Acquisition of signals according to schedule low external digital input state

Hello

I use DSA devices namely PCI-4472 and PCI-4474 for data acquisition. Our application requires that these councils should acquire data as long as input digital external is in DOWN state that is to say that the device should start acquiring on falling edge and stop on rising acquisition. Unfortunately, I could not find a method to do, which is independent of the number of samples sent to the called function. If I set up the device in this configuration, it starts after the first falling edge and stops on rising edge. But if no. samples to acquire (N = value passed to the called API function) is less then the total no.. samples which are to be acquired (between start and stop say N + X m), the function only returns me the N number of samples during a fall X samples.

Similarly if no. samples between edges of slopes and trigger signal (Y for example) are less value (N) was passed to the API function called, the function return always N = Y + Z, even if we do not require z. samples.

I tried to check this thing in MAX. Can someone help me get around this problem?

Concerning

Mnuet

Sorry about that. I realized while I was writing my response to your original question, you had already posted back. Preston is correct, I was trying to find a way that you could do a digital reading to control the level of the PFI 0 line, but the DSA maps do not have circuits to allow you to make digital reading. The only way you could check the line would be to use a digital I/o card.

Kind regards

Frédéric

Tags: NI Products

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