Error -1073807343 When Reading/Writing VISA to Serial Port in LabVIEW or LabWindows™/CVI

Issue Details

Solution

• Ensure you have NI-VISA and NI-Serial Driver installed in your system: 
  • Development: Verify that the driver(s) you need are installed and appears under My Systems >> Software in NI MAX
    • Otherwise, download and install the correct driver(s) for your hardware (found under Supported Devices under the driver version readme)
  • Real-Time Deployment: Verify that the driver(s) you need are under Remote System >> [Your Target] >> Software. If it is not installed on the device, install them on your target.
    • Note: NI-Serial RT is required in VxWorks and Phar Lap ETS based RT Targets. To know what Real-Time Operating System is used on your RT Target refer to Real-Time Controllers and Real-Time Operating System Compatibility
• Verify that you are addressing your instrument correctly.
  • Check that you are using the correct port number.
  • Check the resource in: 
    • Windows: NI MAX on the main configuration page (Settings) of your VISA resource.
    • Mac/Linux: NI-VISA Configuration utility.
  • If you are currently using a VISA Alias, try using the VISA Resource Name
    • For example: using the Resource Name, ​ASRL3::INSTR, instead of the Alias, "COM3"
  • If you are deploying your application, programmatically retrieve VISA resource name.

• Verify that you are properly opening and closing driver sessions.
  • 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. Failure to follow these steps can result in this error and cause various other problems in communicating with your instruments. See more below:
    • If you are directly using the NI-VISA API, check the Serial Instrument Control Tutorial
    • If you are using an Instrument driver, check the How to Use an Instrument Driver in LabVIEW Tutorial
• Using an adapter, isolator, or hub: Try to use a direct connection or a different adapter, isolator, or hub.
• cRIO in Hybrid Mode using the NI 987x: If you are planning to load and run the FPGA VI programmatically from the Real-Time VI using the Open FPGA VI Reference or Run Method, make sure that a considerable delay (at least 2 seconds) is left between the moment when the FPGA VI starts running and when the serial communication is opened with the NI-VISA VIs. This will ensure that the needed intermediate layers are already up and running before trying to establish communication.
• If the issue occurs only when running LabVIEW as Administrator or vice versa: The VI is most likely corrupted. Check How Can I Fix my Corrupted VI in my LabVIEW Project?
• Using multiple VISA resources on a Real-Time startup application: Try to add a delay at the start of the code before calling any of the VISA resources to be sure the system recognizes all of them.