How to start acquisition on rising edge without using external source

[tintin_99]

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

[tintin_99]

Any help really appreciated

[Dennis_Knutson]

Triggering is separate from an external clock or the onboard clock so your question does not make much sense. Your board supports both analog and digital triggering.

[tintin_99]

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?

[AB@17]

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/

[josborne]

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.

[BowenM]

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.

[tintin_99]

Do you ahev any suggestion or an example on how to do software trigger on digital signals

Thanks

[tintin_99]

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

[tintin_99]

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.