The **M2CEC-110B-R2/Q** is an industrial-grade **M.2 to Dual Isolated CANBus expansion module**. It is typically used in embedded computing and industrial automation to add CAN (Controller Area Network) communication capabilities to a system via an M.2 slot. --- ### 1. Key Technical Specifications The module converts an M.2 interface into two independent, isolated CAN channels. | Feature | Specification | | :--- | :--- | | **Form Factor** | M.2 B-M Key 2280 | | **Interface** | PCIe 2.0 x1 | | **CAN Channels** | 2 Independent Channels | | **CAN Standard** | CAN 2.0 A/B (up to 1Mbps) | | **Isolation** | 2.5kV Optical Isolation | | **Operating Temp** | Standard: 0°C ~ 70°C / Wide: -40°C ~ 85°C | | **OS Support** | Windows, Linux (SocketCAN) | --- ### 2. Major Electronic Components The board utilizes several specialized ICs to manage data conversion and protection: * **CAN Controller (MCU/FPGA based):** Usually contains a dedicated logic chip that handles the PCIe-to-CAN bridge. This manages the buffering and timing of CAN frames. * **CAN Transceivers:** These are the physical interface chips that convert digital signals from the controller into the differential voltages used on the CAN bus wires. * **Digital Isolators:** High-speed optocouplers or magnetic isolators that provide **2.5kV isolation**. This protects the host computer from high-voltage spikes or ground loops occurring on the industrial equipment side. * **Termination Resistors:** Built-in 120Ω resistors, often selectable via jumpers or software, to ensure signal integrity at the ends of the CAN network. --- ### 3. Pinout and Connectivity The module usually outputs via a small header that connects to a DB9 cable. | Pin Number | Signal Name | Description | | :--- | :--- | :--- | | 1 | **CAN_L** | CAN Low Signal | | 2 | **CAN_H** | CAN High Signal | | 3 | **GND** | Isolated Ground | | 4 | **Term** | Optional Termination Link | --- ### 4. Applications * **Vehicle Diagnostics:** Connecting a PC to an automotive OBD-II system. * **Industrial Automation:** Communicating with PLCs, motor drivers, and sensors. * **Robotics:** Controlling actuators in a ROS (Robot Operating System) environment.