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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
07-22-2010 03:53 AM
There are quite a lot channels.
Does I need to check the channels one by one to see if any signals coming in.
Or there is another correct way to do it.
Thanks.
07-22-2010 12:20 PM
Explain a bit further. Each time you do a DAQmx Read, there are signals coming in. Do you need to detect if there is a specific signal being read?
07-22-2010 06:20 PM
If it's possible to have data from all channel, and you really have no idea which one will come in, yes, you've to check it one by one.
07-22-2010 09:12 PM
Is there a sample for checking one by one, thanks.
07-22-2010 09:20 PM
If you don't tell anyone the difference between no signal, and signal existed, how can anyone answer your question?
Please try to put more effort on your work.
07-23-2010 02:26 AM
When there is no signal, the input is just a 0 level voltage.
When signal come, it will be a 50Hz sine wave with several second duration.
I am not sure if the card can do simultaneous data collection. Just wonder any standard mechanism or function block for polling multi-channel with good performance.
Thanks.
07-23-2010 03:13 AM
refer to attached file