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Truck Blind Spot Detection System Connects To SAE J1939 Bus

Posted by Industry News on

The Side Defender system actively warns operators with audible and visual alerts, in order for them to take the appropriate actions to mitigate collisions.

Preco Electronics announced their PreView Side Defender, an advanced side collision avoidance solution that has been developed specifically for the over-the-road (OTR) markets including trucking, municipalities, waste and recycling.

The system warns operators of objects in the vehicle’s side blind zones, including pedestrians, bicyclists and vehicles, in order to reduce the incidence of side collisions. It can read vehicle speed messages via J1939. The radar-based sensor system operates in different modes. 

In highway mode, it alerts operators of vehicles in the side blind zones, while ignoring stationary objects such as guardrails to reduce nuisance alerts. In slow-speed mode, the blind-spot detector is positioned to play an integral role in the emerging side turn assist applications, aimed specifically at reducing the incidence of collisions with pedestrians and cyclists in urban environments.

Industry standard CAN bus integration allows PreView Side Defender to read the vehicle’s speed messages.

The sensor system is able to detect and report up to 16 targets. It supports sensor fusion and telematics integration, and provides the ability to integrate with telematics applications, vision systems, LED mirror indicators, or other sensors.

European truck vendors develop a communication standard for trailers with such blind-spot sensors. The J1939-based ISO 11992-3 standard will support automatic line departure control. The standardized CAN link between trailer and truck provides the necessary information about detected objects in respect to speed and direction.


  • Frequency: 24Ghz
  • Detection range (fore/aft): Up to 20’/6M forward and up to 20’/6M back/aft
  • Detection width: 10’/3M to 8M)
  • Current Draw: Less than .25 AMP
  • Operating Temp: -40 F/ +185 F (-40 C to +85 C)
  • Sensor Dimensions: 4.9”H x 4.06”W x 1.28”D
  • Display Dimensions: 1.0”H x 2.3”W x 2.0”D
  • Built to meet rugged J1455 Specs
  • Utilizes standard CAN communication protocols (J1939, ISO 11898)

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With all its features, the jCOM.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.

SAE J1939 to Bluetooth Gateway

The jCOM.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, is included with the gateway.

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.

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