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Hello,
Thank you for the query.
Please see links below for more information regarding Immobilizer function and SMS command to activate and de-activate DOUT:
https://wiki.teltonika-gps.com/view/FMB920_Features_settings#Immobilizer
https://wiki.teltonika-gps.com/view/FMB_SMS/GPRS_Commands
https://wiki.teltonika-gps.com/view/FMB_setdigout
Do let me know if you have any question.
Best Regards,