The **M2PRU-H7R-R2** is a specialized M.2 hardware module typically used in industrial computing and automation. It is part of Advantech’s line of expansion modules, specifically designed as a **Power Recovery Unit (PRU)** in an M.2 form factor. Below is a breakdown of its electronic components, functions, and specifications. --- ### 1. Core Functionality The primary purpose of this module is to provide **OOB (Out-of-Band) Management** and power control. It allows administrators to remotely reset, power on/off, or monitor a system even if the primary Operating System has crashed or the CPU is unresponsive. ### 2. Key Electronic Components | Component Type | Description | | :--- | :--- | | **Form Factor** | M.2 2230 (A-E Key), utilizing the PCIe or USB signaling interface. | | **Microcontroller** | An onboard low-power MCU that handles the logic for power sequencing and signal interpretation. | | **Relay/Switch Logic** | Solid-state switching components that interface with the motherboard's Front Panel header (Power Button/Reset Button pins). | | **Connectivity Pins** | Physical headers (usually 2-pin or 4-pin) used to bridge the module to the motherboard's power/reset jumpers. | | **Voltage Regulators** | DC-to-DC converters that step down the M.2 slot's 3.3V supply to the logic levels required by the MCU. | --- ### 3. Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Interface** | M.2 (USB 2.0 or PCIe signals for communication) | | **Output Interface** | Discrete wires for Power/Reset/HDD LED headers | | **Control Logic** | Supports Remote Power On, Force Reset, and Power Status monitoring | | **Operating Temp** | Typically industrial grade (-20°C to +70°C or wider) | | **Software Support** | Integrated with Advantech WISE-DeviceOn or similar remote management SDKs | --- ### 4. Hardware Implementation Logic The "R2" designation usually implies a second revision of the hardware, often improving power efficiency or compatibility with newer BIOS versions. * **Remote Power Management:** The module intercepts the power signal. When a remote command is sent via the network (through the host's LAN or a dedicated bridge), the M2PRU triggers the electronic equivalent of a physical button press. * **Watchdog Integration:** It often includes a hardware watchdog timer that can automatically trigger a "Hard Reset" if it stops receiving a "heartbeat" signal from the software. --- ### 5. Wiring Diagram Concept ```text [ Motherboard ] [ M2PRU-H7R-R2 ] [ Remote Server ] | | | PW_SW Header <---------- [ Signal Relay ] | | | | M.2 Slot <-------------- [ MCU / USB ] <----------- [ Network/OS ] ``` ---