I use the NI GPIB-USB-HS device to communicate with a Fluke45 DMM and it has been working 100% reliably in a VB.NET program until recently. When I issue a GPIB.WRITE command an exception is thrown along with a "No Listener on the GPIB" prompt. I have verified the proper primary address is being used by the GPIB object in the program but as soon as the following statement is executed the exception occurs ...
GpibDevice.Write("VAC")
This serial communications has been working flawlessly for the last 10 years and then it just stopped working. I can still communicate with the Fluke 45 using NI MAX and the VISA debug tool.
Curious to know if anyone has any ideas or has been through this already.
Thanks
George Komisar