HP 34401A - wait on event in Wait on RQS

Hello,
i'm in a desperate situation. I want to measure resistance with LabView 7.1 over GPIB. The equipment i use is the HP 34401A multimeter. For many times it was no problem. The single read example worked without failures and returned the measured values.
Then a short time later, nothing worked as before. I always receive this error: "VISA Wait on Event in Wait for RQS.VI->HP34401A Read Meas.vi->HP34401A Single Read Example.vi"
I know this question is not asked for the first time. But the answers given in the other threads don't help.
The timeout time i changed from 10000 to 60000 ms. The failure is in the wait for RQS.vi .
Please help me, that would be very kind!
Thanks a lot
Greg

I have one of those multimeters as well, and use it from time to time in a program to verify the voltage from a power supply...
I always use the method in the vi attached, since I've always found it easier (again, easier for me anyways), since you can control everything. You may want to vary the wait in between the read and the write, since my meter is an Agilent (newer than if it says HP...they had to branch it off for some reason), and it might be different, but I doubt it.
All the commands are in the manual... Hope this helps,
Geoff
Attachments:
GPIB Write-Read.vi ‏22 KB

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I have a wait for event step in my owrkflow and it is working fine. My problem us i am not able to trigger this event using program can anyone please let me know what i am doing wrong. following is the code i am using to trigger the event
DATA: key TYPE SWEINSTCOU-OBJKEY,
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Hi
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