When you troubleshoot issues with a serial or parallel hybrid device, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:
Serial or parallel cables
Serial or parallel ports
Serial or parallel devices
Nov 13, 2016 Installing COM or LPT ports on a USB port with an external adapter on Windows 7 or Windows 10. USB to Serial or Parallel Adapter Installation Windows 7 & Windows 10 Engrossed Entertainment.
To test your setup components, try the following:
Use the serial or parallel cable, serial or parallel port, and serial or parallel device in another setup to see if the problem is with the components or the setup.
Use a different serial or parallel cable, serial or parallel port, and serial or parallel device in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.
When you test your cables, it is recommended that you do the following:
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Test each cable individually.
Use short cables when you are testing.
When you test the serial or parallel ports and serial or parallel device, it is recommended that you do the following:
Press the Windows key + R, type devmgmt.msc, and press Enter to open Device Manager. Check to see if your device is listed under Ports (COM & LPT).
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Make sure that the COM or LPT port number is the correct number for the serial or parallel device and that the software being used to connect the computer to the serial or parallel device uses the correct COM or LPT port number.
If you do not see the COM or LPT port number in Device Manager see this FAQ for PCI/PCIe expansion cards: https://www.startech.com/support/faqs/technical-support?topic=expansion-cards#pci-pcie-cannot-boot-os-or-detect-windows or this FAQ for USB devices: https://www.startech.com/support/faqs/technical-support?topic=expansion-cards#usb-cannot-detect-windows
If the device is listed with an error, follow the instructions on the website to reinstall the drivers.
Note: Some serial devices work only if the COM or LPT port number is between a certain range. For example, COM1 to COM4 for serial and LPT1 and LPT2 for parallel.
Perform a serial loopback test. See this FAQ on how to perform a RS-232 serial loopback test: http://www.startech.com/faq/serial_loopback_test_rs232_windows
Note: There is not an equivalent loopback test that can be performed for parallel devices.
If the USB device does not work after your computer has been in extended hibernation, it is likely that Windows has automatically turned off the USB Root hub to save power. The steps below outline how to configure the USB root hub to stay on during hibernation, to prevent this from happening.
Windows 10 / 8
On your keyboard, press the Windows key + X and select Control Panel.
Click Hardware and Sound, then click Power Options.
Click Change plan settings for the plan you want to change.
Click Change advanced power settings.
Click the plus sign (+) next to “USB settings” and “USB selective suspend setting” to expand the options and change the setting to Disabled.
Click OK to apply the setting.
Note: You may need to disconnect and re-connect your USB device after applying these settings to re-establish the connection.
Windows 7 / Vista
Click the Start button and select Control Panel.
Click Hardware and Sound, then click Power Options.
Click Change plan settings for the plan you want to change.
Click Change advanced power settings.
Click the plus sign (+) next to “USB settings” and “USB selective suspend setting” to expand the options and change the setting to Disabled.
Click OK to apply the setting.
Note: You may need to disconnect and re-connect your USB device after applying these settings to re-establish the connection.
Windows XP
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On your desktop, right-click the My Computer icon and select Properties.
Click the Device Manager tab.
Expand Universal Serial Bus controllers by clicking the arrow to the left of it.
Right-click the first USB Root Hub device and select Properties.
Click the Power Management tab.
Clear the box next to Allow the computer to turn off this device to save power.
Click OK to apply the setting.
Repeat steps 4-7 for any remaining devices in the Universal Serial Bus Controllers section with “Root Hub” in the name.
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Note: You may need to disconnect and re-connect your USB device after applying these settings to re-establish the connection.