For single notification send, I am receiving notification continuously. why?

[RajGru]

Hi all,

Initially I created 4 notifiers and formed an array of notifier references. 

And there are two loops running in parallel.

1. Send Notification loop - When 'Send' button is pressed, a notification is sent in the corresponding notifier(One among the 4 notifier)

2. Receive Notifcation loop - this loop checks for notification in all the 4 notifiers and display the data when a notification is received.

In the Send Notification loop, I sent one notification using one of the notifier references. But in the Receive Notification loop, I am continuosly receiving the same notification for multiple times. For single notification send, I am receiving notification continuously.

This problem occurs only while using an array of notifiers. 

I have attached the sample vi.

Thanks in advance.

Raja

(LabVIEW 8.2, Windows XP) 

[TCPlomp]

If you are constantly listening to different arrays (as you do inside the for-loop), the 'latest' notification will be continously resetted, so listen to multiple notifier, use the 'Wait on multiple' notifier function:

This function returns an array of the notifiers that didn't time out.

Ton

Message Edited by TonP on 06-29-2009 04:35 PM

[RavensFan]

This doesn't explain your current situation.

But perhaps you should be looking at "Wait on Notification from Multiple".

[RajGru]

Hi Ton,

Thank you for your reply. Now its working fine with 'Wait on Mulitple' notifier function.

But I don't understant that if I send a single notification, how I receive multiple notifications. With single Notifier, if I send one notification, I receive only one notification. In the same way, it has to work with multiple notifiers. ie, if I send single notification through one of the multiple notifiers, I should recieve only one notification in the corresponding notifier alone. Then why I am receiving multiple notification for single notification send?

If my understanding of notifier is wrong, please correct me.

Thanks

Raja

[TCPlomp]

Since you have a single 'Wait on Notifier' node inside the for loop, every iteration LabVIEW noticies that it gets a new notifier reference, when a new notifier reference is provided LabVIEW will reset the previous notifier time.

Ton