Using an adapter, isolator, or hub: try to use a direct connection or a different adapter, isolator, or hub.If you are using an Instrument driver, check the How to Use an Instrument Driver in LabVIEW Tutorial.If you are directly using the NI-VISA API, check the Serial Instrument Control Tutorial.Failure to follow these steps can result in this error and cause various other problems in communicating with your instruments. In LabVIEW, you will generally need to open an NI-VISA session before communicating with an instrument and close the session once the communication is complete.Verify that you are properly opening and closing driver sessions.The resource name can change and it is recommended to test both NI-MAX and VISA resource names in the application if the error shows up. Note: This is a common cause after moving an application that is working on a PC to another PC with a different operating system. If you are deploying your application, programmatically retrieve VISA resource name.For example: using the Resource Name, ASR元::INSTR, instead of the Alias, 'COM3'.If you are currently using VISA Alias, try using the VISA Resource Name.Mac/Linux: NI-VISA Configuration utility.Windows: NI MAX on the main configuration page (Settings) of your VISA resource.Verify that you are addressing your instrument correctly.To know what Real-Time Operating System is used on your RT Target refer to Real-Time Controllers and Real-Time Operating System Compatibility. Note: NI-Serial RT is required in VxWorks and Phar Lap ETS based RT Targets.If it is not installed on the device, install them on your target . Real-Time Deployment: Verify that that the driver(s) you need are under Remote System > > Software.Otherwise, download and install the correct driver(s) for your hardware (found under Supported Devices under the driver version readme).Development: Verify that the driver(s) you need are installed and appears under My Systems > Software in NI MAX.Ensure you have NI-VISA and NI-Serial Driver installed in Your System:.Follow these recommended steps to troubleshoot this error: SolutionThis error has a few different possible causes.

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