The X-series I/O board is a specialized signal expansion board designed for the ARMxy series of Arm-Based Single Board Computers. It connects directly to the motherboard of the ARMxy series ARM Based SBC industrial computers via pin headers, offering a wide range of signal interfaces, including RS485, RS232, DI, DO, relay outputs, PWM, pulse counting, GPIO, and more. When standard models do not meet specific requirements, it allows for rapid custom development based on user needs without the need for a complete redesign of the ARM industrial computer system. The X-series I/O board features an isolated design, complies with EMC and EMI standards, and ensures stable and reliable performance.