The **FLM-CG-R** is an addressable manual pull station (Call Point) used primarily in Bosch fire alarm systems. It is designed to interface with a Fire Loop Module (FLM) to provide manual activation of fire alarms. --- ### 1. Technical Specifications The electronic architecture is based on the **LSN (Local Security Network)** improved technology, which allows for complex bi-directional communication with the fire panel. | Component / Feature | Specification | | :--- | :--- | | **Operating Voltage** | 15 V DC to 33 V DC (LSN loop powered) | | **Current Consumption** | Approx. 0.26 mA (standby) | | **Communication Protocol** | LSN improved version | | **Addressing** | Rotary switches (001 - 254) or automatic | | **Display** | Integrated LED (Red) | | **Protection Class** | IP 52 (standard housing) | --- ### 2. Core Electronic Components #### A. The LSN Interface Chip The heart of the device is a specialized integrated circuit that handles communication with the fire alarm control panel. - **Data Transmission:** It sends the status of the switch (Alarm/Normal) and receives commands for the LED. - **Isolation:** It typically includes integrated short-circuit isolators to ensure that a fault in one device does not disable the entire loop. #### B. Addressing Mechanism (Rotary Switches) The device features manual rotary switches on the internal PCB. - **Manual Mode:** The technician sets the unique physical address of the device. - **Auto-Addressing:** If supported by the panel, the electronics allow for "plug-and-play" discovery based on the physical sequence on the loop. #### C. The Signaling LED A high-intensity red LED is integrated into the front electronics. - **Normal State:** Off. - **Alarm State:** Steady red (triggered by the panel once the switch closure is detected). - **Fault State:** May flash patterns depending on the panel's diagnostic capabilities. #### D. The Trigger Switch A micro-switch or magnetic reed switch (depending on the specific revision) detects the movement of the pull handle or the breaking of the glass element. When the contact state changes, the LSN chip sends an interrupt signal to the panel. --- ### 3. Connection Terminals The electronic board features a terminal block for loop wiring: ```markdown Terminal | Description ---------|----------------------------- LSN a/b | Incoming LSN bus wires LSN a/b | Outgoing LSN bus wires (to next device) Shield | Grounding/Shielding connection ``` --- ### 4. Key Advantages of the Electronics * **Low Power Consumption:** Minimal draw allows for up to 254 devices on a single loop. * **Maintenance Free:** The electronics perform self-diagnostics and report internal errors to the panel. * **Robustness:** Designed to operate in temperatures ranging from -10 °C to +55 °C.