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StarTech.com PEX4S953LP 4-Port PCI Express RS232 Serial Adapter Card - 16950 UART - 256-byte FIFO Cache - ASIX AX99100 - Low Profile Bracket - Replacement for PEX4S952LP (PEX4S953LP)
- 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 replacement for the PEX4S952LP serial card enables you to interact with serial devices such as printers and modems
- The 4-port serial PCIe card provides a max baud rate of up to 921.6Kbps and 256-byte FIFO cache with the Asix AX99100 chipset
- The low profile PCI E serial card is easy to integrate into many environments with support for Windows and Linux
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Overview
Specs
Reviews
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 1 year
- Limited Warranty period (labor): 1 year
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.ca's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-800-265-1844
- Support Email: support@startech.com
- Support Website
- View other products from STARTECH
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The StarTech.com PEX4S953LP is a PCIe expansion card that adds four RS232 DB9 serial ports, making it suitable for IT teams and system integrators connecting serial equipment such as printers, modems, card readers, or PIN pads to a Windows or Linux computer with an available PCIe slot.
Recommended For
- Desktop or server operators connecting several RS-232 devices at once—such as POS peripherals, scanners, or card readers—who want four DB9 ports from one PCIe slot.
- Factory and automation technicians adding serial connections to a desktop or server used with RS-232 PLCs or control equipment.
- CNC or machine-tool operators whose existing equipment communicates over RS-232 and whose control PC has an available PCIe slot; community discussions note that some legacy setups can be sensitive to the serial adapter and connection details.
- Lab or measurement-system users connecting RS-232 instruments, such as sensors or oscilloscopes, to a fixed desktop or server and needing multiple serial ports.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Adding four RS-232 serial connections to a computer for use with printers, PIN pads, modems, and other serial devices |
| Interface And Ports | PCI Express card with four male DB-9 RS-232 ports and one 4-pin LP4 power input |
| Serial Performance And Configuration | ASIX AX99100 chipset, up to 921.6 Kbps, and 256-byte FIFO per transmitter and receiver; supports 5–9 data bits, 1, 1.5, or 2 stop bits, none/odd/even/space/mark parity, and none/Xon/Xoff/RTS/CTS flow control |
| Operating System Compatibility | Supports Windows 7, 8, 8.1, and 10; Windows Server 2003, 2008 R2, 2012, 2012 R2, and 2016; and Linux 2.4.x to 2.6.x LTS versions |
| Physical Fit And Dimensions | Low-profile bracket pre-installed; full-profile bracket included. Measures 3 × 2.5 × 0.7 inches and weighs 0.58 lb |
| Included Accessories | Includes a 4-port DB9 breakout cable, full-profile bracket, and quick-start guide |
| Model Identifiers | StarTech.com PEX4S953LP; PCI Express 1.1-compliant replacement for the PEX4S952LP |