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jCOM1939 Monitor - Download

jcom1939-monitor-main-screen.jpgThe jCOM1939 Monitor Software is the perfect tool to monitor, analyze, and simulate SAE J1939 data traffic. The system combines our jCOM.J1939.USB that functions as an SAE J1939 to USB (or UART) gateway. A 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.

  • 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
  • Scan a J1939 Network (Number of Nodes, Node IDs, NAMEs)
  • Check Gateway Status (Error Messages, Software/Hardware Version)
  • Set Gateway Parameters (Heartbeat Frequency, Message Acknowledgment)
  • Free Updates

Note: The jCOM1939 Monitor will only work with our jCOM.J1939.USB hardware. It is not fit to work with any other hardware by any other manufacturer.

jCOM1939 Monitor - Check Your Current Version

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

jCOM1939 Monitor - Version Number

If your version is older than the one as documented in the gateway product description (bottom of the page), we strongly recommend to download and install the newest version as indicated below.

jCOM1939 Monitor - Download

The jCOM1939 Monitor for Windows is a 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.

download.jpgNewest Version: V 3.20.00

After downloading the installation program, run the .exe program and follow the instructions on the screen to install the program. This is a standard installation program for Windows; there are no special actions or settings necessary.

Note: When you upgrade from Version 2.x to 3.x (Pro Version), please be aware that the 2.x version will not be replaced. Consequently, you need to uninstall the 2.x version manually. The 3.x version contains some fundamentally different control modules that are not compatible with the 2.x version, thus we had to create a separate program.

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).

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.