syncronize two DAQ cards

[Tomas_E]

I have two NI 6229 USB cards. The clock is syncronized by sending one of the onboard clock to the PFI of the other.

Now the problem is the starting trigger for both the two boards. I prefer not using an external trigger from another instrument. I do have a third DAQ card(NI 6703). When I use one of the digital line to trigger the two 6229 cards, it looks like the task-starting function(VI) is waiting, so the followed 6703 digital line state changing function(VI) cannot be executed.Thus made a dead cycle.

Is there an easy way for task start syncronization in software? Or some other way to syncronize?

thanks

[Tomas_E]

Today, I found the external trigger actually does not function. The function/VI is "DAQmxCfgDigEdgeStartTrig". While using the debug mode, error appears as "-200452": Specified property is not supported by the device or is not applicable to the task.

[John_P1]

Hi Tomas,

It would probably be helpful if you posted your code.  What type of task are you trying to trigger?

Best Regards,