The detector came in two versions: FGSS-001 and FGSD-002.
The FGSS-001 version actually had terminals, a 12V power supply option and a relay output in addition to battery power and Z-Wave radio communication.
Unfortunately - for unknown reasons - Fibaro discontinued production of this model and currently only produce the radio model FGSD-002

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I have installed a dozen of these wired detectors myself and have customers who want to have such nice miniature smoke detectors installed.
Unfortunately Fibaro does not offer a radio receiver to enable the wireless detectors to work with a wired alarm system.
I wonder if such an F&F receiver will work with a Fibaro detector:
http://www.fif.com.pl/produkt/2198/2208