Is there any proper time delay that I can refer to for a ChangeDetection interrupt?

[JoeGoz]

Hello,

For the change detection function in PCIE-6509 /USB or similar, the manual indicates that:

When an input change occurs, the NI USB-6509 generates an interrupt, and the NI-DAQ driver then notifies the software.

I suppose we can consider the hardware interrupt generates super fast as it's  ASIC based. But what is the possible time range that it gone through the driver and hit user's software ?(e.g a C#.NET software in low CPU load) .   Is 1us level reasonable? Thanks.

[Kevin_Price · Accepted solution]

This is not a definitive answer, but based on long experience with DAQmx under Windows I would tend to plan for several 10's of usec minimum.  I don't think it'll be realistic to hope for single digits of usec regularly.

-Kevin P