Quatech QSU2-400-EMB Driver Download (Official)

Download the latest version of the QSU2-400-EMB driver for your computer's operating system. This version of "usb720.zip" has been downloaded 20 times with a user rating of 1 out of 5 stars, based on 6 reviews. It is compatible with PCs running Windows Vista and Windows XP, among other operating systems. The total disk space used for this update is 134.7 KB.

6 Ratings

Supported Models


DSU-100 Dual RS-232 Serial Ports

DSU-200/300 Dual RS-422/485 Serial Ports

DSU2-100 Dual RS-232 Serial Ports

DSU2-400 Dual RS-232/422/485 Serial Ports

ESU-100 Eight RS-232 Serial Ports 1-4

ESU-100 Eight RS-232 Serial Ports 5-8

ESU-200/300 Eight RS-422/485 Serial Ports 1-4



Supported Operating Systems

Windows Vista, Windows XP, Windows 2000

File Name


7.207.20 (2007-03-05) via .inf

Additional Notes


USB Serial Adapters

Driver File

Uploaded By

Karthikkumar (DG Staff Member) on 11-Dec-2008

How to Update QSU2-400-EMB Device Drivers

Step 1 - Download Your Driver

To get the QSU2-400-EMB driver, click the green download button above. After you complete your download, move on to Step 2.

If the driver listed is not the right version or operating system, search our driver archive for the correct version. Enter Quatech QSU2-400-EMB into the search box above and then submit. In the results, choose the best match for your PC and operating system.

Tech Tip: If you are having trouble deciding which is the right driver, try the Driver Update Utility for Quatech QSU2-400-EMB. It is a software utility which automatically finds and downloads the right driver.

Step 2 - Install Your Driver

Installing your newly downloaded driver is a straightforward process. Windows provides a dedicated tool called Device Manager for this purpose. Follow these steps to update your driver:

  1. Access the Quick Access menu by right-clicking the Start button.

  2. From the menu options, choose "Device Manager".

  3. Within Device Manager, identify the device requiring the driver update.

  4. Open the context menu for the device by right-clicking its name.

  5. Select "Update driver" and proceed through the guided installation.

To complete the process, reboot your computer. This ensures the new driver is fully integrated into your system.

Regular driver updates contribute to optimal system performance and hardware compatibility.

Tech Tip: Driver downloads and updates come in a variety of file formats with different file extensions. For example, you may have downloaded an EXE, INF, ZIP, or SYS file. Each file type has a slighty different installation procedure to follow.

For more help, visit our Driver Support Page for step-by-step videos on how to install drivers for every file type.

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
QTUSBBX2.INF 9.4 KB 5 Mar 2007
QTUSBPT2.INF 4.4 KB 5 Mar 2007
cocpyinf.dll 22.0 KB 16 Apr 2003
history.txt 19.3 KB 5 Mar 2007
qtucombx.sys 103.3 KB 5 Mar 2007
qtucomco.dll 15.4 KB 5 Mar 2007
qtucompp.dll 43.5 KB 25 Jan 2007
qtucompt.sys 57.9 KB 5 Mar 2007
qtusbbx2.cat 15.0 KB 12 Mar 2007
qtusbpt2.cat 12.4 KB 12 Mar 2007
qtwdmlib.sys 17.9 KB 23 May 2005
readme.txt 10.4 KB 24 Aug 2006
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