@TC,
you missed the 3 second delay- don't sweat it too much! but, there is a HUGE difference between sample clocks and samples acquired:smileywink: I really do recommend reading the help file it is fairly pointed on what the function does and when it is potentially useful....
Beyond those limited use cases...... it really depends on what the hardware supports if the function COULD return "Is Late?" = True. I jumped in "Splashing!" on the thread because it went down the wrong road. Someone BLUE Should have beaten me to the punch and asked about the hardware attached. Yet, the OP was so offended by expected bahavior and ....
For what it is worth- I learn a LOT from my mistakes too... Many of those mistakes are availablefor public viewing on these forums.