PCIExpress2.0 x1 2/4-Port DB9 RS422/485 Serial Card — XR17V358 Controller, 16C550 UART, Asynchronous Full-Duplex

Upgrade your system with this PCIExpress2.0 x1 2/4Port DB9 RS422/485 serial expansion card, designed for both industrial and home use. It is built on the XR17V358 series Multiple I/O PCIE controller and supports the industry-standard 16C550 UART to provide reliable, cost-effective serial communications. The card enables asynchronous full duplex data transfer over twisted-pair or shielded cable, making it suitable for factory environments or workshop setups where multiple serial devices must be connected. Installation is straightforward thanks to automatic IRQ and I/O address allocation, and built-in DCDC isolation power helps protect against ground interference. A practical choice for engineers and IT professionals requiring high-performance, multi-port serial integration.