HEM Data Products

Applications, Training & Consulting

New Book

HEM Data is pleased to announce that it has written a book entitled Data Acquisition from HD Vehicles Using J1939 CAN Bus. It is published by SAE and available from SAE and directly from HEM Data.

The focus of the book is how to acquire and correctly interpret data from the in-vehicle network of heavy-duty (HD) vehicles using the SAE J1939 standard. The book presents an introduction to CAN, the building block of J1939, and guides the reader through various SAE J1939 standards.

The reader will learn how to determine the available parameters on HD vehicles including their accuracy and sample rates, and how to acquire and convert messages to scaled engineering parameters. Finally, the book presents practical applications including diagnosing intermittent problems, duty/drive cycle analysis, and web-based dashboards to summarize fleet data.


HEM Data’s products are used in a wide variety of applications for on-road and off-road vehicles that include:

Additional applications include

  • Vehicle performance / development
  • Vehicle comparison / competitive analysis
  • Vehicle inspection / appraisal
  • Drive & duty cycle – how vehicle is used
  • Driver behavior / training
  • Emissions
  • Diagnostic & Alerts
  • Geofencing

Read our past eNewsletters for applications of our DAWN hardware and software. Topics include Fuel Economy, Diagnostics/Service, Electric Vehicles, Telematics, and CAN/OBD/J1939 information.

Testing Advanced Vehicles

HEM Data is on the forefront of testing advanced vehicles. Some of the vehicles tested are the Chevy Volt, Nissan Leaf, Prius Plug-in and more.
Enhanced Databases


HEM Data will help you with your OBD and J1939 CANbus data acquisition and analysis solutions:

  • Develop custom web-based dashboards to automate your analysis and display of data. DAWN Dashboard
  • Analyze your data
  • Develop smart phone applications See more.
  • Calculate fuel economy improvements of your product versus the standard vehicle. Fuel Economy examples (of 111 vehicles)
  • Reverse engineer competitive vehicles
  • Acquire data from advanced vehicles such as the Chevy Volt, Nissan Leaf, Prius Plug-in and more. See Testing Advanced Vehicles.
  • Provide training on HEM Data’s products

Watch an example application of our OBD Mini Logger. It is a 17 minute video about time series anaylsis that is provided by one of our customers. This is also an area where we provide consulting.

J1939 Mini Logger™ OBD Mini Logger™ DAWN Telematics™ DAWN™ Software ADAQ Mini™ DAWN Dashboard™