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any body can explain this?

Eventual I/O elements (254) (https://wiki.teltonika-gps.com/view/FMB001_Teltonika_Data_Sending_Parameters_ID)

254 Green Driving Value -- Depending on green driving type: if harsh acceleration or braking – g*100 (value 123 -> 1.23g).

If Green driving source is "GPS" – harsh cornering value is rad/s*100. If source is "Accelerometer" – g*100.

I use Accelerometer as the source and I receive:

      "alarm": "hardAcceleration",

      "io254": 31

      and

     "alarm": "hardCornering",

     "io254": 60,

what is unit value of io254? .. do I need to multiply them to be human readable value?

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Hello

In multiplier column you can see number you need to multiple with value you get from a device. So for IO 254 you need to multiple it by 0,01 to get actual value in g if source is Accelerometer

So your values 31 and 60 are 0.31g and 0,6g respectively.

If you have anymore questions please ask.

Best Regards.
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Well noted and thanks
by

Why teltonika fmb920 sends alarm hardbrake eventhough the io254 value still below defined value?

Example:

“alarm": "hardBrake",
      "io254": 31

defined max braking is: 2.7

This means: 0.31 < 2.7

by
You need to multiply 0.31 g with 9.8 m/s2 to convert into m/s2 and now its 3.04 m/s2 which is above your set limit of 2.7 m/s2.