Our SAE J1939 ECU Simulator Board With USB Port allows any host device (e.g., PC) with a USB COM port to monitor SAE J1939 data traffic and communicate with the SAE J1939 vehicle network, which makes it also suitable to simulate SAE J1939 data traffic. The simulation of SAE J1939 signals (i.e., PGNs) is a valuable tool for any situation from a product line test, incoming inspection, business demonstration to product development and product validation.

The device supports the full SAE J1939 protocol according to J1939/81 Network Management (Address Claiming) and J1939/21 Transport Protocol (TP). Also, the gateway communicates with our jCOM1939 Monitor, an SAE J1939 Monitoring, Analyzer, and ECU Simulation software under Windows.

The free-of-charge jCOM1939 Monitor Software is the perfect tool to monitor, analyze, and simulate SAE J1939 data traffic. It is 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.

Version 3.31.00

The newest version (dated February 25, 2020) adds a new tab "Settings" that allows to individually switch the display mode of PGN, Source Address (SA), Destination Address (DA), and Data between decimal and hex.

The picture above demonstrates the default settings as used in previous versions. However, the display of data has changed slightly: Decimal parameters have a "d" suffice, while hex parameters end with an "h."

The following image shows a different view, where all parameters have been switch the hex mode:

The settings, when changed, take effect immediately and are stored permanently, i.e. they are loaded every time you start the monitoring software.

We have also modified the data recording format. Previous versions did not include the PGN description after the Excel-compatible recording file (.csv) was created. SAE j1939 data recordings now look like this (example):

What's Next?

The next version (probably 3.40.00) will include the following features:

Pick PGN from data recording: 

The idea is to re-load SAE J1939 data recordings and "pick" certain PGNs for inclusion in another data simulation setup. Actually, we have been working on this for a while, but wouldn't want to release it unless it has been extensively tested.

New data display mode: 

Currently, all received and transmitted data is displayed frame by frame in the data view list. The disadvantage becomes clear with increased busload, i.e. higher data frame frequency, which makes it impossible to read with the naked eye. Yes, we do recommend PGN filtering, but that goes only so far.

Consequently, we will add a data view that uses only one row for each instance of a PGN, including a counter value, indicating the number of received/transmitted PGN. In addition, we are planning to include measured data frame frequency of received PGNs, which would be a great help when it comes to J1939 data analysis.

We will preserve the previous data display mode but are thinking of making the new mode the default. Nevertheless, the user will be able to switch between both modes.

To follow up on new program versions, please make sure you check our wiki page at:

https://copperhilltech.wiki/jcom1939-monitor-software/jcom1939-firmware-versions-and-update/

New Forum And Website

Some time ago we had created a user forum at copperhilltechtalk.com. This is an external online service we used to inform users of program updates and provide technical support. However, the link is broken, and we can't get a response from the provider. Consequently, we have plans for a new forum, which will be a part of a new website dedicated to the JCOM1939 Monitor Software. More later...

SAE J1939 ECU Simulator Board With USB Port

The jCOM.J1939.USB gateway board is a high-performance, low-latency vehicle network adapter for SAE J1939 applications. It enables any host device with a USB COM port to monitor and record SAE J1939 data traffic and interact with an SAE J1939 vehicle network.

The board maintains the full SAE J1939 protocol according to J1939/81 Network Management (Address Claiming) and J1939/21 Transport Protocol (TP). A comprehensive programming interface supports the development of Windows and Linux/Ubuntu applications, including full C/C++/C# source code for short time-to-market developments.

More Information...