DAQmx - merging device name and channel names ?

Hi all,
There is probably a extremly simple solution to this, but I didn't manage to find it !
I use LabView 2009 and 2010.
I'd like to concatenate the strings "Dev4" (device chosen by the user in the GUI) and e.g. "PFI0" to get a string that I could connect directly to a DAQmx vi.
Is it possible to do that ?
Thanks a lot for your help !
JB
JB

Hi,
I'm back again with this problem.
Concatenating strings works fine for strings like "Dev3/ai0" for example, like this:
but when I try to do the same kind of thing for a ai trigger source (in my case "/Dev3/PFI1"), it doesn't work. Here is how I try to do it:
When I put a probe on the wire at the far right of the screen capture above, I get what I want, ie "/Dev3/PF1", but no trigger are received and there is no error message. Everything works fine when I simply use a constant like this:
I don't really understand why it doesn't work. Any clue ?
Thanks for your help !!
JB

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What exactly are device number and channel number? I am assuming device number is the number given to the DAQ board (i.e. "1") and that channel number is the number on the screw terminal board where the signal of interest is located. Is that right?
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Device number is the number given to the DAQ board. You can use MAX (Measurement and Automation Explorer) to verify the device number. It will be displayed in the device's property window. Channel number depends on the device. If you have a 16 channel Analog Input DAQ, your channel numbers will range from 0 to 15 (or maybe from 1 to 16, depending on the board). It may NOT be the same as the screw terminal on the connecting block. The documentation that comes with the board and the terminal block should show which channel goes to which screw terminal.
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I've created a task for digital output that contains 8 named channels using the DAQmx Create Channel VI in Labview. Is it possible to use the channel name as an input to the DAQmx Write VI to reference the desired channel? I tried wiring a string with the channel name to the "task/channels in" input but I get a -200428 error that says the Value passed to the Task/Channels In control is invalid.
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George,
I think that there may be some confusion here about the difference between local and global virtual channels. First of all, please take a look at the following knowledge base:
Physical Channels, Virtual Channels, and Tasks in NI-DAQmx
As discussed in this KB, local global channels are created inside a task, and they only apply to that task. In the help file for the DAQmx Write VI, the "task/channels in" description says "if you provide a list of virtual channels, NI-DAQmx creates a task automatically." When you wire a string to this input, a new task is being created, and unless the channel name that you wire in is a global virtual channel (listed in MAX), you will get the error 200428 that you mentioned. This is because that virtual channel that you are specifying is local to another task and is not associated with this new task.
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The help text is still correct, but is only applicable in certain situations. For example, if you create and name an analog input local virtual channel with DAQmx Create Channel, you could then use this channel name as the source input to a DAQmx Trigger VI configured for an analog edge start trigger. You could also use that channel name as the input to the "ActiveChans" DAQmx Channel Property, which would enable you to modify the properties of that particular channel.
Hopefully this information is helpful to you.

How to define in different controls device and channels in a DAQmx function?

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I need to build a vi that permits the user to change the device of a DAQmx acquisition system, although I don't want that the user modify the input channels. I`d like to know if it is possible to define in different controls device and channels.
[]´s
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Hello Juliana,
What you would like to do is possible with some simple string manipulation. First you will need a Device Name constant from the DAQmx >> Advanced >> DAQmx Constants & Property Nodes palette. Right-click on the constant and turn it into a control. Then, use a concatenate strings function to join the device name with the rest of the characters you need to define your input channels. Wire the output of the concatenate strings VI to your DAQmx Create Channel VI.
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Solved!
Go to Solution.

labview12110 wrote:
Im just frustrated that the only function I have is to get a list of things that I can't do anything with. MAX knows which is active can I call it up somehow?
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Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.
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Daqmx device name

Hello,
I am writing a LabVIEW program that is used on many computers in our teaching labs and therefore the Daq device may not always be named "Dev1" in Max. My first pass is a subvi (attached) which scans the Dev Names until it finds a product match and return the device name. I would then append the port, line or counter to the name. This gives me coercion dots and there doesn't seem to be a conversion fuction between strings and I/O.
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daqdevname.vi ‏25 KB
FindDaqDev.vi ‏24 KB

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DAQmx - merging device name and channel names ?

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