Startech2-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card PEX2S953LP (Lifetime Warranty)

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StarTechSKU: PEX2S953LP
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Sale price$ 92.00 SGD Regular price$ 99.00 SGD


Startech2-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card PCIe to Serial DB9 - 16950 UART - Low Profile Expansion Card - Windows & Linux PEX2S953LP (Lifetime Warranty)

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.

      • 2 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 2x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer & 9th data bit; Upgraded version of our popular card PEX2S952LP

      • OPTIONAL CONFIGURABLE POWER: PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 2 ports are individually configurable

      • LOW PROFILE BRACKETS PRE-INSTALLED: PCIe multiport serial card comes w/ a low profile bracket preinstalled & a full profile bracket is incl for versatile install; supports Windows XP and up & Linux

      • VERSATILE APPLICATIONS: For standard/low profile desktop/servers w/ uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope

      • STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCIe RS232 Serial expansion card is backed for life by, incl. free 24/5 North America based multi-lingual tech support

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


  • Install in home or office workstations
  • Connect in retail POS applications
  • Connect to automated self-service kiosks or ATM machines
  • Interact with RS232 serial devices like card readers or printers

PEX2S953LP is backed by a lifetime warranty and free lifetime technical support.


  • Windows 8
  • Windows Server 2012
  • Linux
  • Windows 7
  • Windows Server 2016
  • Windows 10
  • Windows 11
Windows® 7, 8, 8.1, 10, 11
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016
Linux 2.4.x to 2.6.x LTS Versions only


Warranty Information

Connector Type(s)
1 - PCI Express x1
Internal Ports
1 - LP4 (4 pin; Large Drive Power)
External Ports
2 - DB-9 (9 pin, D-Sub)

Operating Temperature
-10°C to 80°C (14°F to 176°F)
Storage Temperature
-20°C to 100°C (-4°F to 212°F)
5~85% RH

Bus Type
PCI Express
Card Type
Low Profile (SP bracket incl.)
Port Style
Integrated on Card
Chipset ID
Asix AX99100

Packaging Information
Package Height
1.3 in [32.0 mm]
Package Length
6.8 in [17.2 cm]
Shipping (Package) Weight
10.4 oz [295.0 g]
Package Width
5.6 in [14.2 cm]

Serial Protocol
Max Baud Rate
921.6 Kbps
Data Bits
5, 6, 7, 8, 9
256 Bytes
Flow Control
None, Xon/Xoff, RTS/CTS
None, Odd, Even, Space, Mark
Stop Bits
1, 1.5, 2
222,366 hours

Physical Characteristics
Product Height
3.1 in [8.0 cm]
Product Length
4.1 in [105.0 mm]
Weight of Product
3.4 oz [95.0 g]
Product Width
0.9 in [22.0 mm]

OS Compatibility
Windows® 7, 8, 8.1, 10, 11
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016
Linux 2.4.x to 2.6.x LTS Versions only
Microsoft WHQL Certified

Special Notes / Requirements
Selectable power output on pin 9 of the serial port

What's in the Box
Included in Package
1 - PCIe Serial Card

2 - Low Profile Brackets (Installed)

1 - Full-Profile Bracket

1 - User Manual

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