Getting data from Multiple cDAQ racks at the same time.

I need to combine an 8 port cDAQ rack and a 4 port cDAQ rack and was hoping someone can help. I do not need the signals to be synced up exactly, but I can’t handle the 50ms delay that I have now. The signals on the 2nd rack is more for customer reference and the 1st rack is doing all the real analyzing.
I need to collect samples at 500hz or every 2ms and I collect 25 samples giving me a chunk of data every 50ms. The DAQmx tasks seem to pull at the same time, therefore the cDAQ2 In chunk is always 1 scan behind causing a 50ms delay.
Is there a better way to pull this data without having such a large delay? I did not see anything in the examples that apply to my particular application and hardware.
Thanks,
Doug

Each task will begin sampling data as soon as you start each task, so in order for each task to be synced, you want each start task to occur at as close to the same time as possible. One way to try to do this is to put the start tasks together in a sequence structure. This will ensure all your cofiguration steps for both tasks are complete before you start sampling. How long are you runnig your application for? If its not that long, I wouldn't worry about one of your chassis running faster than each other. If you think that is becoming a problem, there are ways to diagnose that, but that would take a significant amount of effort.
I have included a snippet of how you can try starting your tasks together
Applications Engineer
National Instruments
Attachments:
start tasks together.png ‏21 KB

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Getting data from Multiple cDAQ racks at the same time.

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