Protocols in Embedded Systems – From CAN to MQTT and Their Application Areas

In the world of embedded systems, communication protocols play a decisive role in enabling efficient and reliable data transmission between various devices. Whether in industry, automotive applications or the Internet of Things (IoT), choosing the right protocol can significantly impact a system’s performance and flexibility. In this article, we take a look at some of the most commonly used protocols in embedded systems and their specific application areas.

CAN (Controller Area Network) – The Foundation of Automotive Communication

CAN is one of the oldest and most widely used protocols in embedded systems, particularly in the automotive industry. Originally developed for in-vehicle communication, it allows efficient data transmission between control units (ECUs) within a vehicle. The high reliability and real-time capabilities of CAN make it the protocol of choice for safety-critical applications requiring rapid responses. However, CAN is also increasingly used in industrial automation and machine control due to its robustness and resistance to electromagnetic interference.

Modbus – Industry Standard in Automation

Modbus is a widely adopted communication protocol in industrial automation. It enables serial communication between various devices and is particularly significant in drive technology and process automation. Modbus is often used in SCADA (Supervisory Control and Data Acquisition) systems to monitor and control remote devices. With its simple implementation and broad support, it remains a reliable choice for industrial control systems.

Ethernet/IP – Fast and Flexible Communication in Industry

Ethernet/IP (Ethernet Industrial Protocol) is an industrial network protocol based on the Ethernet standard, optimized for real-time communication in industrial applications. It offers high bandwidth and enables the networking of devices over long distances, making it ideal for modern production plants and factories. The use of Ethernet/IP has increased in recent years, as it combines the advantages of Ethernet with the demands of industrial automation.

MQTT – Lightweight Communication for IoT

MQTT (Message Queuing Telemetry Transport) is a lightweight messaging protocol specifically designed for the Internet of Things (IoT). It excels in applications that require fast, reliable, and resource-efficient communication between devices. Due to its low bandwidth requirements and ease of implementation, MQTT is ideal for use in environments with limited resources, such as battery-powered devices or remote sensors.

The choice of the right communication protocol depends on the specific requirements of your application. While CAN remains unbeatable for automotive and safety-critical applications, Modbus is perfect for industrial controls and Ethernet/IP for networked production systems. MQTT, on the other hand, is the perfect fit for IoT and edge-computing applications where efficiency and flexibility are key. At emtrion, we provide the necessary expertise to help you find the perfect protocol for your embedded system, tailored to your needs and requirements. Contact us to learn more: https://www.emtrion.de/en/  +49 (0)7244 626 94-0 / mail@emtrion.de