This technical report is based on the technical specification details an implementation of the DSRC-CAN interface and communication protocol based on the SAE J1939 standard between the Vehicle Unit and a CAN based DSRC module in a Smart Tachograph System. The technical specification has been defined by the tachograph manufacturers Stoneridge, Continental and Intellic with the technical support of the Joint Research Centre of the European Commission and the vehicle manufactures via the HDEI (Heavy Truck Electronic Interface) working group.JRC.E.3-Cyber and Digital Citizens' Securit
