Question

Hi

What output should come from accelerometer on FMC640 FW 01.00.05.Rev.00 IO parameters 236,7,8, ie X,Y,Z outputs?

I am seeing values close to zero or close to 65000, no intermediate values. Changes as vehicle is moving, No Changes when stopped.

FMC is mounted horizontaly with antenna connectors facing front to vehicle, Auto calibration is completed.

Is there some setting to make to fix this problem please?

Bill

Answer 1

Hello Bill, 

Good day. Thank you for your question.

The values you are receiving is signed number and when it is parsed from Hex to decimal, it will appear as close to 65535 when the value is below 0. For example, if the Y-axis is showing as -1 then it will appear as -1/65535 where -1 is the decimal from signed 2's complement. For more information on 2's complement, kindly refer here - https://en.wikipedia.org/wiki/Two%27s_complement.

Attaching an example of how the value appears in the Teltonika Parser and how it is calculated, below:

Hope this clarifies your doubt.

Kind regards.