Features: Enhanceds your connectivitys with 2/4Port DB9 RS422/485 Serial PCIExpress2.0 x1 Card, to deliver high performances serial communication for both home and industrial applications. This card features XR17V358 series Multiple I/O PCIE controller, for the industry standards 16C550 UART, ensuring reliable and cost effective connection for industrial machines. for engineers and IT professional, this expansion card for those needing to integrate multiple serial devices into their systems seamlessly. Whether in factory setting or home workshop, this card supports asynchronous full duplex communication over twisteds pair or shielded cable, making for various. with automatic IRQ and I/O address allocation, and builts in DCDC isolation power, this card ensures easy installation and superior protections against ground interferences. Specifications: Materials: Metal Styles: 2Port, 4Port(optional) Szie:9.6x5.6x1.8cm/3.78x2.2x0.71inch Package Includes: 1PC RS422/485 Serial Card note: Please allow 1-3cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.