8756A locks up after read

[yasmain62]

I've been working with the HP 8756A and have been having problems with it locking up after performing a read function.

After entering command 'OD' and reading all 401 points, "Data Dump" appears on the screen.From this point on I can not send any command or retrieve any data.

When I use “OI” command for identification, HP 8756A locked up again!!!

I have attached the program to call for and retrieve the data in case it is in my programming.

Thanks for any help

[nyc_(is_out_of_here)]

Are these driver VIs or did you write them yourself?

What does the programming manual say are command syntax?

[yasmain62]

NI doesn’t have any driver for it and I couldn’t find a driver that is compatible with 8756A Network analyzer. So I writed my VISA driver. I attached the operation manual of 8756A Network analyzer; there is the programming manual at 57 page of it

[nyc_(is_out_of_here)]

Are you able to use VISA Interactive to communicate with the instrument?

This removes the unknown of your LabVIEW VIs.

This is a very old instrument, you might also want to look into NI-488 instead of VISA.

[yasmain62]

I don’t know that this instrument supports VISA or not. But I did configuration setting on this instrument by “VISA write” and also I could do to force instrument to Reset.

I used “VISA open” to set VISA resource name to “GPIB1::19::INSTR”. Only, I have been having problems with it locking up after performing a read function.

So this instrument supports VISA, Is it true?

[JÞB]

VISA will not be a problem.  but with old old old HP-IB you need to tweak some VISA session properties (untalk and unlisten for starters)

[yasmain62]

I can not find terminal port on your image. I put “property node” on VI and added 6 properties, but I could not find the port which connected to “TermChar property”.

Please guide me to find it on function palette.

I attached the new Initialize.vi.

Thank you.

[crossrulz]

That is the Type Cast function.  The point of it is to change the string character into a U8.  It can be found in the Numeric->Data Manipulation palette.

[JÞB]

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@yasmain62 wrote:

I can not find terminal port on your image. I put “property node” on VI and added 6 properties, but I could not find the port which connected to “TermChar property”.

Please guide me to find it on function palette.

I attached the new Initialize.vi.

Thank you.

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That is a Snippet not an image.  you can drop it on a blank block diagram and RUN it with LabVIEW 2012

[Shawn_S.]

Hello Jeff,

Would you mind posting the snippet in an older version of LabVIEW (possibly 2009) for the benefit of others who will read this discussion forum?