Verify Installation and Troubleshoot NI-Serial Problems.Measurement & Automation Explorer (MAX).If any of your serial ports are still not visible, disconnect and reconnect the USB serial hardware to a different USB port and return to step 2.Windows should automatically detect your hardware.Click the Scan for Hardware Changes icon at the top of the Device Manager window.If any USB Composite Device has an exclamation mark, right-click the port and select Uninstall. Verify that no USB Composite Devices have exclamation marks (!). Double-click the Universal Serial Bus Controllers icon.If any USB serial port has an exclamation mark, right-click the port and select Uninstall. Verify that all USB serial communication ports are displayed without exclamation marks (!). Double-click the Ports (COM & LPT) icon.The Device Manager window should appear as shown below. Select the Hardware tab and click the Device Manager button.Select Start✼ontrol Panel and double-click the System icon.To solve this problem, complete the following steps: If your USB hardware does not show up in the device manager, Windows did not detect your hardware.
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