Quatech USB-to-Serial Driver Set for Windows readme file
(Please refer to the HISTORY.TXT file for change history.)
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Readme Contents
Section 1: Driver Overview
Section 2: Devices Supported by Driver Set
Section 3: New Hardware Installation
Section 4: Updating drivers on Windows 2000/XP for an Existing Hardware Installation
Section 5: Updating drivers on Windows 98/Me for an Existing Hardware Installation
Section 6: Files Includes with this Driver Set
Section 7: Release Notes
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[SECTION 1: Driver Overview]
This readme file contains information for the Quatech USB-to-Serial Driver Set.
For full information on using a Quatech USB-to-Serial product, please see
the User's Manual included with the product or download the PDF version of
the manual from our website:
http://www.quatech.com/
Note that Windows 98/ME support has been frozen and will not be available
for the newer USB 2.0 compatible products.
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[SECTION 2: Devices Supported]
USB 2.0 compatible devices:
(Supported on Windows 2000/XP)
Model Supported revisions Description
----- ------------------- -----------
SSU2-100 all Single-channel USB to RS-232
DSU2-100 all Two-channel USB to RS-232
DSU2-400 all Two-channel USB to RS-232/422/485
QSU2-100 all Four-channel USB to RS-232
QSU2-400 all Four-channel USB to RS-232/422/485
ESU2-100 all Eight-channel USB to RS-232
ESU2-400 all Eight-channel USB to RS-232/422/485
USB 1.1 compatible devices manufactured since March 2003:
(Supported on Windows 98/Me/NT4/2000/XP)
Model Supported revisions Description
----- ------------------- -----------
SSU-100 C3 and later Single-channel USB to RS-232
DSU-100 F3 and later Two-channel USB to RS-232
DSU-200/300 F3 and later Two-channel USB to RS-422/485
QSU-100 F3 and later Four-channel USB to RS-232
QSU-200/300 F3 and later Four-channel USB to RS-422/485
ESU-100 E2 and later Eight-channel USB to RS-232
ESU-200/300 E2 and later Eight-channel USB to RS-422/485
HSU-100 E2 and later Sixteen-channel USB to RS-232
HSU-200/300 E2 and later Sixteen-channel USB to RS-422/485
Older 1.1-compatible units are supported by a different driver set.
Please visit www.quatech.com and download the correct driver set.
Contact our technical support department if you have any questions.
All USB-to-Serial products have a sticker listing manufacturing data. This
sticker is on the bottom of the case, except for the SSU devices, which
have the sticker on the side of the case.
Find the sticker on your USB-to-Serial product. Locate the assembly revision
level. The assembly revision level is made up of a letter designating a
major level and an optional digit designating a minor level. Major revisions
increase in alphabetical order. Minor revisions increase in numerical order.
Example: F3 is higher than F2.
F2 is higher than F.
F is higher than E4.
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[SECTION 3: New Hardware Installation]
If you are attempting to install your product for the first time, please read
the PDF file User’s Manual on the CD which came with your hardware. That
document will contain detailed instructions with screen shots from the
different versions of Windows to guide you through the installation process.
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[SECTION 4: Updating drivers on Windows 2000/XP
for an Existing Hardware Installation]
The "Update Drivers" button in Device Manager does not work reliably and cannot
be used to update USB-to-Serial device drivers. It is necessary to uninstall
the USB-to-Serial device, remove the files that Windows uses to choose the proper
drivers, and then reinstall the USB-to-Serial device using the new drivers.
Follow the detailed steps below. Contact Quatech technical support for
assistance if you have any questions or difficulties with these steps.
Uninstalling the old drivers
----------------------------
(These steps are for Windows XP. Windows 2000 is very similar.)
1. Ensure that a USB cable is connected between the USB-to-Serial device and
your computer.
2. Open Device Manager by clicking the "Start" button, then selecting
"Settings->Control Panel." Double-click the "System" icon. Click on
the "Hardware" tab, then the "Device Manager" button.
3. Double-click on "Multi-port serial adapters." You should see your
USB-to-Serial device listed under "Multi-port serial adapters."
4. Click on the entry for the USB-to-Serial, then from the menu bar, select
"Action/Uninstall."
