Synchronize 2 USB-DAQ devices, Analog IN, Frequency IN, Digitally triggered

Hello,

I want to perform the following measurement on two USB-6211 devices, LV 2012:

I need to

1) read (cont.) all 16 analog input channels of Dev1

2)  read( cont.) 2 analog input channels of Dev2

3)  perform a frequency measurement with Dev2

4) synchronize 1-3

5) start the Measurements with a trigger (light barrier)

1) and 2) are not the problem. Also synchronizing them is fine. But I am not sure if my attempt to synchronize all this with the freq measurement, as this is done over a certain period of time. So, as I understand, when I select the method "high frequency with 2 counters" I can specify the measuring time. So I think I need to tell labview somehow which point of time of this span shall be synchronized with the analog input.

I attached a first try and am thankful for any hints.

Thanks, Jack