The **KAC-AAG-R** is a specific model of an **Addressable Manual Call Point (MCP)**, commonly used in fire alarm systems. It is manufactured by KAC Alarm Company (part of the Honeywell group) and is designed to interface with intelligent fire alarm control panels. Below is an explanation of its electronic components and specifications. --- ### 1. Electronic Component Breakdown The KAC-AAG-R differs from standard "switch" call points because it contains an internal PCB (Printed Circuit Board) for digital communication. | Component | Function | | :--- | :--- | | **Communication Module** | An onboard microchip that communicates using a specific protocol (often System Sensor or Morley-IAS) to report its status to the control panel. | | **Addressing Switch** | Usually features two rotary dials (0-9) used to set a unique decimal address for the device on the signaling line circuit (SLC). | | **LED Indicator** | A bi-color LED (Red/Green) that indicates polling (flicker) or an active alarm state (solid red). | | **Plug-and-Play Terminal** | A specialized terminal block that allows for pre-wiring and easy connection to the loop. | | **Monitoring Resistor** | Built-in circuitry to monitor for open or short circuits on the local connection. | --- ### 2. Technical Specifications | Feature | Description | | :--- | :--- | | **Operating Voltage** | 15V to 30V DC (Loop powered) | | **Current Consumption** | ~385μA (Standby) / ~7.8mA (LED Red) | | **Communication Protocol** | Analog Addressable | | **IP Rating** | IP24D (Standard indoor use) | | **Operating Temperature** | -10°C to +55°C | --- ### 3. Key Electronic Features #### A. Addressability Unlike "conventional" call points that simply close a circuit, the KAC-AAG-R sends a unique digital ID to the fire panel. This allows the panel to display exactly where the fire was triggered (e.g., "Manual Call Point - 2nd Floor West Wing"). #### B. Plug-and-Play Integration The electronic design utilizes a "Terminal Tray" system. The wiring is connected to a separate block, and the electronic head of the call point is snapped into place. This prevents damage to the sensitive electronic PCB during the construction/wiring phase of a building. #### C. Built-in Isolators (Optional Variant) Some versions of the KAC-AAG series include an integrated **Short Circuit Isolator**. This electronic sub-circuit detects a short on the loop and "isolates" the fault to prevent the entire loop from failing. --- ### 4. Wiring Diagram Concept The device is connected in a loop configuration: * **L1 (+ In/Out):** Positive loop connection. * **L2 (- In/Out):** Negative loop connection. * **Screen:** Connection for the cable's earth/shield to ensure EMI protection for the internal electronics. ---