Serial protocols for communication between the various electronic control units (ECUs) and parts of the drive train are widespread and standardised in the commercial vehicle industry. The following benefits are linked to using a serial protocol that is standardised:
Because commercial cars are produced in such small quantities, component manufacturers only need to adopt one protocol. Commercial vehicle manufacturers might rely on parts from several suppliers. The ability of components from several manufacturers to operate together without modifications is known as interoperability.
Both “On-Road” (Truck & Trailer) and “Off-Road” heavy commercial vehicles employ SAE J1939 (Construction, cranes, etc.). All of these protocols, which are based on J1939, are utilised in the fields of agricultural and forestry machinery after ISO11784, in marine settings after NMEA2000, and in the military after MilCAN.
The creation of CAN modules and corresponding protocol implementations to support this message format was required for J1939 due to the requirement for compatibility with the current J1708 / J1587 protocol and the enlargement of the CAN message identification from 11 to 29 bit.
J1939 cable can be used to configure components, transfer measurement values, and control data. In addition, it is possible to view or remove. The SAE J1939 cable, which has developed into an established industry standard, is the chosen vehicle network technology for off-highway machinery in areas including forestry, material handling, and construction machines. OBD 2, or On-Board Diagnostic 2, is the second generation of on-board self-diagnostic technology necessary for light- and medium-duty State vehicles.
An adapter known as J1939 to OBD2 connects a 16-pin OBD2-style connector to a 9-pin circular Deutsch connector on the J1939 test equipment side (female vehicle side – mates with an OBD2 test connector). Also linked are the J1939 +/- data lines, CAN +/- lines, power and ground cables. This adapter allows an OBD2 scan tool to connect to the J1939 round connection when the appropriate software is used. PIDs are single parameters that are read by the majority of OBD2 programmes and scanners. Each PGN in the PGN-based J1939 protocol has a number of parameters. Your scan tool must support PGNs if you wish to utilise this adaptor.
J1939 cable uses CAN 2.0B's improved (29 bit) identification. The CAN identification is composed of the priority (3 bits); reserved (1 bit), data page (1 bit), PDU format (1 byte), PDU specific (1 byte), and source address (one byte). Although commercial trucks or buses utilise the FMS, off-road vehicles with diesel engines use the SAE J1939. The Second Generation On-Board Diagnostics (OBD-II) is mostly utilised for small automobile data. The best place to buy J1939 to OBD2 & J1939 Cable is Yasoncable. Go to the website for additional details.
