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Star Tech PEX2S553 2 Port Native PCI Express RS232 Serial Adapter Card with 16550

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Star Tech PEX2S553 2 Port Native PCI Express RS232 Serial Adapter Card with 16550

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 Product Overview

The PEX2S553S 2-Port PCI Express Serial Card lets you add two ESD-Protected RS232 ports with 5V or 12V selectable power output, through a PCI Express slot.

Ideal for industrial environments, this 2-port serial card offers built-in 15KV ESD-protection which helps prevent damage to connected devices in the event of line surges and electro-static discharge. An extended operating temperature range (-30°C to 75°C) also helps to ensure performance in harsh environments.

For devices that require additional power, this serial controller has a jumper-selectable 5V or 12V power output option (pin 1 and/or pin 9), through an LP4 connection to your power supply. For added flexibility, the power output can be enabled or disabled on a per-port basis so you choose which port(s) supply power.

This versatile RS232 card supports high-speed serial data rates up to 921.6 Kbps, and is compliant with PCIe Gen 2.0 specifications for added bandwidth. To maximize installation options, the 2-port card is equipped with a standard profile bracket and includes an optional low-profile/half-height bracket for installation in small form factor computers.

Product Specifications

Warranty Information



Physical Characteristics

Product Height

3.9 in [98 mm]

Product Length

4.8 in [121 mm]

Product Weight

2.1 oz [59 g]

Product Width

0.7 in [18 mm]


Bus Type

PCI Express

Card Type

Standard Profile (LP bracket incl.)

Chipset ID

Exar - XR17V352

Industry Standards

PCI Express Base Specification 2.0



Port Style

Integrated on Card




Data Bits

5, 6, 7, 8


256 Bytes

Flow Control

None, Xon/Xoff, RTS/CTS, DTR/DSR

Max Baud Rate

921.6 Kbps


Even, Odd, Mark, Space, None

Serial Protocol


Stop Bits

1, 1.5, 2

Surge Protection



Connector Type(s)

1 - PCI Express x1 Male

External Ports

2 - DB-9 (9 pin; D-Sub) Male


OS Compatibility

Windows 10 (32/64), 8 / 8.1 (32/64), 7 (32/64), Vista (32/64), XP (32/64), 2000
Windows Server 2012, 2008 R2, 2003
Linux 3.0, 2.6.32, 2.6.31, 2.6.27, 2.6.16

Special Notes / Requirements

System and Cable Requirements

Available PCI Express slot


Available LP4 power supply connector (if additional power is required for connected devices)



5~95% RH (Non-Condensing)

Operating Temperature

-30°C to 75°C (-22°F to 167°F)

Storage Temperature

-40°C to 85°C (-40°F to 185°F)

Packaging Information

Shipping (Package) Weight

6 oz [171 g]

What's in the Box

Included in Package

1 - PCI Express Serial Card


2 - Low Profile Brackets


1 - Driver CD


1 - Instruction Manual