NI max cannot find VISA resource name for NI GPIB USB HS device

[zyb1003]

Hi guys

I want to use labview to connect Agilent PNA Network analyzer using GPIB cable.

Labview cannot found visa resource name of it, just shows like below. I tried ways of reinstalling NI 488.2 and restart the NI GPIB Hardware Enumeration service, but still not working.

Any thoughts?

Thanks

[crossrulz]

First the stupid things:

1. Is the PNA set up to communicate over GPIB?

2. Did you hit the "Scan for Instruments" button?

[zyb1003]

Hi, thanks for the reply!

The GPIB setting on PNA has no problem.

When I hit on scanning for instruments, the system shows me cannot find any instruments. 

[zyb1003 · Accepted solution]

I found the problem. There are 2 GPIB ports on the back of my VNA. One is for connecting external device, one is not. 

[crossrulz]

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@zyb1003 wrote:

I found the problem. There are 2 GPIB ports on the back of my VNA. One is for connecting external device, one is not. 

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Ah, you have one of those.  Yes, I have had that problem myself.  One of the reasons I prefer using the Ethernet connection instead of GPIB.