Your most recent post links to a more advanced-sounding example & I recommend you stick with something simpler to get started.
Your very first post links to just such an example where the pulse train signal will come out of Ctr0_Out. Ctr1 is used to do the retriggering and to "pause trigger" (enable / disable) Ctr0. However, much of that stuff is configured using some nice DAQmx features such that you don't need to physically wire any pins between the two counters.
The only physical wiring you need is to connect your physical digital trigger signal to PFI1, and to connect Ctr0_Out to whatever external thingy needs to receive them. As long as your device is named "Dev1", I would expect that first example to work.
I know there are some helpful docs around to give more general info about counter pins & behavior, but I don't recall quite where as I haven't looked for them in many years. Meanwhile, here's a *little* bit of general description I wrote myself once upon a time.
-Kevin P
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