Continuous data acquisition

Dear all,

I have an oscilloscope (DPO4104B) and use the certified LabVIEW plug and play instrument driver. I want to do continuous data acquisition (1 kHz repetition rate) with a trigger signal and afterwards send all the acquired data (or just the mean value) to the computer via USB. Unfortunately I cannot get my program run with the help of the manual and the driver description. In my block diagram the following subvi's/commands are run sequentially;

1. initialize.vi

2. configure delay trigger.vi
3. configure continuos acquisition.vi
4. visa write; "ACQTATE ON";
5. program waits for 100 ms to acquire data
6. visa write; "ACQTATE OFF";
7. read waveform measurement in memory.vi
8. close.vi

I get the error that there is no waveform to measure.
I would be really grateful for some help since I'm stuck with this problem for a long time now.

Cheers, Greg