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... Show more 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'. Show less
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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