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Quick-Start Guide

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Manual Revision: November 27, 2019 1:15 PM

Product Diagram (PEX2S953)

Port

Function 

1

Serial Ports

•  Connect up to two 

Serial Devices

2

Stand-offs

•  Attach the 

Bracket 

to the 

PCI Express Serial Card

•  Secure the 

Serial Cables

 to the 

Serial Ports

3

Bracket

•  Attach the 

PCI Express Serial

 

Card

 to the 

Computer

4

PCI Express Bus 

Connector

•  Connect the 

PCI Express Serial Card

 to the 

Computer Motherboard

5

Jumper

•  Configure the individual 

Serial Connector 

power 

settings

6

LP4 Power Connector

•  Used to connect an 

LP4 Power Source

2-Port PCI Express Serial Card with 16950 UART

Requirements

For the latest requirements please visit  

www.startech.com/PEX2S953

• PCIe Slot
• Needle-Nose Pliers
• (Optional) LP4 Power Source

Installation

WARNING! 

PCI Express Serial Cards

 can be severely damaged by static 

electricity. Make sure that you are properly grounded before you open the 

Computer Case

 or touch the 

PCI Express Serial Card

. You should wear an 

Anti-Static Strap 

when you install any computer component. If an 

Anti-Static 

Strap

 isn’t available, discharge any built-up static electricity by touching a large 

Grounded Metal Surface

 for several seconds. Only handle the 

PCI Express Serial 

Card

 by its edges and don’t touch the gold connectors.

Jumper Configuration

Note: 

This 

PCI Express Serial Card

 is specially designed to allow for power output 

from the ninth pin of the 

Serial Connector(s)

 for 

Serial Devices

 that support power 

over serial. 

Jumper 

configuration is a requirement when connecting 

Serial Devices 

that require power through a 

Serial Connector

.

The 

Jumper 

can be moved into one of three different positions in order to set the 

power output voltage for the 

Serial Connector

. The default setting for the 

Jumpers

 

is 

RI

, no power. The 

LP4 Power Connector 

must be connected after configuring the

 

Jumper

 to 

5V

 or 

12V 

of power. To configure the 

Jumper

, complete the following:

1.  Ensure the 

Computer’s

 

Power

 is

 Off.

2.  Determine the power setting that is required for 

Port One

.

3.  Locate the 

Jumper

 for 

Port One 

and

 

carefully lift the 

Jumper 

straight up and off of 

the 

PCI Express Serial Card

.

Notes: 

The Jumper for Port 1 is labeled as J1 on the Printed Circuit Board. 

           Always 

hold the Card by the edges.

4.  Position the 

Jumper

 over the set of 

Pins

 that correspond with the desired 

Serial 

Connector Power Setting

. See 

Figure 1

 to determine where the 

Jumper

 should be 

positioned.

5.  Push the 

Jumper

 straight down and into place.

Note: 

Push the

 Jumper 

all the way into position for proper contact.

1

4

6

1

5

2

2

3

5

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