This is a free download!

The JCOM1939 Monitor Software is the perfect tool to monitor, record, analyze, and simulate SAE J1939 data traffic. The system works in combination with our SAE J1939 gateways.

This comprehensive and easy-to-use, easy-to-understand Windows software displays not only SAE J1939 data traffic; it also allows to scan the network, simulate an ECU (incl. full node address negotiation features), and respond to data request messages.

The communication protocol between the gateway and the host system (PC, Embedded System, Android System, etc.) is well documented, and we provide C/C# source code to read and write CAN data frames.

• FREE download
• ECU Simulation Setup (Preferred Node Address, Negotiable Address Range, NAME, and more)
• Filter J1939 PGNs for Display
• Design J1939 PGNs for Transmission (Data and Request Messages)
• Design J1939 PGNs for Request Responses
• Simulate Digital and Analog Signals
• Scan a J1939 Network (Number of Nodes, Node IDs, NAMEs)
• Record SAE J1939 Data Traffic
• Simulate SAE J1939 Data Traffic
• Check Gateway Status (Error Messages, Software/Hardware Version)
• Set Gateway Parameters (Heartbeat Frequency, Message Acknowledgment)
• Free Updates

Our SAE J1939 gateways and the SAE J1939 Starter Kit are designed to work seamlessly with our JCOM1939 Monitor Pro software for Windows, a free download. This combination is key to ensuring the optimal performance of your purchased product and your overall satisfaction. 

To enhance communication and provide you with the best support, we have meticulously crafted a dedicated website. This website houses all the documentation you might need, including a user manual, quick-start guide, troubleshooting guide, blog posts, and further resources, all in one convenient location.

By signing up for our newsletter, you will be the first to know about the latest developments of the JCOM1939 Monitor software and new additions to the website. As a registered user, you will also gain access to a technical support forum, where you can connect with other users and share your experiences.

We are working on additional features like time stamp data, developing PGN transmission scripts for data traffic simulation, recording and replaying data traffic, support for DBC files, and more. More Information...

The JCOM1939 Monitor software works directly with the following SAE J1939 gateways:

• SAE J1939 ECU Simulator Board with USB Port...
• SAE J1939 Starter Kit and Network Simulator...
• SAE J1939 to Bluetooth Gateway...
• SAE J1939 to RS232 & USB Gateway...

Documentation

• JCOM1939 Monitor Pro - User Manual (PDF)...
• JCOM.J1939 Serial Protocol & Programming Interface (PDF)...

Development Resources

• SAE J1939 ECU Simulation And Data Monitoring Under Linux...
• SAE J1939 ECU Simulator And Data Monitor for Raspberry Pi...
• JCOM1939 Monitor – Visual Studio C# Sample Code...

Program Versions and Update

Start your version of the jCOM1939 Monitor and check the version number in the window’s caption (top bar).

If your version is older than the one as shown below, we strongly recommend to download and install the newest version.

The jCOM1939 Monitor for Windows is free software; you can redistribute it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License or (at your option) any later version. The program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. With downloading these programs, you confirm that you have read and agree with these terms and conditions.

A Comprehensible Guide to J1939

SAE J1939 has become the accepted industry standard and the vehicle network technology of choice for off-highway machines in applications such as construction, material handling, and forestry machines. J1939 is a higher-layer protocol based on Controller Area Network (CAN Bus).

It provides serial data communications between microprocessor systems (also called Electronic Control Units - ECU) in any kind of heavy-duty vehicles. The messages exchanged between these units can be data such as vehicle road speed, torque control message from the transmission to the engine, oil temperature, and many more.

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. 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.

Read More...