Why am I occasionally getting a "no listeners" error with my GPIB communications

[trosier]

I have an application that is using a GPIB-ENET/100 controller to command a power meter and a spectrum analyzer. Using NI Spy I am getting timeout errors which are not really hurting anything. What does hurt my testing is when I get a "no listeners" error which pretty much halts my application. One other thing to add is that I cannot duplicate this on my development machine. It is only on the machines that are running the application which this happens. I don't get the timeout errors either on my development machine. Is there something unique to applications vs the development VIs that I should be aware of? All machines are running XP. I am using the Instrument Assistant to write to and query my spectrum analyzer. So when debugging this in the application I cannot open the Instrument Assistant VIs to run commands individually and like I said I cannot duplicate the problem on my development system so that does not help. Any help would be appreciated.

Thanks,

Troy

[Weiyuan]

Is the application machine has some debug program like MAX.  Does the development machine has a GPIB board and actually connects to the instrument?  Is the GPIB board in the application machine works properly?

[trosier]

The application machine does have MAX on it. That is how I am using NI Spy. I am using the same GPIB-ENET/100 for both the application and the development machine. Only one machine is ever accessing the controller at any given time.

[Weiyuan]

Is that could be something's wrong with the GPIB-ENET/100 controller on the application machine?  Hardware problem?

[Krista H]

Hi,

You will need to make sure you have NI-488.2 installed and this should install MAX. You will first have to setup the ENET 100 in MAX before you can run your program.