5. Unplug the USB-to-Serial device's USB cable.
6. Click the "Start" button, then "Search."
7. Click on "All Files and Folders" if you see it in the left-hand pane.
8. In the "All or part of the file name" box, type "OEM*.INF".
9. In the "A Word or phrase in the file" box, type "QTUSB".
10. In the "Look in" box, select "Local Hard Drives".
11. Under "Advanced Options," make sure the following checkboxes are checked:
"Search system folders"
"Search hidden files and folders"
"Search subfolders"
11. Click the "Search" button. Wait for the search to complete.
Results will appear in the right-hand pane.
12. Note any matching files that reside in the \WINDOWS\INF folder.
Select one of them and click it with the right mouse button.
Choose "Open Containing Folder." This should open the \WINDOWS\INF folder
with the file highlighted.
13. Select all of the files that matched the search results. (The search
results window should still be open if you need to refer back to it.)
Also select the files with the same name but a file extension of .PNF.
For instance, if the search found OEM7.INF, select OEM7.INF and OEM7.PNF.
14. Drag the files to the Recycle Bin.
15. Close all windows.
16. Shutdown the computer and reboot.
Installing the new drivers
--------------------------
1. Plug the USB cable into the USB-to-Serial device.
2. Windows should detect the USB-to-Serial device as new hardware.
3. Follow the wizard prompts to install the new drivers.
Be sure to point to the new drivers as you step through the wizard.
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[SECTION 5: Updating drivers on Windows 98/Me
for an Existing Hardware Installation]
The "Update Driver" button in Device Manager does not work reliably and cannot
be used to update USB-to-Serial device drivers. It is necessary to uninstall
the USB-to-Serial device, remove the files that Windows uses to choose the proper
drivers, and then reinstall the USB-to-Serial device using the new drivers.
Follow the detailed steps below. Contact Quatech technical support for
assistance if you have any questions or difficulties with these steps.
Uninstalling the old drivers
----------------------------
(These steps are for Windows Me. Windows 98 is very similar.)
1. Ensure that a USB cable is connected between the USB-to-Serial device and
your computer.
2. Open Device Manager by clicking the "Start" button, then selecting
"Settings->Control Panel." Double-click the "System" icon. Click on
the "Device Manager" tab.
3. Double-click on "Multi-port serial devices." You should see your
USB-to-Serial device listed under "Multi-port serial devices."
4. Click on the entry for the USB-to-Serial, then click the "Remove" button.
5. Unplug the USB-to-Serial device's USB cable.
6. Click the "Start" button, then "Search->For Files or Folders."
7. In the "Search for files" box, type "*.INF".
8. In the "Containing text" box, type "QTUSB".
9. In the "Look in" box, select "Local Hard Drives".
10. Click "Search Now." Wait for the search to complete. Results will
appear in the right-hand pane.
11. Find any matching files that reside in the \WINDOWS\INF or
\WINDOWS\INF\OTHER directories. Highlight them and drag
them to the Recycle Bin.
12. Close all windows.
13. Shutdown the computer and reboot.
Installing the new drivers
--------------------------
1. Plug the USB cable into the USB-to-Serial device.
2. Windows should detect the USB-to-Serial device as new hardware.
3. Follow the wizard prompts to install the new drivers.
Be sure to point to the new drivers as you step through the wizard.
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[SECTION 6: Files Includes with this Driver Set]
The set consists of all driver files required for both Windows 98/ME and Windows 2000/XP. Following is
a list of the files required for each OS and their destination directories, where d: is the drive on
which Windows is installed.
Windows 98/ME
Destination directory d:\windows\inf\other\
qtusbbx2.inf
qtusbpt2.inf
Destination directory d:\windows\system\
qtusbcom.dll
qtusbcom.sys
serqtusb.vxd
Windows 2000
Destination directory d:\winnt\inf\
qtusbbx2.inf
qtusbpt2.inf
Destination directory d:\winnt\system32\
qtucomco.dll
qtucompp.dll
Destination directory d:\winnt\system32\drivers\
qtucombx.sys
qtucompt.sys
qtwdmlib.sys
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[SECTION 7: Release Notes]
Please refer to the HISTORY.TXT file for change history.
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.