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Quick-Start Guide

To view manuals, FAQs, videos, drivers, downloads, technical drawings, and more, visit www.startech.com/support.

Manual Revision: August 27, 2020

Product Diagram (PEXUSB321C)

Front Angle View

Port

Function 

1

USB-C Port 

•  Connect a 

USB Peripheral Device

•  SuperSpeed USB 20Gbps

2

Bracket

•  Configurable for 

Full Profile 

and 

Low Height 

installations

3

PCIe x4 Connector

•  Connect the 

USB Card

 to the 

PCI Express

®

 Slot

 in 

the 

Computer

Requirements

For the latest requirements, please visit:  

www.startech.com/PEXUSB321C

.

• Computer with an available PCI Express slot (x4, x8, or x16)

Tools

• Small Phillips Head Screwdriver

Hardware Installation

Warning: USB Cards

 can be damaged by static electricity. Make sure that the 

Installer

 is properly grounded before they open the 

Computer Case

 or touch the 

USB 

Card

. The

 Installer

 should wear an 

Anti-Static Strap 

when installing any computer 

component. If an 

Anti-Static Strap

 is not available, discharge any built-up static 

electricity by touching a large 

Grounded Metal Surface

 for several seconds. Only 

handle the 

USB Card

 by its edges and do not touch the gold connectors.

1-Port USB Card - SuperSpeed USB 20Gbps - 1x USB-C® - PCIe

Installing the Low Profile Bracket

By default the 

Full Profile Bracket

 is attached to the 

USB Card

. Depending on the 

system configuration it may be necessary to remove the 

Full Profile Bracket

 and 

replace it with the 

Low Profile Bracket

 (included).

1.  Using a 

Small Phillips Head Screwdriver

, remove the two 

Bracket Screws

 securing 

the 

Full Profile Bracket

 to the 

USB Card

.

2.  Align the 

Screw Holes

 on the 

USB Card

 with the 

Screw Holes

 on the 

Low Profile 

Bracket

. Making sure the 

USB Card

 is sitting on-top of the 

Screw Holes

 on the 

Low 

Profile Bracket

.

3.  Insert the 

Bracket Screws

 through the 

USB Card

 and into the 

Screw Holes

 on the 

Low Profile Bracket

.

4.  Using the 

Small Phillips Head Screwdriver

, tighten the 

Bracket Screws,

 being 

careful not to over-tighten.

Installing the USB Card

1.  Turn off the 

Computer

 and any 

Peripheral Devices

 that are connected  

(e.g. printers, external hard drives, etc.).

2.  Unplug the 

Power Cable

 from the rear of the 

Computer

 and disconnect any 

Peripheral Devices

 that are connected.

3.  Remove the 

Cover

 from the 

Computer Case

Note: 

Consult the documentation that came with the 

Computer

 for details about 

how to do this safely. 

4.  Locate an open

 PCI Express Slot

 (x4, x8, or x16) and remove the corresponding 

Metal Cover Plate

 from the rear of the 

Computer Case

. In most instances, the 

Metal Cover Plate

 is attached to the rear of the

 Computer Case

 with a single 

Screw

. Save this 

Screw

 for the next step. 

5.  Gently insert the 

USB Card

 into the open 

PCI Express Slot

 and fasten the 

Bracket

 

to the rear of the 

Computer Case

 using the 

Screw

 from step 4. 

6.  Place the 

Cover

 rear onto the 

Computer Case

7.  Reconnect the 

Power Cable

 to the rear of the 

Computer

.

8.  Reconnect all of the 

Peripheral Devices

 that were disconnected in step 2.

9.  Connect a 

USB Peripheral Device

 to the 

USB-C Port

 on the

 USB Card

.

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