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1,292 bytes removed ,  12:12, 4 September 2020
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SAE J1708 is a standard used for serial communications between ECUs on a heavy duty. The hardware utilized are RS-485 transceivers wired for open collector operation through the use of a pullup and pulldown of the separate data lines.
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{{Template:FMX640 and J1708
 
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|model=FMM640
With FMB640, J1708 functionality is used to read vehicle's Fuel Level and Fuel consumption.
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|FMB640CFG = }}
 
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Because J1708 is not a CAN BUS protocol, FMB640 CAN1 and CAN2 lines cannot be used to read J1708 information. FMB640 has a special J1708 Port, which utilizes RJ9 4P4C connector.
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[[image:J1708.png]]
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[[image:J1708_pinout.png]] <br>
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==Software Configuration of FMM640 with J1708==
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Firmware version: 00.00.11 or above
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Configurator version: 0.13.35.29297 or above
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J1708 configuration is done in FMS IO Tab.
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[[image:J1708_config.gif]]
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When J1708 is enabled as Fuel Level source, Fuel related data will be taken from J1708 line, FMS Fuel data will be ignored.
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==Connection with Vehicle port==
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J1708 connector is not supported by all vehicles. Only VOLVO, RENAULT and American truck manufacturers implement J1708 connector.
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[[image:J1708_pinout1.png]]
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Trucks utilizes Deutsch 9-PIN connector, which is used to connect FMM640 to J1708.
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[[image:Deutsch_j1708.png]]
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{|
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| [[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>
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|}
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[[Category:FMM640 Manual]]
 
[[Category:FMM640 Manual]]

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