Fleet management has evolved far beyond simply knowing where a vehicle is located. Modern commercial vehicles continuously transmit enormous amounts of operational data through the SAE J1939 network, while GPS receivers provide precise positioning information. Together, these technologies form the foundation of telematics, enabling fleet operators to monitor vehicle performance,…
Posts published in “Misc. J1939”
Why the SAE J1939 Starter Kit Is the Best Choice for Learning and Developing Embedded J1939 Systems When engineers first enter the world of SAE J1939, they often ask a simple question: Should I start with a single J1939 gateway or buy the complete Starter Kit? While the SAE J1939…
Designing a CAN Bus device that performs well under ideal conditions is relatively straightforward. The real challenge begins when the network no longer behaves as expected. In the field, connectors loosen, ECUs lose power, messages are delayed, wiring deteriorates, and configuration errors inevitably occur. A robust CAN device must continue…
If you work with SAE J1939 long enough, there comes a point where generic CAN monitoring software is no longer enough. You need an application that is tailored to your own project, whether that means displaying proprietary parameters, automating diagnostics, logging data, testing ECUs, or integrating J1939 into a larger…
If you are serious about developing CAN or CAN FD applications, there is one tool that will save you more time, eliminate more frustration, and improve your software quality more than almost anything else: a professional CAN analyzer. Many engineers begin by connecting a microcontroller to a CAN network, sending…
A customer recently asked me a seemingly simple question: “Can I use your JCOM1939 Monitor software with my existing IXXAT CAN-to-USB interface?” Although the question was specifically about SAE J1939, the underlying issue has nothing to do with J1939. It is a problem that has existed in the CAN Bus…
Developing an SAE J1939 application has traditionally required a substantial investment—not only in hardware and engineering time, but also in software. Commercial SAE J1939 protocol stacks are often expensive, frequently licensed per device, and in many cases remain closed-source. For students, hobbyists, researchers, startups, and even experienced engineers who simply…
When the first versions of SAE J1939 emerged in the late 1980s and early 1990s, the objective was straightforward: provide a standardized communication protocol for electronic control units (ECUs) in heavy-duty trucks. At the time, vehicle manufacturers were rapidly increasing the number of electronic subsystems, creating a need for a…
If you spend enough time working with heavy-duty vehicles, agricultural equipment, construction machinery, or industrial engines, you will eventually encounter proprietary J1939 messages. At that point, many engineers ask the same question: Can I reverse engineer a J1939 network? The short answer is yes—but only to a certain extent. Before…
Modern digital dashboards are amazing. They offer colorful displays, engine diagnostics, fuel consumption data, trip information, and customizable gauges that make a 20-year-old truck feel like a brand-new vehicle. Unfortunately, many truck owners discover a frustrating reality after installation: The dashboard powers up perfectly, but no engine data appears on…
