MTD2000 AT Command Guide R12
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17 Dead Reckoning
17.1 Gyro Calibration – AT$GC
For every device installation on vehicle, the gyro needs to be calibrated for dead
reckoning. This command allows user to instruct the device to start gyro calibration
during the calibration mode. The calibration process is as follows:
- Long press the reset button for 3 sec to enter calibration mode.
- Put the vehicle to forward gear.
- Send this command to the device to start the calibration. The device will take less
than one min for calibration and return an unsolicited response to indicate
calibration result.
Note:
1. When the reset button is long pressed for 3 seconds, the device will enter calibration
mode and send out an unsolicited response to indicate calibration entry.
2. Once the gyro is calibrated (by $GC command) or 5 min is due, the device will return
to normal mode and send out an unsolicited response to indicate calibration exit.
This command ($GC) has no effect during normal mode.
3. When the reset button of device without dead reckoning or motion detect is long
pressed for 3 sec, it will send out an unsolicited response to indicate calibration is
not supported.
4. During normal operation, if the dead reckoning fails to work, the device will send out
an unsolicited response to indicate dead reckoning failed.
Syntax
Command
Response
AT$GC
Note: Execute command.
OK
Parameters
Nil
Example
Command
Response
AT$GC
OK
