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 "usb716.zip" is rated (5 out of 5 stars) based on 285 downloads and 10 reviews. Compatibility for this driver update includes PCs running Windows operating systems such as Windows Vista and Windows XP. The total disk space used for this update is 172.9 KB.

10 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


7.167.16 (2007-02-09) via .inf

Additional Notes


USB Serial Adapter Driver File

Uploaded By

Malathy (DG Staff Member) on 5-Mar-2007

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
QTUSBBX2.INF 9.4 KB 9 Feb 2007
QTUSBCOM.DLL 19.8 KB 12 Aug 2004
QTUSBCOM.SYS 63.6 KB 2 Dec 2005
QTUSBPT2.INF 4.4 KB 9 Feb 2007
SERQTUSB.VXD 7.8 KB 26 Oct 2001
cocpyinf.dll 22.0 KB 16 Apr 2003
history.txt 19.2 KB 9 Feb 2007
qtucombx.sys 103.3 KB 9 Feb 2007
qtucomco.dll 15.4 KB 22 Feb 2006
qtucompp.dll 43.5 KB 25 Jan 2007
qtucompt.sys 57.9 KB 25 Jan 2007
qtusbbx2.cat 12.4 KB 28 Aug 2006
qtusbpt2.cat 9.8 KB 28 Aug 2006
qtwdmlib.sys 17.9 KB 23 May 2005
readme.txt 10.4 KB 24 Aug 2006

How to Update QSU2-400-EMB Device Drivers Quickly & Easily

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

Once you have downloaded your new driver, you'll need to install it. In Windows, use a built-in utility called Device Manager, which allows you to see all of the devices recognized by your system, and the drivers associated with them.

How to Open Device Manager

  • In Windows 11, Windows 10 & Windows 8.1, right-click the Start menu and select Device Manager

  • In Windows 8, swipe up from the bottom, or right-click anywhere on the desktop and choose "All Apps" -> swipe or scroll right and choose "Control Panel" (under Windows System section) -> Hardware and Sound -> Device Manager

  • In Windows 7, click Start -> Control Panel -> Hardware and Sound -> Device Manager

  • In Windows Vista, click Start -> Control Panel -> System and Maintenance -> Device Manager

  • In Windows XP, click Start -> Control Panel -> Performance and Maintenance -> System -> Hardware tab -> Device Manager button

How to Install a driver from Device Manager

  1. Locate the device and model that is having the issue and double-click on it to open the Properties dialog box.

  2. Select the Driver tab.

  3. Click the Update Driver button and follow the instructions.

In most cases, you will need to reboot your computer in order for the driver update to take effect.

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.

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