> Im new to LabView and my first project is to sample 2 channels in at
> least 20Khz, calculate the length of the vector between these two
> channels (channel 0 is X, channel 1 is Y). When the legnth is over (or
> under) a certain value I want to send a character on the COM-port.
> I made a small "test" in VC++ (as my knowledge in LabView is quite
> limited yet) to test the time from the signals in on the channels
> until we get the character out on the COM port. The result was 0.5 to
> 4ms. Quite OK I thought.
> Ive now "converted" the program to LabView and I was quite
> dissapointed by the result which in LabView is 150-300ms.
>
> I use NT 4.0 as OS.
>
> My questions are:
>
> 1. Are the figures above normal?
> 2. Can I somehow take the VC++ code and put
it in LabView to get the
> same performance?
> 3. Is there open source device drivers to download somewhere?
> 4. Can I read further on this topic somewhere?
>
My guess is that you should open and configure the COM port in advance,
then look at the signals. That way only the write is required when the
event takes place.
As the other post suggested, you should upload your VIs.
Greg McKaskle
