The **KAC-AAF-R** is a specific addressable manual call point (fire alarm trigger) manufactured by KAC Alarm Company, designed for use in fire detection systems. It is primarily used to allow building occupants to manually initiate an alarm signal. --- ### 1. Technical Specifications The electronics within the KAC-AAF-R are designed for high reliability and integration with addressable fire alarm control panels (FACPs). | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 15 to 30VDC | | **Communication Protocol** | Addressable (Typically System Sensor / Morley-IAS) | | **Standby Current** | ~385µA @ 24VDC | | **Alarm Current** | ~7.8mA (with LED on) | | **Operating Temperature** | -10°C to +55°C | | **IP Rating** | IP24D | --- ### 2. Key Electronic Components #### A. Internal Microprocessor The heart of the KAC-AAF-R is an integrated circuit (IC) that manages digital communication with the main fire panel. It monitors the state of the internal switch and reports its unique "address" back to the controller. #### B. Rotary Address Switches Unlike conventional switches, this addressable unit features two rotary dials on the back of the PCB. These allow the technician to set a decimal address (e.g., 01 to 159). This ensures the fire panel knows exactly which room the alarm was triggered from. #### C. LED Indicator The device includes a high-visibility LED: * **Blinking Red:** Indicates the device is communicating normally with the panel (polling). * **Solid Red:** Indicates the device has been activated and is in alarm state. #### D. Switch Mechanism It utilizes a microswitch triggered by the displacement of the "flexible element" (the front plate). When the plate is pressed, the switch changes state, and the microprocessor sends a priority interrupt signal to the loop. --- ### 3. Connection Diagram Logic The unit is wired into a "loop" rather than a simple zone. ```mermaid graph LR A[Panel Loop +] --> B(Call Point In +) B --> C(Call Point Out +) D[Panel Loop -] --> E(Call Point In -) E --> F(Call Point Out -) ``` --- ### 4. Comparison: Addressable vs. Conventional | Feature | KAC-AAF-R (Addressable) | Conventional Call Point | | :--- | :--- | :--- | | **Wiring** | Data Loop | Radial Circuit | | **Identification** | Specific device location reported | Only the zone is reported | | **Complexity** | Contains PCB & Logic | Basic Switch & Resistor |