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PyVisa shows multiple devices when only one device is connected

AdeelHAL123

Hi, 

I am trying to use Pyvisa to automate testing. Issue I am having is that pyvisa.ResourceManager() is displaying multiple devices when infact there is only one device.

Here are the screen shots of my code and ouput: 

image

Output: 

image

Parents
  • 0

    This is normal and it is because your VISA Layer itself has either autodetected or has been manually configured to represent serial ports (ASRL) and GPIB addresses 7 and 9 on one controller and 9 on a second as having devices available.

    Depending on your VISA Layer, you may be able to configure this behaviour, using whatever "device explorer" or configuration tools it comes with (e.g. NI MAX).

    This can also occur where a test device is connected to multiple interfaces at once.

    This is, in itself, not a problem as you should only be opening connections to specific devices of interest. It is very common to see all your serial ports listed as some older instruments had serial ports as the only alternative to GPIB and even some new instruments can be configured for USB-CDC as an alternative to USB-TMC

    - Gough

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  • 0

    This is normal and it is because your VISA Layer itself has either autodetected or has been manually configured to represent serial ports (ASRL) and GPIB addresses 7 and 9 on one controller and 9 on a second as having devices available.

    Depending on your VISA Layer, you may be able to configure this behaviour, using whatever "device explorer" or configuration tools it comes with (e.g. NI MAX).

    This can also occur where a test device is connected to multiple interfaces at once.

    This is, in itself, not a problem as you should only be opening connections to specific devices of interest. It is very common to see all your serial ports listed as some older instruments had serial ports as the only alternative to GPIB and even some new instruments can be configured for USB-CDC as an alternative to USB-TMC

    - Gough

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