Hi I have an old application involving GPIB and RS232 communication with several instruments. For GPIB I use the oldest 488.1 VI's. Everything, datacollecting, storing, etc, are done in separate parallel loops. There are also a DDE server in a separate loop to hold all collected data. We use it for distribution of data online to several networked connected computers. Excel is running on this clients for evaluation purposes. Recently I added possibility to use three new types of GPIB-instruments. Then I use VISA-routines. It works very well BUT the DDE server has turned very slow. Before it updates 200 channels of data in 1 s now it takes 60 seconds. When I changed VISA routines to GPIB 488.1 all is working perfectly, DDE is okay again. I think this is strange, what have VISA to do with DDE? Do anyone have any clue? (LV 6.001 Win NT)
