PCI Express to Serial Adapter 921.4Kbps Windows and Linux Compatible. This RS232 Serial Adapter Card lets you add an RS232 DB9 serial port to your computer through a PCI Express (PCIe) slot. It enables you to interact with serial devices such as card readers, printers, PIN pads, and modems, at speeds of up-to 921.4Kbps. Maximum Compatibility. With broad OS support, including for Windows and Linux, this PCI Express card is easy to integrate into mixed environments. The card comes pre-configured with a low-profile bracket, and includes an optional full-profile bracket, so installation is easy regardless of the case form factor. Experience Optimal Technology. This PCIe to serial adapter supports the following features:. Compatible with industry standard 16950 UART. Supports max baud rate of up-to 921.4Kbps. Provides 5/12V power output on Pin 9 when external power is connected. 128-byte depth FIFO per transmitter and receiver. Supports 9, 8, 7, 6, 5 data bits. Asix AX99100 chipset. PCI Express 1.1 compliant. PEX1S953LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.