Recording
In recording mode, motion data is stored within the sensor internal storage and can be
exported for post-processing. The internal storage of the v2 DOT is 64MB. The available
recording time depends on the selected output frequency. For example, the available
recording time is around 6 hours at 60Hz. With higher output frequency comes less
available recording time.
Recording can be started and stopped using Xsens DOT App and these functionalities are
available in Xsens DOT SDK or BLE Service Specification manual. Bluetooth connection is
not required during recording.
Recording will also stop in the following situations:
• power button is pressed for 1 second during recording.
• time is up for timed recording sessions.
• flash memory is over 90%.
Data can be exported via Bluetooth or via USB connection. Wireless data transfer using
Bluetooth is suitable for exporting small files (a few minutes). However, when exporting
large amounts of data, it is recommended to use Xsens DOT Data Exporter to export via
USB on PC. Refer to this BASE article
on how to use Data Exporter.
As a rule of thumb, when exporting from 5 sensors through the charger, the export speed
is around 0.16Mbps. It takes around 10 min to export 60 min’s recording at 60Hz.
When exporting data via Bluetooth, it is advised to select few sensors at a time to prevent
data transmission loss or connection failure. You can choose different types of data
configurations and select recording files when exporting.
Note that free acceleration is not included. For further information on how to calculate it
from other quantities, refer to this BASE article
.
3.3.7 Power saving
In power-saving mode, sensors will turn off the signal pipeline and BLE connection, put the
MCU in a sleep state to ensure minimum power consumption. In this state, sensors cannot
be discovered by host devices.
The default time thresholds to enter power saving mode is set to 10 min in advertisement
mode and 30 min in connection mode. Power saving mode can be disabled and the time
thresholds can be adjusted in Xsens DOT App, SDK or by BLE services.
Sensors will exit power saving mode when:
• Power button is pressed
• Acceleration is detected by accelerometer
Once the sensor enters power saving mode, you can wake it up by pressing the power
button or simply shaking it. Xsens DOT will return to advertisement mode when exiting
power saving mode.
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