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R&S SMT signal Generator locksup when Labview triggers a frequency sweep

I'm interfacing Labview to a R&S SMT signal Generator via the GPIB bus, when i run a frequency sweep, the SMT locks up, it won't switch back to local mode and Labview gets a timeout when it tries to talk to it, any ideas what might cause this?

i trigger the sweep and the SMT will perform the sweep, but then it won't respond to anything else when the sweep is completed. i can stop Labview and it won't switch back to Local, and if i try to wtiye to it again with LAbview the write command times out. I'm using Labview 7.1, and a NI PCI-GPIB card
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