What is ISO 11898?

ISO 11898, also known as "CAN" or "Controller Area Network," is a widely used communication protocol in the automotive and industrial sectors. It provides a robust and reliable method for transmitting data between electronic devices in a network. In this article, we will explore the basics of ISO 11898 and how it works.

The Basic Principles of ISO 11898

ISO 11898 is based on a two-wire twisted pair cable, where one wire carries the high voltage level (dominant) and the other carries the low voltage level (recessive). This differential signaling allows for noise-free transmission and ensures data integrity. The protocol uses a non-return to zero (NRZ) bit encoding scheme, meaning that a dominant state is represented by a low voltage level, while a recessive state is represented by a high voltage level.

ISO 11898 Communication Layers

ISO 11898 is divided into seven communication layers, each with its own specific functions and responsibilities. These layers provide a structured framework for organizing the communication process. Let's briefly go through each layer:

1. Physical Layer: Handles the electrical and physical aspects of the communication, such as voltage levels and cable characteristics.

2. Data Link Layer: Responsible for error detection and correction, ensuring data integrity during transmission.

3. Network Layer: Manages network addresses and enables routing of messages between devices.

4. Transport Layer: Controls the segmentation and reassembly of larger messages into smaller data frames for transmission.

5. Session Layer: Provides synchronization and connection management services between devices.

6. Presentation Layer: Handles data formatting and conversion, ensuring compatibility between different devices.

7. Application Layer: Defines the specific protocols and services used by application software to exchange information between devices.

Applications of ISO 11898

ISO 11898 has found wide applications in various industries, with automotive being one of its primary uses. It is utilized for communication between various electronic control units (ECUs) in a vehicle, facilitating functions such as engine control, transmission control, and anti-lock braking systems. In addition to automotive, ISO 11898 is also employed in industrial automation, building automation, medical equipment, and other fields where reliable and efficient communication is crucial.

In conclusion, ISO 11898 is a widely adopted communication protocol that allows for robust and reliable data transmission in automotive and industrial environments. Its use of differential signaling and layered architecture ensures noise-free communication and data integrity. With its broad range of applications, ISO 11898 plays a vital role in enabling seamless connectivity and control in modern electronic systems.