The **M2XF2-S2V2-R** is a specific model identifier typically associated with **IEI Integration Corp** for their industrial-grade M.2 expansion modules. This specific part is an M.2 to PCIe expansion card designed to add connectivity (usually Serial ports) to an industrial motherboard or embedded system. --- ### 1. Technical Specifications Table | Feature | Description | | :--- | :--- | | **Form Factor** | M.2 B+M Key (2242 or 2280 size) | | **Interface** | PCIe 2.0 x1 | | **Expansion Type** | Serial Communication Card | | **Port Count** | 2-Port RS-232/422/485 | | **Controller** | EXAR XR17V352 (Commonly used in this series) | | **Operating Temp** | -20°C to +70°C (Standard Industrial) | | **Isolation/Protection** | 2kV Isolation (depending on sub-revision) | --- ### 2. Key Electronic Components The "Electronic Parts" of this module consist of several critical sub-systems: #### A. The Bridge Chip (ASIC) The heart of the module is usually an **Exar (MaxLinear) XR17V352** or similar PCIe-to-UART bridge. * **Function:** It converts the high-speed PCIe differential signals from the M.2 slot into standard UART logic levels. * **Buffer:** Includes high-depth FIFOs (256-byte) to prevent data loss during high-speed transmissions. #### B. Transceiver Circuitry Since logic-level UART cannot travel over long cables, the board includes **Transceiver ICs** (like the SP336 or similar multi-protocol chips). * **RS-232 Mode:** Pumps voltage up to +/- 5V or 12V. * **RS-422/485 Mode:** Converts signals to differential pairs for noise immunity over long distances. #### C. Power Management (LDOs/Regulators) The M.2 slot provides 3.3V. The board contains **Low Dropout Regulators (LDO)** to step down or stabilize voltages for the internal controller and the transceivers. #### D. Signal Protection To survive industrial environments, the module includes: * **TVS Diodes:** Protects against Electrostatic Discharge (ESD). * **Termination Resistors:** 120-ohm resistors (often jumper-selectable) for RS-485 stability. --- ### 3. Pinout and Connectivity The "S2V2" suffix in the model name generally refers to the specific configuration: * **S2:** 2 Serial Ports. * **V2:** Version 2 hardware revision. The connection to the external world is usually via a **wafer connector** (like a 10-pin Hirose or JST) on the M.2 board, which then connects to a DB9 cable. ---