View source for Template:FMX640 and J1708

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==Description==
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 [[{{{model|FMX640}}}]], J1708 functionality is used to read vehicle's Fuel Level and Fuel consumption. 

Because J1708 is not a CAN-BUS protocol, [[{{{model|FMX640}}}]] CAN1 and CAN2 lines cannot be used to read J1708 information. [[{{{model|FMX640}}}]] has a special J1708 Port, which utilizes an RJ9 4P4C connector. 

[[Image:FMX640_and_J1708_illustration_v1.2.png]] <br>

==Software Configuration of {{{model|FMX640}}} with J1708==

{{{FMB640CFG|'''Firmware version:''' 00.00.11 or above </br>
'''Configurator version:''' 0.13.35.29297 or above
}}}
J1708 configuration is done in the [[{{{model|FMX640}}}_LVCAN_I/O,FMS_IO_and_Tachograph_data_elements|FMS IO]] Tab.

[[image:J1708_config.gif]]

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==

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 {{{model|FMX640}}} to J1708. 

[[Image:FMX640 and 6PIN J1708 connection scheme v1.2.png|575px]] [[Image:FMX640 and 9PIN J1939 connection scheme v1.1.png|575px]]

{|
| [[File:Alert.png|left|link=|50px]] || <b>NOTE: Most of the Volvo trucks need an J1708 connection to be able to receive fuel level data</b>
|}