niSwitch software scanning

[Dario Moretti]

I need to do software scanning of niSwitch as indicated in the NI example "niSwitch Software Scanning.vi".
I have a great scan list (something about 100 instruction).
What I notice is that if the first software trigger sent is not delayed of a certain time, the trigger is lost (maybe because until the scan list download is not finished the triggers are discarded).
How can I know if the download is finished?

[Guy Ferraro]

Dario,

Actually when the flow returns from initiate the scan list is already downloaded. The loop will not execute until the scan list is completly downloaded. What might be happening is that the trigger is being sent before the first connections in your scan list gets completed.
For example if the first instruction in your scan list is: ch0->com0 & ch1->com1 & ch2->com2; and if the trigger is being sent before the switch is done making ch2->com2, the switch will not be in the "wait for trigger" state and therefore will miss the trigger.
To ensure the switch in the "wait for trigger" state, use a property node with "Is Waiting For Trigger?" found in Scanning configurations. Place the property node right before "Send Software Trigger".

[Dario Moretti]

Yes, it is as you said.
I inserted a while loop (with timeout) waiting for property node flag "Waiting for trigger?" becoming TRUE and now it works.
Thanks
Dario

[Guy Ferraro]

You are welcome. I am glad it is working for you.