Site map           © Soft Byte Ltd 2012, 2024            Photos & screen shots are for illustrative purposes and may differ slightly from actual product.

Home Solutions Products Orders Tutorials Downloads Gallery Training Support Contact



This is for USB cable links, and for serial cable links that are being used with an old or new type of USB to serial converter. Make sure your USB cable or USB converter is attached. If your USB cable has a power supply unit make sure it is switched on.

 If you have a Mac computer that has an M1 or M2 ARM processor, you will need to download the ARM driver from here.

Open Device Manager as follows.

1. Under Windows 10 or 11, select Settings. In the main Settings window, there is a search box that says “Find a setting”. Type Device Manager into the search box and then select Device Manager from the list that appears. Under other versions of Windows, open a "Computer" window and select "Control Panel" (it may also be necessary to select "Performance and Maintenance" or “System and Security”) then “System”, “Hardware” and finally “Device Manager”.

2. Make sure View / Devices by type is selected.

3. In the list of devices, double click on "Ports (COM & LPT)".

4. This will produce additional lines in the list of devices, one for each port that the computer has. Each new line will be something like "Communications Port (COM1)”

5. If you are using a USB cable link, or a new type USB converter, look for a port called “USB serial port” or similar. If you are using an old type USB converter, look for a port called “Prolific USB serial port” or similar. If you are using a true serial port, look for one called "Communications Port (COM1)” or similar.

6. You can check whether the listed device refers to your cable link or USB converter by unplugging the link or converter. If the listed device disappears, this is a good indication that it did refer to the link or converter. Please reconnect it for the remaining points.

7. If there is a yellow icon showing an exclamation mark next to the port, it means that there is a problem with the driver or the device.

8. If there is a category called Other Devices, open it up by double clicking on it. See whether it contains a device that is marked with a yellow exclamation icon.

9. If a yellow exclamation icon was found in either of the previous points, right click on the device and click Remove, Delete, or Uninstall (depending on your version of Windows). Disconnect your cable link or USB to serial converter from the computer and restart Windows (after printing out this page so that you can continue to follow these instructions).

10. After restarting Windows, install the driver again. To do this, see our Downloads page and go to the section on Cable Links or USB converter as appropriate. Select the link for downloading a driver installer.

11. After installing the driver, open Device Manager again. If the yellow exclamation icon has reappeared, it could mean that the cable or USB to serial converter is faulty: please contact your technical support. See DesignaKnit 8’s Help / Technical support window for details.

If this did not correct the problem, please try changing the Windows port number.  

If you have a USB to serial converter, you might need a newer model of converter: click here.

Checking for driver installation problems indicated by yellow icon

To return to Cable Links Troubleshooting, click here.

Back to top