Some vehicles are already equipped with a fleet management system and unfortunately there is no standard allowing another telematics device and to operate alongside a Samsara Vehicle Gateway (VG).
Third-party devices will generate interference and noise in the CAN network line dedicated to tachograph download, even if it is not used. This often results in frequent tachograph download failures.
When tachograph downloads are interrupted, it is often a result of FMS cabling rather than poor connections on the back of tachograph.
When download is not performed as expected and we receive errors like another system is sharing the same CAN lines or the tachograph is busy.
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If you use an Enhanced VG Series Tachograph Cable for Heavy Goods Vehicles (models CBL-VG-BHGV or CBL-VG-CHGV) ensure the OEM C Cable is left unplugged.
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Disconnect the CAN C lead from the vehicle side to stop interference from any third-party device. Leave CAN C unplugged from the truck side, such that only the Samsara VG is connected to CAN C.
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Plug the jumper on the Y end.
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Run and move the vehicle around 5mn.
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If it is not possible to disconnect the third-party device, unplug the device to allow the first download to succeed.
Because interference can delay the downloads, the tachograph downloads as this usually takes more than twice as long to complete and is more likely to get interrupted. Then downloads on our system may continue.
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For FMS cabling using either CBL-BFMS or CBL-CFMS, if you cannot disconnect the third-party device, change the cables and connect the VG on the back of the tachograph instead of FMS.
In some cases, not all of the vehicle diagnostics will be available on the back of tachograph, particularly fuel consumption data or eco-driving. As a result, it is recommended to use FMS when possible.
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