I have a wierd situation:
I am using a NI 6509 Digital I/O card, with 4x digital outputs connected to P2.3 thru P2.6.
1. I setup a task to write to these lines using a group of global virtual channels - all done in MAX.
2. I have used this task/setup on previous occassions with good success.
3. Yesterday it stopped working.
4. Now the old task does not work.
5. I have reset the device (and PC) on multiple occassions
6. I created a "NEW" task which writes to the whole port at once (i.e. U8) and I can measure the output voltage changing fine (using DMM) when I run this VI.
7. So I know that the digital outputs are working... but when I try the old task again, it still does not work.
Can anyone please tell me of a reason why this behaviour might occur. I know that some DIO products can do port read/writes only.
I am suspicious that the device (our product) the DIO card is connected to might have been accidentally connected in such a way that there were two competing output signals/pins connected to the same wire.
Does this sound like a hardware fault?
Any suggestions muchly appreciated.
Thanks!
