Checking for GPIB devices

[Kaspar]

Hello,

   I have some code that sends a "*IDN?" to GPIB addresses 1 thru 31, if I get a response to the query I assume that a GPIB device exists at the address. This approach gets all hosed up when I have a GPIB instrument that does does support/recognize the *IDN? query.   MAX however is able to recognize that a GPIB device does exist at the address of the instrument that I have. Any ideas of how to recognize/detect if a GPIB device exists if it does not respond to a *IDN?

Regards

Kaspar

[Dennis_Knutson]

I don't remember the exact sequence that is used in MAX. It uses low level GPIB functions. To get the sequence of function calls, turn on NI-Spy and do a Scan For Instruments.

[Kaspar]

Hello,

  I used NI-spy to see what Max does and looked at the low level calls. There is a function called FindLstn that finds all of the listening devices on the GPIB bus. So now I have to see if there is such a low level call in Labview. The saga continues...

Regards,

Kaspar

[smercurio_fc]

There is. FindLstn

[Dennis_Knutson · Accepted solution]

Use the function of the same name on the Instrument I/O>GPIB>488.2 palette.

[Kaspar]

Hello,

  I used the find listener function and it works just the way I want it to. Now I have a way to identify devices that do not respond to a *IDN? query.

Thanks again....

Regards,

Kaspar

[Mathan]

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Kaspar wrote:

it works just the way I want it to. Now I have a way

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Hai Kaspar,

Can you please post that code. This will help me now and will help others also in future.

Thanks,

Mathan

[parthabe]

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Kaspar wrote:

I used NI-spy to see what Max does

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When I press the Start button of NI Spy, nothing happens. It stays only blank.

Am I using it wrongly?

[Mathan]

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parthabe wrote:

When I press the Start button of NI Spy, nothing happens. It stays only blank.

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It stays blank initially. Once you start sending some commands, it will be captured. Launch NI Spy and use MAX - VISAIC (VISA Interactive Control) and do some change in attributes and see what's happening in Spy.

Mathan