StarTech 4-port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9 Controller Card 16950 UART - Low Profile - Windows/Linux (pex4s953lp)

This item is brand-new, factory sealed.

4 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 4x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer

OPTIONAL CONFIGURABLE POWER: PCIe multiport serial card provides 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 4 ports are individually configurable; DB44 to 4x DB9 breakout cable incl

STANDARD PROFILE & LOW PROFILE BRACKET: PCI Express RS232 serial adapter card has low profile bracket pre-installed & 1x standard bracket incl for versatile install; Supports Windows XP and up & Linux


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 HARDWARE Bus Type
PCI Express Card Type
Standard Profile (LP bracket incl.) Chipset ID
Asix AX99100 Interface
Serial Port Style
Integrated on Card Ports
4 PERFORMANCE Data Bits
5, 6, 7, 8, 9 FIFO
256 Bytes Flow Control
None, Xon/Xoff, RTS/CTS Max Baud Rate
921.6 Kbps MTBF
214,358 hours Parity
None, Odd, Even, Space, Mark Serial Protocol
RS-232 Stop Bits
1, 1.5, 2 CONNECTOR(S) Connector Type(s)
1 - PCI Express x1 Male External Ports
4 - DB-9 (9 pin, D-Sub) Male Internal Ports
1 - LP4 (4 pin, Large Drive Power) Male Input

Package Contents:

• 4-Port PCI Express RS232 Serial Adapter Card - 16950 UART - Low Profile
• 1 x 4-Port DB9 Break-out Cable
• 1 x Full Profile Bracket
• 1 x Quick-Start Guide