The **FAS-D1-R** is an addressable remote indicator module, typically used in fire alarm systems to provide a visual signal when a hidden detector (such as one located in a ceiling void or a locked room) is activated. Below is an explanation of its electronic components, technical specifications, and wiring structure. --- ### 1. Key Electronic Components The device is a combination of optical signaling and digital communication electronics. | Component | Function | | :--- | :--- | | **High-Intensity LEDs** | Provides a bright red visual alarm signal, visible from a wide angle. | | **Addressable IC** | A microprocessor or logic chip that allows the fire alarm control panel (FACP) to identify and trigger this specific unit. | | **DIP Switches / Programmer Port** | Used to set the unique digital address of the module on the SLC loop. | | **Current Limiting Resistors** | Protects the LEDs from overcurrent when the alarm circuit is active. | | **Blocking Diode** | Ensures polarity protection and prevents reverse current flow. | --- ### 2. Technical Specifications The FAS-D1-R operates on the signaling line circuit (SLC) and draws minimal power during standby. | Feature | Specification (Typical) | | :--- | :--- | | **Operating Voltage** | 15V - 32V DC (Loop Powered) | | **Standby Current** | < 200 µA | | **Alarm Current** | ~2mA - 5mA (LED active) | | **Communication Protocol** | Digital / Addressable | | **Operating Temperature** | -10°C to 50°C | | **Relative Humidity** | 10% to 95% (Non-condensing) | --- ### 3. Wiring and Connection Logic The FAS-D1-R is connected to the fire alarm system via a two-wire loop. Unlike conventional remote lamps that connect directly to a detector's base, addressable units like the FAS-D1-R are mapped through software. #### Standard Wiring Diagram Block: ```text [FACP Loop Output] (+) ----+---- [FAS-D1-R Terminal L+] | [FACP Loop Output] (-) ----+---- [FAS-D1-R Terminal L-] ``` * **Polarity Sensitivity:** The device is polarity sensitive; swapping the positive and negative leads will prevent the device from communicating with the panel. * **Addressing:** The module must be assigned a unique address (e.g., Address 052) so the control panel knows which specific room or area is in alarm. --- ### 4. Functional Operation 1. **Polling:** The fire panel constantly sends a digital "heartbeat" to the FAS-D1-R. 2. **Triggering:** When a linked smoke detector senses fire, the panel sends a command specifically to the FAS-D1-R's address. 3. **Indication:** The onboard transistors switch the circuit, lighting the Red LEDs to alert personnel to the fire's location.