Download the latest version of the QSU-300 driver for your computer's operating system. This version of "usb580.exe" has been downloaded 27 times with a user rating of 5 out of 5 stars, based on 5 reviews. It is compatible with PCs running Windows XP, among other operating systems. The total disk space used for this update is 187.4 KB.
QSU-300
DSU-100 Dual RS-232 Serial Ports
DSU-200/300 Dual RS-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
ESU-200/300 Eight RS-422/485 Serial Ports 5-8
HSU-100 Sixteen RS-232 Serial Ports 01-04
Windows XP, Windows 2000
usb580.exe (187.4 KB)
5.805.80 (2005-01-10) via .inf
5.80 (2005-01-11) via .inf
QSU-300
Driver Version 5.80--WHQL signed
Nagarajah (DG Staff Member) on 21-Feb-2006
To get the QSU-300 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 QSU-300 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 QSU-300. It is a software utility which automatically finds and downloads the right driver.
After downloading your new driver, installation is the next step. On Windows, utilize the built-in Device Manager utility to manage this process. This tool provides a comprehensive view of all system-recognized devices and their associated drivers. To complete the installation, a system restart is typically required 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.
The following files are found inside the driver download file.
| Name | Size | Date |
|---|---|---|
| QTUSBBX2.INF | 7.4 KB | 11 Jan 2005 |
| QTUSBCOM.DLL | 19.8 KB | 12 Aug 2004 |
| QTUSBCOM.SYS | 63.3 KB | 11 Aug 2004 |
| QTUSBPT2.INF | 3.5 KB | 10 Jan 2005 |
| SERQTUSB.VXD | 7.8 KB | 26 Oct 2001 |
| cocpyinf.dll | 22.0 KB | 16 Apr 2003 |
| history.txt | 16.3 KB | 21 Jan 2005 |
| qtucombx.sys | 93.3 KB | 31 Jan 2005 |
| qtucomco.dll | 6.1 KB | 10 Jan 2005 |
| qtucompp.dll | 37.9 KB | 10 Jan 2005 |
| qtucompt.sys | 57.9 KB | 20 Jan 2005 |
| qtusbbx2.cat | 11.5 KB | 8 Feb 2005 |
| qtusbpt2.cat | 8.9 KB | 8 Feb 2005 |
| qtwdmlib.sys | 18.0 KB | 17 Jan 2005 |
| readme.txt | 9.8 KB | 14 Apr 2003 |