2/4-Port DB9 RS422/485 Serial PCIe Card (PCIExpress2.0 x1) — XR17V358 / 16C550 UART

Add reliable, high-performance serial connectivity to desktops or industrial systems with this 2/4-Port DB9 RS422/485 Serial PCIExpress2.0 x1 expansion card. Built around the XR17V358 series Multiple I/O PCIE controller and compliant with the industry-standard 16C550 UART, it provides a cost-effective, robust interface for connecting multiple serial devices and industrial machines. The card supports asynchronous full duplex communication over twisted pair or shielded cable, making it suitable for factory floors, workshops, and lab environments. Installation is simplified by automatic IRQ and I/O address allocation, while built-in DCDC isolation power helps protect against ground interference. Ideal for engineers and IT professionals who need to integrate several RS422/485 devices into a single system.