StarTech 2-Port Native PCI Express RS232 Serial Adapter Card with 16950 UART — PEX2S952

The StarTech PEX2S952 is a 2-port native PCI Express RS-232 serial adapter card featuring the high-performance 16950 UART. It adds two reliable RS-232 serial ports to any desktop PC with an available PCIe slot — ideal for connecting legacy serial devices, industrial equipment, and point-of-sale peripherals to modern systems that lack built-in serial ports.

Key Features

• Adds 2 native RS-232 serial ports via PCI Express
• High-performance 16950 UART with 128-byte FIFO buffers
• Supports data transfer rates up to 921.6 Kbps
• Low-profile bracket included for small form factor PCs
• Plug-and-play installation with broad OS support
• Native PCIe design — no bridge chip for lower latency

Product Specifications

• Part Number: PEX2S952
• Manufacturer: StarTech
• Model: 2-Port Native PCIe RS232 Serial Adapter Card
• OEM Status: Genuine StarTech OEM
• Bus Interface: PCI Express (PCIe) x1
• Compatible Slots: PCIe x1, x4, x8, x16
• Serial Ports: 2x DB9 RS-232
• UART: 16950 with 128-byte FIFO
• Max Baud Rate: 921.6 Kbps
• Brackets: Standard + Low-Profile included
• OS Support: Windows 10/11, Windows Server, Linux, macOS

Interface Specifications

• Bus Interface: PCI Express (PCIe) x1
• Compatible Slots: PCIe x1, x4, x8, x16
• UART: 16950 with 128-byte FIFO
• Max Baud Rate: 921.6 Kbps
• Signal Standard: EIA/TIA RS-232
• Native PCIe: Yes — no bridge chip

Port Specifications

• Number of Ports: 2x RS-232 Serial
• Connector Type: DB9 (9-pin)
• Brackets Included: Standard + Low-Profile
• OS Support: Windows 10/11, Windows Server, Linux, macOS

Use Cases

• Connecting legacy serial devices to modern PCs
• Industrial automation and machine control
• Point-of-sale terminal connectivity
• Serial console access for network equipment
• Data acquisition and instrumentation

Compatibility

• Compatible with any PCIe x1, x4, x8, or x16 slot
• Supports Windows 10/11, Windows Server, Linux, and macOS
• Works with RS-232 serial devices using DB9 connectors
• Includes standard and low-profile brackets for various chassis

Frequently Asked Questions

Does this card work in a PCIe x16 slot?

Yes, the PEX2S952 is compatible with PCIe x1, x4, x8, and x16 slots due to PCIe's backward compatibility.

Is a low-profile bracket included?

Yes, the PEX2S952 includes both a standard and a low-profile bracket for full-size and small form factor desktop PCs.

What operating systems are supported?

The PEX2S952 supports Windows 10/11, Windows Server editions, Linux, and macOS with appropriate drivers.

The StarTech PEX2S952 is the go-to solution for adding reliable native RS-232 serial connectivity to modern desktop systems. Whether for industrial, POS, or legacy device support, it delivers dependable low-latency performance in a compact PCIe form factor.