Connecting more than one sensor cable to screw terminal to collect more than one signal in single DAQ board channel?

[bsteinma]

I don't know if this topic is being posted in the correct location. I am new to LabVIEW and the hardware associated with it. I am using an NI 9237 DAQ board for a senior design project in engineering and I was informed that I can make multiple connections to a single screw terminal which in turn will connect to one channel of the DAQ board. To give the specifics, I have two pressure transducers and would like to connect them to the same screw terminal and channel on the DAQ board yet separate them when acquiring data in the VI. Does anyone know how to do this? I know is is essentially knowing what pins do what on the screw terminal but I can't find this anywhere. I am currently doing the job with two screw terminals and two of everything else (RJ50 adapters, etc.). I would appreciate any input. Also, please let me know if I am posting in the wrong board and if possible, which board I should be posting to. Thank You, bsteinma

[RavensFan]

No.  That can't be done.  Who informed you that it could be?

How do you expect the hardware and software to pick out one signal versus the other?  If you put two wires into the same screw terminal, you have electrically tied them together.

Message Edited by Ravens Fan on 02-05-2009 12:34 AM

[ColeTrain]

bsteinma,

What you may have heard is that you can measure multiple signals on the same task, not on the same channel.  By tying both of these signals to the same channel, both signals will compete to drive the line.  The channel on the card will only interpret this garbled signal and you will get no useful data.  If you are new to wiring up hardware, I recommend configuring a task within Measurement and Automation Explorer and then clicking on the tab along the bottom of the page titled, Connection Diagram.  This will show you what electrical connections to make.  Then, in LabVIEW you can read multiple signals (channels) and manipulate each signal how you would like.  

As far as boards go, you will generally find an answer where ever you post, but the Multifunction DAQ board is a great place to post when you have questions regarding hardware (like your 9237).  

Cole R

Applications Engineer

[bsteinma]

Thanks Cole Train, your input was helpful and informative.