I'm having some problems reading the acceleration values from my PCAN-GPS.
I'm using BUSMASTER to read the data:

Acceleration_X and Acceleration_Y seems ok (around 50mG and -40mG), but Acceleration_Z returns a unexpected high value (PCAN-GPS isn't moving) around 900mG.
I tried sending a bit over can on 0x657 (Acc_StartFastCalib), and then the raw data started ranging around -1 and 1 (decimal, for X, Y and Z), sometimes -3~3, which seems correct:

But once i reboot the module, the old values return.
So my question is: what is the correct procedure for calibration and what values should I expect to see when the module isn't moving.
Thanks,
Pedro