The Simplex 4100-3109 (Hardware PCB Part Number: 566-239) is a high-performance IDNet 2 addressable loop interface card designed for Simplex 4100ES and 4100U Fire Alarm Control Panels (FACPs). This crucial expansion module acts as the central communication hub between your fire alarm control panel and intelligent, addressable field devices.

Engineered for flexibility and robust survivability, this IDNet 2 card manages up to 250 addressable points across its signaling line circuits (SLCs), providing reliable data transmission and power to addressable smoke detectors, heat detectors, monitor modules, and control points.