Any of the following may be a cause.

• This occurs when the computer does not recognize the GP-IB interface. Check that the GP-IB interface is correctly recognized by the device manager. If not, check that the GP-IB board is connected correctly or that the GP-IB driver is installed correctly.
• This occurs when the GP-IB settings (addresses and delimiters) are different between the software and the instrument. Check the setting.
• The installed version of the GP-IB driver may not be compatible with the OS.
• GP-IBThe GP-IB interface may be damaged. Check and replace the GP-IB interface.
• The GP-IB cable may be broken. Check and replace the GP-IB cable.

How to check the connection
Start Measurement & Automation, and initiate an instrument scan. Check that the connected measuring instrument is recognized.