Range/Series Overview
IMPORTANT: This Range/Series overview section describes the range of which this product belongs. Features of different versions might be mentioned and may not apply to the specific product on this page. Please view Specs for specification of product.PCI Express to Serial Adapter 921.4Kbps Windows and Linux Compatible. This RS232 Serial Adapter Card lets you add two RS232 (DB9) serial ports 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
256-byte depth FIFO per transmitter and receiver
Supports 9, 8, 7, 6, 5 data bits
Asix AX99100 chipset
PCI Express 1.1 compliant
PEX2S953LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.
Features Summary
- Enhanced connectivity
This 2-port PCI Express RS232 Serial Adapter Card offers seamless connectivity with its two 9-pin D-Sub (DB-9) RS-232 ports, enabling efficient connection to a wide range of serial devices. - High-speed data transfer
Experience rapid data communication with a data transfer rate of up to 921.6 Kbps, facilitated by a 256-byte FIFO and full duplex mode. This ensures swift and reliable data transmission for all connected devices. - Broad compatibility
Designed to support a variety of operating systems, this PCIe to Serial DB9 COM Ports card is compatible with Windows, macOS, and Linux, offering versatile use across different platforms. - Durable and compliant
Built to last, the card adheres to FCC, RoHS, WEEE, and WHQL standards, ensuring a reliable and environmentally friendly solution for expanding your system's serial capabilities.
Specification Summary
Product Description
Startech 2-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9 COM Ports, 16950 UART, Low Profile Expansion Card, Windows/macOS/Linux - Full/Low-Profile (PEX2S953LP) - serial adapter - PCI Express x1 - RS-232 x 2
Device Type
Serial adapter
Form Factor
Plug-in card - low profile
Interface (Bus) Type
PCI Express x1
PCI Specification Revision
PCIe 1.1
Dimensions (WxDxH)
6.7 cm x 9.8 cm x 1.8 cm
Data Link Protocol
RS-232
Data Transfer Rate
921.6 Kbps
System Requirements
Microsoft Windows Server 2003, Microsoft Windows Server 2008 R2, Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows Server 2016, Linux 2.4 - 2.6.x
Manufacturer Warranty
Limited lifetime warranty