If you are unable to connect to a VISA device using the
interface, follow these troubleshooting steps.
Make sure your device is powered on and all cables are properly connected.
Make sure that you have the correct instrument driver installed for your device. Refer to your device documentation and the vendor website.
If you are connecting to a GPIB device using an NI GPIB adaptor, you must download the NI-488.2 driver compatible with your VISA driver version from the NI website. The NI-488.2 driver is not available as an Instrument Control Toolbox™ support package.
Make sure that Instrument Control Toolbox recognizes your device, by using the
resourceList = visadevlist
resourceList = 6×6 table ResourceName Alias Vendor Model SerialNumber Type __________________________________________ _________________ ______________________ ___________ ____________ ______ 1 "USB0::0x0699::0x036A::CU010105::0::INSTR" "NI_SCOPE_4CH" "TEKTRONIX" "TDS 2024B" "CU010105" usb 2 "TCPIP0::169.254.2.20::inst0::INSTR" "Keysight_33210A" "Agilent Technologies" "33210A" "MY57003523" tcpip 3 "ASRL1::INSTR" "COM1" "" "" "" serial 4 "ASRL3::INSTR" "COM3" "" "" "" serial 5 "GPIB0::5::INSTR" "FGEN_2CH" "Agilent Technologies" "33522B" "MY52800145" gpib 6 "GPIB0::11::INSTR" "OSCOPE_2CH" "TEKTRONIX" "TDS 1002" "0" gpib
visadev object using one of the
resource names listed. If your instrument is not listed, it might
not be configured properly in your VISA vendor’s configuration
VISA-TCP/IP, VISA-Socket, and VISA-Serial instruments and
devices might need to be added manually in the VISA vendor's
configuration utility to appear in the
If you are still having connection or communication issues with your instrument using VISA, you can troubleshoot using your VISA vendor's software and utilities, as described in the following table.
|VISA Vendor||Configuration Utility||Testing Connection||Debug Utility|
|Keysight™ VISA||Keysight Connection Expert (KCE)||Interactive IO button on KCE||IO Monitor button on KCE|
|NI-VISA||NI Measurement and Automation Explorer (NI MAX)||Tools > NI VISA > VISA Interactive Control||Tools > NI I/O Trace|
|Rohde & Schwarz R&S VISA||RsVisaConfigure, launched from RsVisa Config tab on RsVisaTester||RsVisaTester||RsVisaTraceTool, launched from RsVisa TraceTool tab on RsVisaTester|
Use the VISA Conflict Manager settings from your VISA vendor's configuration utility to make sure that you have a preferred VISA set and that it is enabled. Check if all the VISA interfaces are using the expected VISA. For R&S VISA, make sure it is set to "Preferred". For example, for the Keysight Connection Expert, do the following.
Open the settings menu and select Tools > VISA Conflict Manager.
Under Enabled Implementations, make sure that your VISA vendor is selected.
Under Preferred Implementation, make sure that your VISA vendor is selected.
If you are using SCPI commands, check if your device responds to them as expected when they are issued from the configuration utility.
Use your VISA vendor's configuration utility to make sure that your
device hardware is being detected. You can also check that your device
responds to a
Use your VISA vendor's debug utility to check the Instrument I/O traffic for errors other than timeout errors.
Try installing a different supported VISA vendor's driver.
You can use other Instrument Control Toolbox interfaces to troubleshoot VISA. Try connecting to your devices using these interfaces.