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StarTech 4-Port PCIe RS232 Serial DB9 Adapter Card PEX4S953

VENDOR: STARTECH Mfg Part#: PEX4S953 UPC#: 065030888257
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$108.11
$108.11
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MSRP: $115.99
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  • 4-port RS-232 DB9 serial interface via PCI Express for legacy device support
  • Bi-directional data speeds up to 921.6 Kbps per port with 256-byte FIFO buffer
  • Selectable pin 9 power output (5V, 12V, or none), total power up to 2A
  • ASIX AX99100 chipset ensures compatibility and high-performance throughput
  • Includes standard and low-profile brackets for flexible system installation
  • Lifetime warranty and TAA compliance for government and commercial use

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Key Benefits

Eye-Insights
  • Offers high-speed, bi-directional serial connectivity for up to four devices via one PCIe slot, boosting efficiency and reducing expansion overhead.
  • Built-in voltage selection per port (up to 2A shared) supports a wide range of powered serial equipment without external adapters.
  • Includes full and low-profile brackets plus cross-platform support (Windows/Linux), enabling seamless deployment across varied hardware setups.

Product Overview

4 port PCI Express RS232 serial controller card w/16950 UART/ASIX AX99100 - Bi-directional speeds 921.6Kbps/port / 256 byte FIFO / 9th data bit - Pin 9 pwr out 5v/12v/none w/up to 2A total - Std bracket (low profile incl); Breakout cable - Win/Linux

Specifications

Product Overview
Product Type Serial Adapter Card
Form Factor Plug-In Card
Chipset ASIX AX99100
UART Type 16950 UART
FIFO Buffer 256 byte FIFO per port
Maximum Data Rate 921.6 Kbps per port
Bracket Type Standard profile (low profile bracket included)
External Cable Breakout cable for 4 x DB9 serial ports
Weight 76 g
Power Output on Pin 9 Selectable 5V / 12V / None (up to 2A total)
Operating System Support Windows, Linux

Physical & Environmental
Dimensions (W x D x H) 120 mm x 92 mm x 18 mm
Operating Temperature 0°C to 55°C (32°F to 131°F)
Storage Temperature -20°C to 85°C (-4°F to 185°F)
Humidity (Operating) 5% to 95% RH (non-condensing)

Cloud Management & Licensing
Management Interface
Cloud-based Management
Included Licensing

Interfaces
Interface Type PCI Express 1-lane (PCIe x1)
Port Type DB9 male
Number of Ports 4
Compatible Slot PCI Express x1, x4, x8, x16
Serial Protocol RS-232
Connectivity Technology Wired

Compliance & Origin
TAA Compliant Yes
Country of Origin Taiwan
Certifications CE, FCC, RoHS, REACH

Advanced Security Features
Integrated Security
Surge Protection 15kV ESD protection on all signal lines
Isolation None