Establishing communication with GPIB devices

I am a newbee to GPIB and a novice at VB (6.0). Have been unable to establish communication with devices from the VB .exe. I think I am not declaring something in the right place? Any suggestions?

TG,
What kind of trouble are you having reading data from the instruments? There's information that addresses some of the common issues about why communication with instruments might fail. For more information, please refer to:
Why Can't I Communicate with My GPIB Instrument?
A couple of useful tools that you can use to check out communication to the instrument before writing your Visual Basic app are NI-488.2 Communicator and
Interactive Control (IBIC)
If you are still having trouble after trying out some of the suggestions listed above, it would be helpful if you capture the ibwrt and ibrd calls using NI Spy, save the Spy capture, and then attach it to this forum. If you are unfamiliar with Spy, here's a link with information about how to use Spy:
NI Spy
Hope this information helps with getting data back from the instrument.

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[email protected] (Gerd W.) wrote in message news:<[email protected]com>...
> When running my program to control a measurement, everything works fine.
> The program can communicate with all the GPIB devices. When I start
> the program again (without rebooting Win2K), from time to time it
> refuses to communicate with the GPIB units. Now I found out it helps
> to start MAX2.2 (Measurement & Automation Explorer) and to scan the GPIB
> bus. MAX identifies all devices without problems and my LabVIEW program
> also runs fine now...
> So why do I have to call MAX to have my LabVIEW program have a communication
> via GPIB?
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to close it properly when your software exit, oth
erwise the resources
may be locked up. And by using MAX somehow the resources is freed by
it after it's operation.
Irene
www.geocities.com/irene_he

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Hi SmithD,
I would like to say thank you very much for making out time to respond to my queries. I have done as directed but still not getting result. Following the wire mode port setting configuration, I stopped the process and then selected the RS485/wire4 as the wire mode. On running the VI, an error pops up with the information that the Visa resource is Valid but the port cannot be accessed. I noticed that If I undeploy the shared bound variable the error does not pop up anymore. I concluded that maybe I was not supposed to have added the VISA configure Serial port in the first place.
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See attached.
Attachments:
Save_Previous_10_SecondsMOD3.vi ‏27 KB

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All,
I have been working on a VI whose function is the following:
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Attachments:
DAQ issue VI.vi ‏124 KB
sample output.txt ‏1230 KB

Wayne,
Thanks for your reply. Unfortunately, my knowledge is limited in this area. We are using an ADU208 USB relay from Ontrak (information here: http://www.ontrak.net/ADU208.htm). We are using the bundled subVIs to open/close each channel of the relay depending on the acquired data. How could this relay board affect the DAQ communication?
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