Getting familiarized with the SAE J1939 protocol can be a daunting task. In this section, we attempt to share as much information as possible to support the newcomer as well as the experienced engineer.
SAE J1939 Network Management vs CANopen Network Management
Network management refers to the set of services and protocols that supervise the nodes (devices) on a CAN-based network – handling tasks like node addressing, status monitoring, and controlling node ...
Understanding the SAE J1939 Application Layer – What It Is, What It Does, and How Engineers Use It
When people talk about SAE J1939, they often jump straight to CAN frames, PGNs, or diagnostic trouble codes. But all of those live downstream from the most important part of ...
Why a Ground Connection Matters on a CAN Bus (And How to Wire It Correctly)
When working with the Controller Area Network (CAN) bus—whether in automotive, industrial automation, robotics, or embedded systems—you’ll quickly notice that most CAN connectors include a ground pin. At first, this ...
Understanding SPNs and FMIs in J1939: A Simple Guide for Beginners
If you’re learning SAE J1939, you’ll quickly run into two acronyms that show up everywhere—in diagnostic messages, simulation tools, engine logs, and OEM documentation: SPN (Suspect Parameter Number) FMI (Failure ...
Understanding DM1 & DM2 Messages in J1939: A Beginner-Friendly Guide
If you’re new to SAE J1939, one of the first things you’ll encounter is how heavy-duty vehicles report problems. They do this using standardized diagnostic messages, and the two most ...
SAE J1939 250k/500k Baud Rate Converter with Silent Mode Support – A Game-Changer for Modern and Legacy Vehicle Integration
A recent internal market study by Copperhill Technologies uncovered a surprising but critical shortcoming across all commercially available SAE J1939 baud rate converters: none of them explicitly address the issue ...
SAE J1939 Baud Rate Options: A Technical Comparison of 250k and 500k
SAE J1939 is a family of Controller Area Network (CAN) based standards used in heavy‑duty vehicles for powertrain control and diagnostics. Historically, the standard specified a 250 kbit/s data rate, which ...
From CAN Fundamentals to SAE J1939: Network Design for Industrial and Diesel Engine Applications
Controller Area Network (CAN bus) is a widely used communication network in automotive and industrial systems. It provides a robust, real-time communication method for multiple microcontroller-based devices (nodes) to exchange ...
Troubleshooting J1939 Address Claim Issues
One of the most common questions we receive from users involves the J1939 Address Claim process when connecting our J1939 gateways to another J1939 node. Many expect the address claim ...
Arduino Due SAE J1939 Programming Kit: Complete Solution for CAN Bus Development
Looking to take your CAN-bus and SAE J1939 projects to the next level? Whether you’re building a data logger, protocol converter, or a full-blown J1939 ECU prototype, the Arduino-Due-Based SAE ...
Understanding the Difference Between J1939 and OBD-II
When it comes to vehicle diagnostics and data communication, two protocols dominate the field: SAE J1939 and OBD-II (On-Board Diagnostics, version II). At first glance, they may seem similar, since ...
Essential Tools & Troubleshooting Strategies for CAN Bus Development
Developing on the CAN Bus using higher-layer protocols—like SAE J1939, NMEA 2000, or CANopen—offers powerful features in vehicle, marine, and industrial systems. Yet this versatility comes with complexity. Whether you're ...
Essential Tools for CAN Bus Development (Including J1939, NMEA 2000, and CANopen)
Developing applications and hardware for CAN Bus (Controller Area Network) can range from hobbyist projects to professional-grade industrial systems. Regardless of whether you are working with protocols such as SAE ...
Fleet Management for Diesel Vehicles: Purpose, Challenges, and Essential Literature Recommendations
Fleet management plays a critical role in ensuring the efficiency, safety, and cost-effectiveness of vehicle operations, particularly in industries that rely heavily on diesel-powered trucks and equipment. The purpose of ...
Understanding CAN Silent (Listen-Only) Mode and Why J1939 Communication May Fail
When working with Controller Area Network (CAN) and higher-layer protocols like SAE J1939, one feature that often confuses users is the Silent Mode (also known as Listen-Only Mode). While simple ...
From Concept to Market: The SAE J1939 250 k / 500 k Baud Rate Converter
The SAE J1939 250 k / 500 k Baud Rate Converter by Copperhill Technologies was never intended to be a mainstream product. Its origin is rooted in a simple customer ...
SAE J1708 vs. SAE J1939: Understanding the Differences and Transition in Heavy Trucks
In the late 1980s and 1990s, heavy-duty vehicles (like diesel trucks and buses) began using electronic networks to share data among engine, transmission, brake, and other control units (ECUs). The ...
Unlock the Secrets to Mastering SAE J1939 – Your Ultimate Blueprint for Operational Excellence
SAE J1939 is a standardized communication protocol used in heavy-duty vehicles like trucks, buses, construction equipment, and agricultural machinery. It defines how electronic control units (ECUs)—such as engines, transmissions, and ...
Comparing I2C and CAN Bus Protocols in Embedded Systems
Introduction Inter-Integrated Circuit (I2C) and Controller Area Network (CAN) are two widely used communication protocols in embedded systems. Both allow microcontrollers and peripherals (like sensors or other ICs) to exchange ...
CAN Bus Topology and Network Design
Overview of CAN Protocol Fundamentals A Controller Area Network (CAN) is a robust serial communication protocol originally developed by Bosch for in-vehicle networking. It is a multi-master, message-based network that ...
A Comprehensible Guide to J1939 is the first work on J1939 besides the SAE J1939 standards collection. It provides profound information on the J1939 message format and network management combined with a high level of readability.
The information in this book is based on two documents of the SAE J1939 Standards Collection:
- J1939/21 – Data Link Layer
- J1939/81 – Network Management
This book is an attempt to create an enjoyable and readable J1939 reference for everybody. The information provided in this book is, besides the SAE J1939 Standards Collection, based on publicly available information such as, but not limited to web sites and printed literature as well as contributions by engineers familiar with Controller Area Network and the J1939 protocol. The information in this book, while based on the J1939 standard, is not a reproduction of any copyrighted SAE document. More Information…