The evolution of the Controller Area Network (CAN) protocol has introduced significant enhancements in performance and flexibility through its newer iterations: CAN FD and CAN XL. Each version builds upon the foundation of Classic CAN, addressing specific limitations to meet the growing demands of modern applications. Here’s a detailed breakdown:

Classic CAN (CAN 2.0)

• Introduction: Classic CAN was introduced in the 1980s and quickly became a standard for robust communication in automotive and industrial systems.
• Data Rate: Supports data rates of up to 1 Mbit/s, which is sufficient for many embedded applications.
• Data Payload: Limited to 8 bytes per frame, which constrains its ability to handle larger or more complex messages.
• Applications: Still widely used in automotive, off-highway, heavy-duty trucks, diesel engine power generator sets, industrial automation, and other control systems where moderate data rates and payload sizes are sufficient.
• Limitations: As data needs grew, Classic CAN’s limited payload size and speed became a limitation, prompting the development of enhanced versions.

CAN FD (Flexible Data Rate)

• Introduction: Introduced in 2012, CAN FD is an extension of Classic CAN designed to address its limitations in data rate and payload capacity.
• Data Rate: Allows for flexible data rates, with speeds significantly higher than Classic CAN (up to 8 Mbit/s in the data phase).
• Data Payload: Supports payload sizes of up to 64 bytes per frame, enabling more efficient communication for data-intensive applications.
• Backward Compatibility: CAN FD nodes can coexist on the same network as Classic CAN nodes, but CAN FD communication occurs only between CAN FD-compatible nodes.
• Applications: Ideal for automotive, off-highway, agriculture equipment and heavy-duty trucks all having systems with higher data requirements, where large amounts of data need to be transmitted quickly between various electronic control units (ECUs) within the vehicle, telematics are utilized and in advanced driver-assistance systems (ADAS), and for industrial applications needing more efficient data exchange.
• Advantages: Reduces busload and increases efficiency by transmitting more data per frame and supporting higher speeds.

CAN XL (Extended Data-Field Length)

• Introduction: CAN XL is the newest iteration, designed for applications requiring even greater data capacity and speed.
• Data Rate: Supports data rates of up to 20 Mbit/s, making it suitable for high-bandwidth applications.
• Data Payload: Increases payload capacity to a maximum of 2048 bytes per frame, far surpassing both Classic CAN and CAN FD.
• Enhanced Features: Includes a new protocol header that supports additional features like multiplexing, improving flexibility for future applications.
• Backward Compatibility: CAN XL is not directly compatible with Classic CAN or CAN FD. Separate network segments or gateways are required to integrate CAN XL with older CAN versions.
• Applications: Well-suited for applications like advanced telematics, over-the-air updates, and high-resolution sensor data in vehicles and industrial automation systems.
• Advantages: Provides the bandwidth and data handling needed for modern, data-intensive systems while maintaining the robustness of CAN.

Axiomatic’s Diverse Product Line

Axiomatic’s CAN bus modules are designed to meet the needs of OEMs and end-users alike. The company offers off-the-shelf products preloaded with embedded firmware for standard applications, ensuring rapid deployment in industries like mining, construction equipment, power generator sets, marine, and material handling. For more specialized needs, Axiomatic provides flexible modules, allowing OEMs to tailor hardware and software to their exact specifications. Whether for a new product line or a specific application, Axiomatic’s solutions are built to perform in even the most challenging environments.

The ability to modify embedded firmware quickly is a hallmark of Axiomatic’s engineering capabilities. This ensures that products can adapt to the evolving needs of OEMs, reducing time to market and ensuring that end-users receive solutions perfectly suited to their operational challenges. Robust circuits and rugged packaging further enhance reliability, making Axiomatic’s CAN products ideal for harsh conditions such as high or low temperatures, high vibration, and exposure to moisture and dust.

Expanding Applications of CAN

The versatility of CAN technology is reflected in its widespread adoption across a variety of industries. Axiomatic’s controllers have been successfully implemented in applications including:

• Commercial Vehicles: Managing advanced vehicle systems for improved safety and performance.
• Construction and Mining Equipment: Providing reliable communication in heavy-duty machinery operating in rugged environments.
• Marine Applications: Supporting control systems in harsh marine environments where reliability is critical.
• Military and Defense: Delivering ruggedized solutions for armored vehicles.
• Material Handling and Robotics: Enabling precise control and automation for industrial equipment.

Other applications include electric utility vehicles, power generation systems, rail, and even first response vehicles, where failure is not an option. By delivering adaptable, reliable solutions, Axiomatic ensures its products meet the unique challenges of these industries.

High-Level Protocol Expertise

In addition to its hardware capabilities, Axiomatic brings deep knowledge of high-level protocols to the table. The use of SAE J1939 and CAN in Automation (CiA) CANopen® allows for standardized communication in industries like automotive and industrial automation. For example, SAE J1939 is widely used in heavy-duty vehicles, enabling communication between engines, transmissions, and other subsystems. CiA CANopen®, on the other hand, provides a robust application layer for automation and control systems. This dual expertise positions Axiomatic as a trusted partner for a range of high-performance applications.

CAN Bus Customization for OEM Success

One of Axiomatic’s defining strengths is its ability to provide tailored solutions for OEMs. By working closely with clients, Axiomatic ensures that its CAN modules integrate seamlessly into larger systems, meeting specific performance criteria. Customization extends to both hardware and software, allowing clients to specify everything from communication protocols to environmental ruggedness. This adaptability not only enhances performance but also simplifies system design and reduces overall project complexity.

Reliability in Harsh Environments

All Axiomatic CAN products are built with durability in mind, using robust circuits and rugged enclosures. Whether operating in -40 degrees C or +85 degrees C (or +125 degrees C) temperatures, exposed to high vibration, or subjected to moisture and dust, these devices deliver reliable performance. This makes Axiomatic solutions a trusted choice for industries like construction, marine, and military, where environmental conditions are a constant challenge.

Enhancing Efficiency Through Embedded Expertise

Axiomatic’s embedded firmware capabilities set it apart in the marketplace. By providing off-the-shelf solutions that can be easily modified, Axiomatic reduces time-to-market and ensures that complex control requirements can be met efficiently. OEMs benefit from the ability to deploy proven solutions with their factory settings while still having the flexibility to make adjustments as needs evolve.

Seamless Integration and Future-Ready Solutions

As the CAN ecosystem continues to evolve with advancements like CAN FD and CAN XL, Axiomatic delivers solutions that are not only compatible with current standards but also ready for future innovations. This future-proof approach ensures that clients can adopt cutting-edge technology without worrying about obsolescence or compatibility issues.

Industry Expertise and Commitment

Axiomatic’s deep industry knowledge and commitment to innovation make it a trusted partner across industries. By combining technical expertise with a customer-centric approach, Axiomatic ensures that every solution is designed to meet the unique demands of its application. Whether it’s enhancing safety in off-highway vehicles or enabling precision in automation devices, Axiomatic products deliver measurable value.

Why Choose Axiomatic For CAN Bus solutions?

Choosing Axiomatic means choosing a partner dedicated to reliability, adaptability, and performance. From its robust product lineup to its extensive protocol expertise, Axiomatic provides the tools and support necessary to succeed in today’s competitive markets. Whether you need a ready-to-use solution or a fully customized design, Axiomatic has the resources and experience to meet your needs.

With a strong track record of success across diverse industries, Axiomatic continues to utilize CAN technology. Let Axiomatic’s expertise power your next project and experience the difference of working with a team that truly understands the potential of CAN.

Note: CANopen® is a registered trademark of CAN in Automation e.V.