create virtual channel list

[gnunesjr]

Greetings all-

I'm building a system with a lot of digital I/O for mechanical control.  Sometimes I need to write to only a single output, sometimes I need to write to groups of outputs.  When I write to groups, I would like to create a list of virtual channels, and wire that to a single instance of the DAQmx Write VI.  (And similarly for inputs....)

The challenge is that the exact grouping depends on the circumstances, and I have not the patience to create in advance a list for every possible combination of physical channels that might occur....

What I have done so far is create a single virtual channel for each physical channel in the system and stored them all in a functional global.  Now I would like to be able to combine these virtual channels into lists programatically.  

Is this possible?  Otherwise, I will just have to make lots of sequential calls to DAQmx Write....

Thanks in advance,

GN 

[MikeS81]

Hi gnunesjr,

you can handle the channels like strings. You can combine them with the "concatenate string" function.

Hope it helps.

Mike 

Message Edited by MikeS81 on 08-26-2008 07:44 AM

[gnunesjr]

Mike-

Thanks!  Do you know if this works on the tasks rather than the physical channel names? 

I actually tried wiring tasks together using the concatenate operator before I posted.  I got lots of little red type conversion triangles, but no broken wires.  For very boring reasons (personal bandwidth not infinite, etc.) I'm not at a place where I can run the VI while connected to the hardware, so I don't know if it was going to work.  I should be able to test against the hardware in a week or so.  If no one has posted an answer by then, I'll report back to this thread with the results of that little experiment.

-Geoff