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IDC (Initiating Device Circuit) is typically a conventional, zone-based supervised input circuit where devices are wired in parallel on a circuit and the panel sees the whole zone state (normal/alarm/trouble). SLC (Signaling Line Circuit) is a supervised data/power loop used in addressable systems; each device has an address, allowing the panel to identify the exact device in alarm/trouble.
Worked example(s) Example: In a conventional system, 'Zone 3 smoke detectors' might alarm but you must search the zone to find which detector. In an addressable SLC system, the panel may display 'Smoke Detector 3rd Floor East Corridor'.
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