Key benefits Enables seamless integration of multiple serial devices into existing systems Flexible 2port or 4port RS422/485 serial expansion via PCI Express 2.0 Reliable operation with XR17V358 series multiple I/O PCIe controller and industry standard 16C550 UART Simple installation with automatic IRQ address allocation Builtin DCDC isolation power provides electrical isolation and enhanced protection against ground interference Suitable for both home and industrial applications requiring robust serial communication What it is A PCI Express 2.0 expansion card designed for engineers and IT professionals who need to connect several serial devices. It supports 2port and 4port RS422/485 configurations and uses the XR17V358 series I/O controller for dependable performance while remaining compatible with the standard 16C550 UART framework. Key features RS422/RS485 serial ports: available in 2port or 4port configurations Controller: XR17V358 series Multiple I/O PCIe controller UART compatibility: industry standard 16C550 UART IRQ handling: automatic IRQ address allocation Power isolation: builtin DCDC isolation power Ground interference protection: designed to reduce noise and groundrelated issues Interface: PCI Express 2.0 card Technical specifications Card interface: PCI Express 2.0 Serial ports: RS422/RS485, 2port or 4port variants I/O controller: XR17V358 series UART standard: 16C550 compatible IRQ management: automatic allocation Isolation: builtin DCDC isolation power Protection: enhanced protection against ground interference Installation and usage notes Designed for straightforward installation with automatic IRQ addressing Provides isolated power to help protect connected equipment and improve signal integrity Suitable for use in professional IT, engineering, and industrial environments that rely on reliable serial communication Use scenarios Industrial automation and control: connect multiple RS422/RS485 field devices to a PC for monitoring, control, or data collection Data acquisition and logging: aggregate data from several serial instruments into a single workstation for analysis and archival Edge gateway or embedded systems: extend serial I/O in environments where electrical isolation and noise reduction are important This description aligns with the XR17V358 series controller, 16C550 UART compatibility, automatic IRQ allocation, DCDC isolation power, and RS422/RS485 2port or 4port PCI Express 2.0 card specifications as provided.