The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1-to-4 cable enabling you to add 4 serial ports to a single low profile slot.
The serial card features a native single-chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge-chip serial cards - a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers.
The multi-port serial adapter includes both full profile and low profile/half-height brackets for compatibility with standard and small form factor computers, and is compatible with a broad range of operating systems, including Windows®, Linux, and MAC OS.
This product is a replacement for our PEX4S552B card.
Backed by a StarTech.com lifetime warranty and free lifetime technical support.
Connector(s) | |
Connector Type(s) | PCI Express x1 Male |
External Ports | DB-9 (9 pin, D-Sub) Male |
Environmental | |
Humidity | 5~85% RH |
Operating Temperature | 0?C to 70?C (32?F to 158?F) |
Storage Temperature | -40?C to 85?C (-40?F to 185?F) |
Hardware | |
Bus Type | PCI Express |
Card Type | Low Profile (SP bracket incl.) |
Chipset ID | ASIX/MosChip - MCS9904CV-AA |
Interface | Serial |
Port Style | Dongle (Included) |
Ports | 4 |
Packaging Information | |
Shipping (Package) Weight | 0.3 kg [0.7 lb] |
Performance | |
Data Bits | 5, 6, 7, 8 |
FIFO | 256 Bytes |
Max Baud Rate | 230.4 Kbps |
Parity | Even, Odd, None, Space and Mark |
Serial Protocol | RS-232 |
Physical Characteristics | |
Product Height | 68.5 mm [2.7 in] |
Product Length | 80.5 mm [3.2 in] |
Product Weight | 50 g [1.8 oz] |
Product Width | 12 mm [0.5 in] |
Software | |
Microsoft WHQL Certified | Yes |
OS Compatibility | Windows? DOS, 95, 98SE, 2000, CE 5.0/6.0, Embedded System 2009, POS Ready 2009, XP Embedded, XP, Vista, 7, 8, 8.1, 10 Windows Server? 2003, 2008 R2, 2012, 2012 R2, 2016 Mac OS? 10.4 to 10.10 Linux 3.5.x to 4.4.x LTS Versions Only |
What's in the Box | |
Included in Package | 4 Port PCI-Express Serial Card |
Breakout cable | |
Driver CD | |
Full profile bracket | |
Instruction Manual |
Ports & interfaces
Design

Features
Operational conditions
System requirements

Weight & dimensions
Packaging data



Other features
SKU | 210924 |
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MPN | PEX4S553B |
Brand | Startech |
Product Condition | Brand New/Unused |
Stock Availability | Available for Shipping |
Warranty Period | Limited Lifetime Warranty |
Warranty Contact | https://www.startech.com/ |