SAE J1708 is a standard used for serial communications between ECUs on heavy-duty. The hardware utilized is RS-485 transceivers wired for open collector operation through the use of a pullup and pulldown of the separate data lines.
With FMC650, J1708 functionality is used to read vehicle's Fuel Level and Fuel consumption.
Software Configuration of FMC650 with J1708[edit source]
J1708 configuration is done in the FMS IO Tab.
When J1708 is enabled as a Fuel Level source, Fuel-related data will be taken from the J1708 line, FMS Fuel data will be ignored.
Connection with Vehicle port[edit source]
J1708 connector is not supported by all vehicles. Only VOLVO, RENAULT, and American truck manufacturers implement the J1708 connector.
Trucks utilize Deutsch 6-PIN or Deutsch 9-PIN connector, which are used to connect FMC650 to J1708.
|NOTE: Most of the Volvo trucks need an J1708 connection to be able to receive fuel level data|