SAE J1939 to Bluetooth Gateway Module

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The J1939.BT gateway is a high-performance, low-latency, wireless vehicle network adapter for SAE J1939 applications. It allows any host device with a Bluetooth COM port to monitor SAE J1939 data traffic and communicate with the SAE J1939 vehicle network. An SAE J1939 cable, suited for a 9-pin Deutsch connection, can be purchased as indicated above. 

The gateway 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 gateway 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 wireless Bluetooth 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 Bluetooth 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 J1939.BT gateway 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, Linux (incl. Ubuntu, Fedora, etc.), Android, or iOS.

External BT Antenna

We chose an external antenna over an PCB type to assure best transmission quality. Research indicates that when a Bluetooth antenna is placed inside or next to a plastic enclosure, its RF signal is impeded by as much as 37.5%. As a result, the broadcast signal can shift from the official Bluetooth frequency range, between 2.4 and 2.4835GHz, to 2.159GHz.

Ref: Plastic enclosures may impede Bluetooth signals - EE Times...

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 source code to read and write CAN data frames.

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

The jCOM1939 Monitor Software is the perfect tool to monitor, analyze, and simulate SAE J1939 data traffic.

The system combines a powerful monitoring software with our jCOM.J1939.BT that functions as an SAE J1939 to Bluetooth 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.

Features

• CAN Bus Interface - Fully ISO-11898 Compliant
• Onboard Interface For On-Site Firmware Update
• Bluetooth port with external antenna
• SAE J1939 Protocol Stack
• Extended Temperature Range of -40C to +85C
• Input Power Range of 7 VDC to 36 VDC
• Flame Retardant ABS Enclosure 3.29 x 2.42 x 1.00 in / 83.57 x 61.47 x 25.40 mm
• Environmentally friendly, RoHS compliant

Specifications

• CAN Interface
• CAN Controller integrated in microcontroller
• Fully ISO 11898-compliant
• Supports CAN 2.0A And CAN 2.0B
• Bit rate 250/500 kBaud
• Bluetooth Connection
• Fully certified Bluetooth version 2.1
• Backwards-compatible with Bluetooth version 2.0, 1.2, and 1.1
• Low power: 26 µA sleep, 3 mA connected, 30 mA transmit
• Bluetooth SIG certified
• Certifications: FCC, IC, CE
• SAE J1939 Protocol Stack
• Fully compliant to SAE J1939/21, SAE J1939/81
• Sending and receiving of messages (PGNs)
• Message filtering
• Request message processing
• BAM and CM transport protocol (TP) processing
• Static and arbitrary address claim 

Connecting Bluetooth to a Windows PC

• How to connect and pair a Bluetooth device with Windows 10…

Connecting Bluetooth to an Android Device

• Android Basics: How to connect a Bluetooth Device…

Note:
Some of the information below refers to our previous gateway version. However, the functionality as described is the same. We are working on updating the information.

Documentation

• JCOM1939 Monitor Pro - User Manual (PDF)...
• JCOM1939 Monitor Pro - Download...
• 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...

More Resources

• jCOM1939 Monitor, an SAE J1939 Monitoring, Analyzer and ECU Simulation software...
• Communication protocol between the gateway and the host system...
• Embedded ARM System Serves As SAE J1939 to Bluetooth Gateway...
• How CAN Bus Automatic Baudrate Detection Works And What To Consider When Connecting To A Network...
• ELD Concept: SAE J1939 Data Recording And Display Using Android Or iOS Devices...
• SAE J1939 to Bluetooth Gateway - Android Code (Java) Sample Code...

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With Bluetooth Low Energy (BLE), smart devices are about to become even smarter. This useful guide shows how this impressive wireless technology helps developers create mobile applications that share data with external hardware and how hardware engineers can obtain easy and reliable access to mobile operating systems.

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More Information...