Fire-Liteís intelligent control panels suit a variety of applications. Monitor modules are used to supervise a circuit of dry-contact input devices, such as conventional heat detectors and pull stations,or monitor and power a circuit of two-wire smoke detectors. The MDF-300(A) Dual Monitor Module is intended for use in intelligent, two-wire systems. It provides two independent twowire initiating device circuits (IDCs) at two separate, consecutive addresses. It is capable of monitoring normally open contact fire alarm and supervisory devices. The module has a single panelcontrolled LED.