01-22-2014 11:03 AM
Hi,
I use NI 6368 DAQ card. I would like to start digital acquisition on the first rising edge ( first 1) without using an external source. Sounds like I can't use Onboard Clock since it is in use for digital acquisitiion. Could you please let me know how can I do it? Do I need software trigger?
Thanks
01-22-2014 03:32 PM
Any help really appreciated
01-22-2014 03:43 PM
01-22-2014 07:15 PM
Yes it supports both but how can I set it. For trigger I need a source. How should I set the source to start acquisition on first detected transition on that digital line?
01-23-2014 06:06 AM
You may select the any Analog input channel from 0 to 15, as your card supports that.
So if the rising edge signal needs to be connected to analog input and select the trigger source as that channel
http://zone.ni.com/reference/en-XX/help/370469AB-01/lvdaqmx/mxtrigger/
01-23-2014 08:23 AM
Just connect a physical wire from your first digital input line (e.g. P0.0) to one of the PFI lines and use that as the trigger. When your signal goes high, it starts acquiring.
01-23-2014 09:37 AM
Another option would be to have it just continually acquiring and do a "software trigger" where you just start saving / processing the data once it goes above a certain level.
01-23-2014 10:38 AM
Do you ahev any suggestion or an example on how to do software trigger on digital signals
Thanks
01-23-2014 02:50 PM
Has anyone any suggestion on how to use software trigger for a digital line. I could find this example but it is for analog
https://decibel.ni.com/content/docs/DOC-11764
01-28-2014 10:27 PM
any help is really appreciated. I can't use any PFI line or analof lines since they are all in use so I can't use an external hardware trigger. I would like to start acquisition as soon as seeing the first rising edge on my digital line.