FMC 640 Unexpected Driver State Change in Tachograph Data

TELEMATICS
1

Hello everyone,

I am currently working with a Teltonika FMC640 device and have encountered an unusual situation in the recorded tachograph data. I have noticed that, within a very short time span (less than a minute), the driver’s status changes as follows:

  1. Driving (D) – The vehicle is in motion, and the tachograph correctly detects the driver as driving.
  2. Working (W) – Shortly after, the status unexpectedly switches to “Working” while the vehicle is still moving.
  3. Driving (D) – Then, it returns to “Driving” again.

This sequence seems unrealistic because it is unlikely that a driver would manually switch the status from “Driving” to “Working” while actively driving, only to switch back immediately.

I am wondering if this could be caused by:

  • A misconfiguration or calibration issue with the FMC640.
  • A sensor glitch or data transmission problem.
  • A software-related issue with the tracking system.

Has anyone else experienced similar inconsistencies? Could this be an issue related to the way Teltonika FMC640 processes and interprets tachograph data?

Any insights or recommendations would be greatly appreciated.

Thank you!

2

Hi,

Good day, for the tachograph related issues, please collect logs from the device or the server logs, provide it to your sales manager or to helpdesk ticket.

Include the following.

  1. SIM details
  2. Configuration file.
  3. How many devices are affected by this issue.
  4. Firmware of the device.
  5. Logs from FMC640 if available.

If you don’t have any contacts with our Sale managers, please contact with them on our official website https://teltonika-gps.com/ and click on the “Contact Us” button. When you click, please fill out the form and submit it.

Best Regards
Maynard C

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