SAE J1939 to USB Gateway in Plastic Enclosure

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The SAE J1939 to USB Gateway utilizes our SAE J1939 ECU Simulator Board With USB Port and embeds it in an enclosure. The SAE J1939 gateway allows you to monitor, simulate, and record any PGN as defined in the SAE J1939-71 Standard but also including diagnostic messages according to SAE J1939-73.

Gateway Features

• Fully SAE J1939 compliant hardware with on-chip SAE J1939 protocol, including Transport Protocol (TP)
• Free-of-charge Windows analyzer software
• Monitor, record, and analyze SAE J1939 data traffic
• Simulate SAE J1939 data traffic
• Respond to message requests
• Define message filters
• Automatic node address negotiation
• Fully programmable per USB port
• Virtually OS independent
• Programming sample for Windows, Linux, and embedded systems
• Powered per USB port
• Size: 4.25 x 2.63 x 1.27 in / 107.95 x 66.80 x 32.26 mm

General Functionality

In general, yes, our SAE J1939 gateway allows you to monitor, simulate, and record any PGN as defined in the SAE J1939-71 Standard but also including diagnostic messages according to SAE J1939-73. Many users ask us whether or not we can process specific parameters such as fuel consumption, vehicle speed, vehicle position, etc., and the answer is always yes. However, you need to understand that the gateway was not designed for specific engine parameters, i.e., you need to know which PGN represents the desired data. Also, the gateway was not designed to simulate specific diesel engines, but if you enter all PGNs that are being used, you can design and simulate any diesel engine.

For further detailed information on this topic, see our post A Beginner's Guide to SAE J1939 Embedded Software Development. It is not only about programming but will answer all questions you may have about PGN design.

Technical Functionality

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

The board supports the full SAE J1939 protocol according to J1939/81 Network Management (Address Claiming) and J1939/21 Transport Protocol (TP). It is also supported by an extensive programming interface for Windows and Linux/Ubuntu applications, including full C/C++/C# source code for short time-to-market developments.

The strength of the board lies in the fact that the entire SAE J1939 protocol, including all timing requirements, is stored on-chip, thus taking the burden off the main system. The board uses a USB COM port to communicate with the main system, i.e. all data transfer is handled through a standard COM port access. The communication protocol between the board and the main system is well documented and thus allows a porting to any computer system with a USB connection. Working source code libraries exist for Windows (C# under Visual Studio 2102/2013), Linux and its derivatives (C++ using Code::Blocks), and Raspberry Pi (C using the standard gcc compiler).

With all its features, the jCOM.J1939.USB allows the simulation of an SAE J1939 ECU (Electronic Control Unit) using embedded solutions such as the Raspberry Pi, BeagleBone, Arduino, Teensy, and others but also PCs running Windows or Linux (incl. Ubuntu, Fedora, etc.).

SAE J1939 Starter Kit

It may sound obvious to the experienced J1939 user, but you will need a second J1939 node to establish a network.

If you are a beginner to the J1939 technology and/or you do not have a second J1939 node available, please consider our SAE J1939 Starter Kit and Network Simulator. The Starter Kit is a helpful tool for creating and analyzing J1939 data traffic.

Testing A Device With "Silent Mode" Or Automatic CAN Baudrate Detection?

If you need to communicate with an SAE J1939 node that starts up in "Silent Mode" or supports automatic baudrate detection, please be aware that our USB device will not be able to recognize it. You will be better off using our SAE J1939 Starter Kit as described above,

For more information, see How CAN Bus Automatic Baudrate Detection Works And What To Consider When Connecting To A Network.

CAN Port

Termination Resistor

The gateway comes with an onboard jumper to activate or deactivate the termination resistor. In order to access the jumper, please open the enclosure:

The jumper is closed (activated) per default.

Free-Of-Charge Windows Software

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.

In addition, the gateway is supported by our free-of-charge  jCOM1939 Monitor, an SAE J1939 Monitoring, Analyzer and ECU Simulation software under Windows.

Our JCOM1939 Monitor Software for Windows is a complete tool to monitor, analyze, record, and simulate SAE J1939 data traffic. It works in combination with our SAE J1939-USB gateways. The monitor software represents a comprehensive and easy-to-use, easy-to-understand tool that displays not only SAE J1939 data traffic; it also allows scanning the network, simulating an ECU (incl. full node address negotiation features), and responding to data request messages.

jCOM.J1939.USB Technical Features:

• Full SAE J1939 Protocol on chip
• Virtually OS independent
• Easily adaptable; just access the COM port
• Works with PCs, Raspberry Pi, BeagleBone, Teensy, Arduino
• Protocol is well documented
• C source code available
• Windows tool: jCOM1939 Monitor
• Power applied through USB port
• Operating Range: -40...+85 C
• Board dimensions: 92 mm x 41 mm; 3.6" x 1.6"
  Add 10 mm / 0.4" for terminal block

Supported SAE J1939 Features Include:

• Hardware is fully SAE J1939/1x compliant
• Switchable termination resistor
• SAE J1939/21 - Data Link Layer
• SAE J1939/81 - Network Management
• Setup of Preferred Node Address
• Adjustable Node Address Negotiation Range
• Message Filters
• Full Network Communication incl. Transport Protocol
• Design Tx Messages Incl. Transmission Rate
• Configuration of Request Responses
• Configuration of Request Messages
• Network Scanner (Creates a list of all nodes in the network)

Quick Trouble-Shooting Guide

Many users connect our board to their SAE J1939 network but overlook a few required steps during setup. You can prevent most initial setup problems by checking the following:

• Did you activate the termination resistors on both devices?
• Are you using the same CAN baud rate on both devices?

For further, detailed information, please refer to:

• A Beginner's Guide to SAE J1939 Embedded Software Development...

Documentation

• User Manual (PDF)...
• Firmware Versions & Update...

Firmware Update

Current Version: V 1.33.00

• JCOM.J1939.USB-B Firmware Update (PDF)...

Programming Under Windows, Raspberry Pi, And Linux

• Programming the SAE J1939 ECU Simulator Board Using Visual Studio C#...
• SAE J1939 ECU Simulation And Data Monitoring Under Linux...
• SAE J1939 ECU Simulator And Data Monitor for Raspberry Pi...

Resources

• Connecting the jCOM.j1939.USB Board Hardware...
• jCOM.J1939.USB Serial Communication Protocol...
• FREE Add-On: jCOM1939 Monitor, SAE J1939 Monitoring, Analyzer and ECU Simulation software for Windows...
• Simulating SAE J1939 PGNs Used By Truck & Bus FMS (Fleet Management System) Standard...
• SAE J1939 Address Claim Procedure - SAE J1939/81 Network Management...
• SAE J1939 Monitor Software - Setting Up PGN Simulation Such As Engine Coolant Temperature...,
• SAE J1939 Simulator Generates Frequently Used SAE J1939 Signals (PGNs) For Diesel Engines...

SAE J1939 Insights 

• SAE J1939 Message Format And Interpretation Of PGNs...
• SAE J1939 Utilizes CAN Bus Message Collision During Bus Arbitration...

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...