2 or 4 port RS422/485 serial PCI Express 2.0 card delivering performance serial communication for both home and industrial applications. Automatic IRQ address allocation and built in DCDC isolation power provide easy installation and robust protection against ground interference. Features XR17V358 series multi IO PCIe controller with industry standard 16C550 UART compatibility, delivering cost effective connections for industrial machines. Designed for engineers and IT professionals who need to integrate multiple serial devices into their systems seamlessly. Key attributes Port options: 2 or 4 RS422/485 serial ports Interface: PCI Express 2.0 Controller: XR17V358 series multi IO PCIe controller UART compatibility: 16C550 standard Protection: built in DCDC isolation power and ground interference protection Convenience: automatic IRQ address allocation 23 practical use scenarios Industrial automation: connect PLCs, sensors, motor controllers, and other RS48