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Both detectors need a DAQ trigger to label events that the DAQ system wants to save.  All the timing of the integration window position depend only on the run trigger or the arrival of the specified event code.  The DAQ trigger only specified that the DAQ system wants this frame, so ti's arrival time is not critical.  The DAQ trigger must arrive after the run trigger, but no more than 500 microseconds after it.  The software looks at the configured delay of the run trigger, and adds 250 microseconds to that for the setting of the DAQ trigger delay.  This scheme means that you set the run trigger delay to set the position of the integration window and the set the DAQ trigger delay to the same value, so the software will place the daq trigger in the middle of the window.