The **GSA1-R** is a specific electronic module, most commonly associated with **Edwards (EST)** fire alarm systems. It is a **Remote Relay Module** designed to provide a dry contact output for controlling external equipment based on commands from the fire alarm control panel. --- ### ## Technical Specifications The following table highlights the core electrical characteristics of the GSA1-R module: | Component / Feature | Specification | | :--- | :--- | | **Operating Voltage** | 15.2 to 19.95 Vdc (Signature Data Circuit) | | **Current (Standby)** | 45 µA | | **Current (Activated)** | 45 µA | | **Relay Type** | Form C (SPDT) | | **Contact Rating (Resistive)** | 2.0 A @ 30 Vdc; 0.5 A @ 120 Vac | | **Operating Temp** | 32°F to 120°F (0°C to 49°C) | | **Address Requirements** | Uses 1 Module Address | --- ### ### Key Electronic Components & Operation The module functions through a combination of digital communication and electromechanical switching: 1. **Microprocessor (Signature Series):** * The board contains an onboard microprocessor that facilitates smart communication with the FACP (Fire Alarm Control Panel). * It stores its own serial number and tracks maintenance data, such as the date of manufacture and hours of operation. 2. **Relay (Form C):** * The "R" in GSA1-R stands for **Relay**. * It features a single-pole double-throw (SPDT) contact set. This allows for both **Normally Open (NO)** and **Normally Closed (NC)** configurations. 3. **Status LED:** * A built-in LED provides visual diagnostics. Usually, a green flash indicates the module is communicating with the loop controller, and a steady red or specific pulse indicates activation. --- ### ### Wiring Configuration The GSA1-R is typically wired using the Signature Data Circuit (SLC). Below is a conceptual representation of the terminal connections: ```markdown Terminal 1 & 2: Data In (From Controller or Previous Device) Terminal 3 & 4: Data Out (To Next Device) Terminal 5: Common (C) Terminal 6: Normally Closed (NC) Terminal 7: Normally Open (NO) ``` --- ### ### Typical Applications Electronic relay modules like the GSA1-R are used to interface the fire system with building automation: * **HVAC Control:** Shutting down fans to prevent smoke spread. * **Door Release:** Releasing electromagnetic door holders. * **Elevator Recall:** Triggering elevator controllers to return cabs to the primary floor. * **Security Integration:** Unlocking access-controlled doors during an emergency.