DAQ Assistant Channels

[laps682]

Hello,

I have a DAQ with 4 channels with analog inputs. Right now, I am only using ai0, the first analog input channel which I configured by going directly into the DAQ Assistant block and choosing the channel. I am soon going to have to use multiple channels, and I would like to make a user-friendly interface in which they choose which channels to make active. My thinking was making 4 toggle/switches for each channel which the user can easily make active/inactive and plug in the appropriate wires to the physical channels. 

How do I go about doing this; how and where do I connect these booleans to do what I described? Thank you.

[GerdW]

Hi laps,

your task will become easier once you get rid of the DAQAssistent and use plain DAQmx functions!

You still can use 4 buttons then (or an array with 4 button elements): with each enabled button you can add/append another channel to your channel string…

[crossrulz]

I'm just going to redirect you to a recent thread: https://forums.ni.com/t5/LabVIEW/Selecting-channels-with-a-Boolean-control/m-p/3819305

[JÞB]

First, don't go with the bool or four bools  Use a listbox with the output as array and selection mode 0 or more (auto index the indices to build the channels from the array of selections)

Ala Kazam!

Nicely SCALEABLE!

Second, DON'T DO THAT!

So, You got 4 AI Channels.  Read them ALL ALL THE TIME!  Use The Plot Visible Property to display only what is interesting and (Just saying here) Read the plot visible property to stor only the channel data of interest *(to TDMS of course)

NOTE: The For loop should auto-index on all AI, My device has more than 4 AI.

[GerdW]

Hi Jeff,

Nicely SCALEABLE! Second, DON'T DO THAT!

There are cases where you don't want to read all available channels. In such cases you only put the channels in the task that you really need!

Example: using a multiplexing ADC DAQ card and you want/need to minimze the (timing) delay between the samples…