The **MTN6125-R** is a specific electronic component from the **Schneider Electric SpaceLogic KNX** range. It is technically classified as a **KNX Binary Input 4-gang (4 x 230 V)**. This device acts as an interface to connect conventional 230V switches or sensors to a KNX building automation bus system. --- ## 1. Technical Specifications Below are the primary electronic characteristics of the MTN6125-R: | Feature | Specification | | :--- | :--- | | **Bus Type** | KNX (TP - Twisted Pair) | | **Input Channels** | 4 Independent Channels | | **Input Voltage** | 230 V AC (50/60 Hz) | | **Logic Level "0"** | < 40 V AC | | **Logic Level "1"** | > 160 V AC | | **Input Current** | Approx. 2 mA | | **Power Supply** | Via KNX Bus (~24V DC) | | **Mounting** | DIN Rail (EN 60715) | --- ## 2. Key Electronic Components & Interfaces ### A. Input Stage (High Voltage) The device contains internal optocouplers to provide **galvanic isolation** between the 230V AC inputs and the sensitive 24V DC KNX bus. This prevents electrical surges on the mains side from destroying the automation network. ### B. Microcontroller Unit (MCU) The "brain" of the MTN6125-R processes the signals from the inputs. It handles: * **Debouncing:** Ensuring that mechanical contact "chatter" isn't interpreted as multiple signals. * **Logic Processing:** Determining if a press is "Short" or "Long." * **Communication:** Formatting data into KNX telegrams. ### C. KNX Bus Connector A standard red/black bus terminal connects the device to the KNX line. The device draws its operating power directly from this bus, requiring no external low-voltage power supply. --- ## 3. Functional Logic The electronic firmware allows the four inputs to be configured for various tasks: 1. **Switching:** Turning lights/circuits ON or OFF. 2. **Dimming:** Sending "Start" and "Stop" telegrams based on press duration. 3. **Blind Control:** Managing the movement and slat adjustment of motorized shutters. 4. **Pulse Counting:** Acting as an interface for meters that output 230V pulses. --- ## 4. Wiring Diagram Concept Internally, the wiring follows this logic: ```text [ 230V Mains ] ----> [ Input Channel 1-4 ] ----> [ Optocoupler ] | [ KNX Bus ] <------- [ Microcontroller ] <-------------| ``` --- ## 5. Physical Indicators * **Programming LED:** Indicates when the device is in "addressing mode." * **Status LEDs:** Usually, these devices feature LEDs for each input to show the current logic state (High/Low) of the 230V signal.