Instrument Control (GPIB, Serial, VISA, IVI)

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multiboard system

may be someone of the readers could help solving my problem. A
controller AT-GPIB/TNT (WinNT 4, Svp4) works correctly with some
devices, same for an other PCI-GBIP (Win98). But connecting both
"networks" hangs the bus, in spite of proper settings
(controller/non-controller, EOI, ... as described in user manual, no
conflicts on PC with IRQ,...). I've tried to vary communication
parameters, to install original card drivers from manufacturer, ... -
when both cards are connected to the same bus then nothing works
properly, also the NI software doesn't correctly detect other devices
during a scan in contrast to before. At the moment I don't know what to
check, to try... any ideas are welcome.
Thanks a lot.

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