2/4 Port RS422/485 Serial PCI Express 2.0 Card This PCI Express 2.0 card provides 2 or 4 RS422/485 serial ports and uses the XR17V358 series Multi I/O PCIe controller with industry standard 16C550 UART support. It enables asynchronous full duplex communication over twisted pair or shielded cable, making it suitable for building reliable serial networks in both home workshops and industrial environments. Key benefits Flexible 2/4 port configuration for scalable serial I/O on a single PCIe card. Easy installation with automatic IRQ address allocation, reducing system setup time. Builtin DCDC isolation power to protect against ground interference and improve signal integrity. Supports asynchronous full duplex RS422/485 communication over twisted pair or shielded cable for robust data transmission. Costeffective, industrystandard UART compatibility (16C550) with XR17V358 series controller for reliable connections to industrial devices. Key attributes Interface: PCI Express 2.0 Ports: 2 or 4 RS422/485 serial ports Controller: XR17V358 series Multi I/O PCIe controller UART compatibility: industrystandard 16C550 UART Protection: builtin DCDC isolation power for ground interference mitigation Communication: asynchronous full duplex over twisted pair or shielded cable Installation: automatic IRQ address allocation Applications and use scenarios Industrial automation and control systems: connect PLCs, motor drives, and Modbus RTU devices requiring reliable RS422/485 serial communication. Data acquisition and machine monitoring: attach multiple sensors, meters, or thirdparty instruments to an industrial PC or embedded system for logging and analysis. Home workshop and smallscale electronics projects: provide robust serial connectivity for CNC controllers, hobbyist automation, or test benches that demand isolated power and dependable RS422/485 links.