MCS9922 Chipset Compatible with Industrial Standard 16C550 UART. On Chip 256-byte Depth FIFO in Transmit. Transfer Data Rates up to 250Kbps on Each Port. Supports Hardware and Software Flow Control. Supports 5, 6, 7, 8-bit Serial Format Fully Compliant with PCI-Express Base Specification Revision 1.0a Single-Lane (x1) PCI-Express with Throughput up to 2.5Gbps Syba Single Port RS-232 RS-422 RS-485 DB9 Serial PCI-Express Designed by Syba, the Syba Single Port RS-232 RS-422 RS-485 DB9 Serial PCI-Express 2.0 x1 Card is built for lasting quality and everyday use. Shop at OJCommerce and explore our collection with free shipping on every order.