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Good day. Thank you for the question.
Please refer to the following:
Regarding theft alarm, you may opt for our immobilizer function where you use the Ibutton as the driver identification.
For the immobilizer function, https://wiki.teltonika-gps.com/view/FMB140_Features_settings#Immobilizer
For the connection of relays, refer here https://wiki.teltonika-gps.com/view/FMB140_Accessories
For the wiring scheme of Ibutton, please refer here - https://wiki.teltonika-gps.com/view/1-Wire_iButton_Reader and https://teltonika-gps.com/downloads/en/fmb140/FMB140-wiring-scheme.jpg
Kindly go through this and let me know if it helps.