2/4Port RS422/485 Serial PCIe Expansion Card with XR17V358 Controller and 16C550 UART Key benefits Enables seamless integration of multiple serial devices into existing systems, reducing wiring complexity and expanding compatibility. Supports asynchronous full duplex communication over twisted pair or shielded cable, suitable for demanding environments on the factory floor or in a home workshop. Uses the XR17V358 series Multiple I/O PCIe controller with an industrystandard 16C550 UART, delivering reliable, costeffective connections for industrial machines and equipment. What this card provides PCI Express 2.0 interface for a straightforward expansion of serial I/O 2port or 4port RS422/485 serial capability to fit varying device counts Industrystandard 16C550 UART compatibility for broad device support Robust serial performance suitable for industrial and home workshop applications Designed for use in factory settings or workspaces requiring dependable serial communications Specifications at a glance Controller: XR17V358 series Multiple I/O PCIe controller UART compatibility: 16C550 UART Ports: 2 or 4 RS422/485 Interface: PCI Express 2.0 Cable options: supports asynchronous full duplex over twisted pair or shielded cable Use scenarios Industrial automation and control: connect PLCs, sensors, remote I/O, and other RS422/RS485 devices to a single PC for data collection, monitoring, and control. Laboratory and data acquisition: link measurement instruments and data loggers to a workstation for experiments, testing, and logging. Small business and workshop: integrate serial peripherals such as barcode scanners, CNC controllers, or other serial equipment with a PC for streamlined operations. Notes on compatibility and deployment Fits standard PCI Express slots and supports 2port or 4port RS422/RS485 configurations. Suitable for both factory environments and home workshops where reliable serial communication is required. Maintains compatibility with industrystandard 16C550 UARTbased devices, enabling costeffective integration with a wide range of serial equipment.