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Difference programmatically between NI GPIB-PCI and NI GPIB-USB-HS?

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Hello all,

 

I am writing an application that accesses some GPIB equipment. On my development machine I have an NI GPIB-USB-HS connection and that is working just fine. On my first test machine I have a NI GPIB-PCI connection. The app seems to have a problem when sending commands to the GPIB over the PCI connection.

 

Using MAX on the test machine I can connect to the equipment and send commands over the PCI connection with no issues. Both the USB connection on my development machine and the PCI connection on the test machine are address 0.  The addresses of the GPIB equipment in both scenarios are the same, 4 and 12.

 

Because I am able to send commands through MAX on the test machine with the PCI connection, I am guessing I do not have a faulty hardware issue. I did try replacing the PCI connection on the test machine with another GPIB-USB-HS but my app is still not able to send commands to the GPIB equipment. But, through MAX I am able to send commands to the GPIB equipment over the new connection.

 

I was thinking there was some kind of difference needed in the code to use the PCI connection, but the behavior of the USB replacement has me confused.

 

Any ideas?


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