TMT250 System settings

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Main Page > SAS Personal Trackers > TMT250 > TMT250 Configuration > TMT250 System settings

System settings have the following configurable parameters:

Sleep Settings[edit | edit source]

Sleep Settings, where user can choose sleep mode;

Static Navigation Settings[edit | edit source]

Static Navigation Settings, where users can turn static navigation on or off;

  • Records settings, where user can enable or disable records when GPS is not available (no time synchronization);

GNSS Source[edit | edit source]

GNSS Source settings, where user can choose the necessary satellite system(s);

  • Power On By USB/Charger. Device supports two working modes: normal mode, where the device works as usual, and charging mode, which is entered when Power On By USB/Charger parameter is disabled. To enter normal mode, device can be turned on by power button or by USB charger, if Power On By USB/Charger parameter is set to Enable.
  • Movement Settings, where user can configure movement start and stop delay values (in seconds);

Time Synchronization[edit | edit source]

Time Synchronization settings, where the user can choose which source(s) to use for TMT250 time synchronization. User has a choice to: use only one synchronization source (Disable (GPS only)), allow synchronization from both the GNSS and NTP server (NTP), select synchronization through GNSS and GSM operator (NITZ) or from all three sources (when NITZ+NTP is selected). Users can select which NTP server (it is possible to configure up to two servers) and what time period to use to resynchronize time.

New time synchronization method implementation[edit | edit source]

From 03.25.14 firmware the new time synchronization works by waiting a minute on startup to acquire fix and consequently synchronizes the time via GNSS.
This state checks the difference between RTC and GNSS times every second. If the difference of at least 3 seconds persists to be for 5 seconds, the firmware triggers a resynchronization procedure by GNSS.
After that, the time difference is still calculated, but the difference is expected to persist for at least 5 minutes to trigger a GNSS time resynchronization.
In the case that there is no fix or it is lost during the syncing by GNSS state, the firmware goes to the state of syncing by NTP. Entering the state of NTP syncing, the firmware immediately attempts to synchronize the time by triggering NTP and later on, does this periodically every time the configured NTP resynchronization time is reached (if the resynchronization time is set to 0 – no NTP sync is performed at all). Time synchronization by NITZ can occur at any time.

Timesyncflowchart.png


Accelerometer Auto Calibration[edit | edit source]

Accelerometer auto calibration.PNG


User can disable or enable Accelerometer Auto Calibration and Gravity Filter features. This Feature is available from firmware version 03.25.07.Rev.00. Under Accelerometer Auto Calibration settings, user can choose:


* Disable – do not use auto calibration feature (sends AXES raw data).
* Once – calibrate one time only.
* Continuous – continuously analyzes current data and re-calibrates if needed.


Important! If Auto calibration is disabled, device should be mounted according User manual for EcoDriving feature to work properly. If enabled, AXES will be reoriented to VEHICLE axes according User manual (+X – Forward, +Y – Left, +Z – Down).


Gravity filter substracts gravity from vector when devices is calibrated or if auto-calibration is disabled (default values). Gravity is only removed when gravity filter is enabled.
Filter settings, user can choose:


* Disabled – do not remove GRAVITY component from AXL/Crash data.
* Enabled – remove GRAVITY component from AXL/Crash.

Note: In FM*0YX devices autocalibration is set by default and it is not configurable via configurator. Device connected to OBD port is not positioned accoring to the vehicle axis and in this case autocalibration is must.

Multiple Movement Sources[edit | edit source]

From new firmware version 03.25.14.Rev.03 added new multiple movement sources selection at once. If any of selected movement sources are active, movement mode will be activated. If all selected sources are inactive STOP mode will be enabled. Configurable movement parameter ID has been changed. Information regarding configurable parameter ID could be found in the table below:

Firmware version until 03.25.14.rev.03 Firmware version from 03.25.14.rev.03
100 - Parameter ID 138 - Parameter ID

GPS Power Saving functionality is present on TMT250. Its purpose is to reduce power consumption and its main function is to turn off the GPS module when the device is stationary. For power saving functionality to run several conditions need to be met: Min Period value in Data Acquisition is more than or equal to 60 seconds and GPS search period in System must be set between 5 and 300. In device cold start state the GPS module is turned on for 180 sec. If GPS fix is obtained before this timeout elapses, GPS module turns off and a record is saved, and if not, no record will be saved. Before each new record saving period is expired the device is constantly checking for movement and if no motion has been detected, the GPS module does not turn on and the device waits for a periodic record to be eventually saved. If motion is detected at least 15 seconds before the record saving action, the GPS module will be turned on. If Records Saving/Sending Without TS configuration is set Always or After Time Sync a periodic record is saved and GPS is turned off again. Alternatively, if configuration is set to After Position Fix, the device will try to obtain GPS fix before record saving takes place and then allow extra GPS search period to obtain fix. Failing to do so within GPS search period, GPS module will be turned back off and the record will be not saved at all. Static Navigation mode is a filter, which filters out track jumps when the object is stationary. If static navigation filter is disabled, it will apply no changes to GPS data. If static navigation filter is enabled, it will filter changes in GPS position if no movement (as defined by configured movement source) or ignition (as defined by configured ignition source) is detected. It allows filtering GPS jumps when the object is parked (not moving) and GPS position is still traced.

FMB System settings-TMT250.PNG

In GNSS Source settings user can configure which GNSS system(s) to use.
User has a choice to use only one system between GPS, GLONASS, Galileo or Beidou and it is possible to choose two or three systems together. One exception is that you cannot combine BeiDou and GLONASS systems together. Examples of non-configurable GNSS source combinations are:

  • GLONASS + BeiDou;
  • Galileo + GLONASS + BeiDou;
  • GPS + GLONASS + BeiDou;
  • GPS + Galileo + GLONASS + BeiDou.

List of configurable GNSS sources:

Selected source(s) ID
BeiDou only 01
GLONASS only 02
Galileo only 04
Galileo + BeiDou 05
Galileo + GLONASS 06
GPS only 08
GPS + BeiDou 09
GPS + GLONASS 10
GPS + Galileo 12
GPS + Galileo + BeiDou 13
GPS + Galileo + GLONASS 14