A JCOM1939 Engineering Note on Error Handling, Bus Off, and Silent Mode in Two-Node CAN Networks JCOM1939.com | Copperhill Technologies | © 2026 Controller Area Network (CAN) is well known for its robustness. Arbitration prevents message collisions from corrupting data, error detection identifies damaged frames, automatic retransmission provides another opportunity…
Posts tagged as “JCOM1939”
In a recent article, JCOM1939 Monitor Update Adds CAN Bus Diagnostics and Silent Monitoring Mode, we introduced several improvements currently being prepared for the JCOM1939 Monitor software for Windows. The upcoming release adds improved CAN Bus diagnostics, including receive and transmit error counters, CAN controller status information, CAN Bus load, and…
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,…
In this post, I would like to address what is arguably the most important concept in the SAE J1939 standard: the Parameter Group Number (PGN). PGNs are the heart and soul of J1939. Every application you design, whether it transmits engine speed, requests a VIN, or reports diagnostic information, revolves…
This time, we would like to introduce Version 4.01.00. We have listened to customer feedback suggesting that it would be helpful to select a PGN within the data stream and add it to the list of filtered PGNs. Consequently, we have added a corresponding command button. Please refer to page…
Modern vehicles have electronic control units (ECUs) to manage various subsystems, such as the engine, brakes, steering, air conditioning, and infotainment. These ECUs (or simply ‘controllers’) are networked together to share information and output both measured and calculated data directly to one another. The SAE J1939 in-vehicle network is a…
The SAE J1939-22 standard addresses the issue of limited bandwidth for future data-demanding applications when using Classical CAN as the hardware layer. The proposed solution is CAN FD, which enables larger data frames and higher transmission speeds. However, the originally envisioned backward compatibility has not been achieved. The Bandwidth Issue…
The JCOM1939 Monitor Software is the perfect tool for monitoring, recording, analyzing, and simulating SAE J1939 data traffic. It works in combination with our SAE J1939 gateways. This comprehensive, easy-to-use, and easy-to-understand Windows software displays SAE J1939 data traffic. It allows network scanning, simulating an ECU (including full node address…
Things are going smoothly with our software development, and we are ready to present another update to the JCOM1939Monitor Software for Windows. This time, we would like to introduce Version 4.00.00. The jump in version number indicates a major change in how we present the PGN data. In detail: With…
