Interface & Expansion Modules

About this category

Interface modules are the translators that link the addressable system to the world outside it. General design: small modules installed in wall-mount enclosures or inside equipment cabinets, each carrying a unique address and connecting to the main SLC. Types: input modules (reading signals from external contacts such as a sprinkler pressure switch, a heat detector from another system, or an emergency button), output modules (fuel-shutoff valves, elevator recall, HVAC, magnetic doors, server shutdown), combined I/O modules (both in one), isolator modules (isolate a loop segment on a short so the rest keeps working), zone interface modules (convert conventional detectors into addressable loops, letting old buildings integrate with new systems), and voice-alarm interfaces (linking voice-alarm systems). Electrical principle: on the same SLC, each module addressed like any detector. Key advantages: expansion flexibility (adding devices beyond ordinary detectors), integration with other systems, and loop fault protection. Applications: linking the panel to: sprinkler and hydrant pressure switches, kitchen gas-shutoff systems, elevators (recall to ground on fire), HVAC (stop ventilation to prevent smoke spread or run smoke-extract fans), magnetic doors (unlock for evacuation), emergency lighting, and access control. A technical note: isolator modules are essential in large buildings to prevent total loop failure from a local short. Model acceptance documentation varies — review the product documentation and project requirements.