This IoT card provides RS485 interface, equipped with automatic flow control for efficient data handling and terminating resistor enabled via DIP switch to ensure impedance match across long distances. Designed with flexibility in mind, the card includes an addON expansion module connector, enabling further customization by allowing additional modules and peripherals to be integrated. This feature makes the card particularly valuable for developers and engineers who need scalable solutions for industrial and IoT applications, smart buildings, and other data-intensive environments, as it allows seamless adaptation to diverse project requirements. Dedicated aluminum cover provide robust protection when the card is installed in FX30/FX30S gateways.