4 Port PCI Express RS232 Serial Adapter Card - L... 4 Port PCI Express RS232 Serial Adapter Card - Low Profile
17 in stock
Standard: 1-3 working days
Key features
  • Add RS232 DB9 capabilities without purchasing a new server or computer
  • PCI Express 1.1 compliant, ensuring wide compatibility
  • Maximize case form factor integration with a low-profile or full profile brackets
  • Supports 256-byte depth FIFO cache per transmitter and receiver
  • High-speed data transfer rates of up to 921.6Kbps
Product overview
  • Wired / Wireless: Wired
  • Protocol: RS-232
  • Type: Serial adapter
Product codes

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Product Description


PCI Express to Serial Adapter 921.6Kbps Windows and Linux Compatible. This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets, and includes

optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.

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 921.6Kbps

Provides 5/12V power output on Pin 9 when external power is connected

256-byte depth FIFO cache per transmitter and receiver

Supports 9, 8, 7, 6, 5 data bits (one per port)

Asix AX99100 chipset

PCI Express 1.1 compliant

The Choice of IT Pros Since 1985 conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local Technical Advisors have broad product expertise and work directly with our Engineers to provide support for our customers both pre and post-sales.

PEX4S03LP is backed by a lifetime warranty and free lifetime technical support.



Product Description 4-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9, 16950 UART, Low Profile Desktop Expansion Card, Windows, macOS, Linux - Full/Low-Profile (PEX4S953LP) - serial adapter - PCIe - RS-232 x 4
Device Type Serial adapter
Form Factor Plug-in card - low profile
Interface (Bus) Type PCI Express x1
PCI Specification Revision PCIe 1.1
Ports RS-232 x 4
Dimensions (WxDxH) 6.3 cm
Data Link Protocol RS-232
Data Transfer Rate 921.6 Kbps
Processor ASIX AX99100
System Requirements Microsoft Windows Server 2003, Microsoft Windows Server 2008 R2, Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows 7 / 8 / 8.1 / 10, Microsoft Windows Server 2016, Linux 2.4.x - 2.6.x LTS versions only
Manufacturer Warranty Limited lifetime warranty



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