Session base level trigger of analog input NI USB daq.

I'd like to set up an analog input channel of an NI USB daq to level trigger with a session based approach. What is the session based equivalent of the following?

    set(s1,'SamplesPerTrigger',500000)
    set(s1,'TriggerChannel',chan4) %Trigger Channel
    set(s1,'TriggerType','Software')%Immediate, Manual, or Software
    set(s1,'TriggerCondition','Rising')%Rising, None
    set(s1,'TriggerConditionValue',1.5)% Trigger level
    set(s1,'TriggerRepeat',0)
    set(s1,'TriggerDelay',-1.0)% pretrigger (seconds)

Thanks, Jon R2012a

Answer 1

[AndTim]

Hi,

As far as I know, triggering to a certain level is not possible with the session based approach.

In principle, the equivalent to the legacy approach starts like this: (assuming session is already created, 'CHANNEL' would be the trigger channel on your card)

trig = session.addTriggerConnection('External','CHANNEL','StartTrigger');
session.TriggersPerRun = 1; 
trig.TriggerCondition = 'RisingEdge';

Now you would have to change

trig.TriggerType

to 'Analog' in order to be able to do leveled triggering, but as far as I know that is not yet possible.

Best, Tim