How do I create a DAQmx Channel property node?

[sangbui_palpro]

I am trying to put my PXI-4472 into AC-couple mode by creating a DAQmx property node, then modify the property.  However, there's no property available when I wire "DAQmx Create all channels" task out to the generic property node.  The physical channel is wired to the "DACmx create all channels".  I double-clicked to open up the DACmx VI, and all property turned black (invalid property) everytime I tried to modify any of them.  I downloaded working examples, DAQmx Create channel (Al-Voltage-Basic) for instance; it was ok when I just only ran the VI, but I'd get broken arrow if I force-compiled the VI (Ctrl+shift + run) due to the same DAQmx property node problem.  The hardware is in the system and it works.  Please help.

SB 

[CharlesD]

To put your PXI-4472 into AC-Coupling mode you must use a DAQmx Channel Property Node.  This property node can be found under: Measurement I/O --> NI-DAQmx --DAQmx Channel Prop Node.  From this wire the task out of the DAQmx create virtual channel to the property node and the select ai Coupling under: Analog input --> General Properties--> input Configuration --> Coupling. 

Check out the following attachments to enasure you are using the proper property nodes as well as if you need more info on where to find the property nodes. 

If the above does not fix the problem...Which DAQmx VI are you trying to open which then turns the property nodes black?  Could you post a screen shot of your code so we could see what is going on? 

Also is it possible that you have not installed DAQmx properly or that DAQmx has become corrupt?  If so  either repair the driver from the control panel, or re-install DAQmx to ensure that the driver is still in good shap.

Good luck!

[TCPlomp]

There is an alternative to create a DAQmx class:

Ton

Message Edited by TonP on 01-28-2009 07:55 PM

[sangbui_palpro]

Hi guys,

Thanks for the help.

 I had DACmx 8.5 running with Labview7.0.  I uninstalled DACmx and reinstalled with 7.0 version which fixed all broken arrows.  However, my PXI-4472 no longer shows up in DACmx device category so I really have no control over it using DACmx property node.  I've tried to convert the hardware (PXI-4472) from traditional NI-DAQ to DACmx device my "no matching device" result came up.  Is there any remedy to this without upgrading DACmx version?

SB

[CharlesD]

First off DAQmx 8.5 does not support LabVIEW 7.0. 

The PXI - 4472 is supported in DAQmx with DAQmx 7.2 or higher.  In DAQmx 7.1 the PXI-4472 is restricted to traditional NI-DAQ.  DAQmx 8.2 and lower support LabVIEW 7.0.  I can therefore recomend that you install any DAQmx versions between 7.2 and 8.2 and that should resolve the problem.  Please check out the following Knowledgebase Article regarding driver and software compatibility.

http://digital.ni.com/public.nsf/allkb/97D574BB1D1EEC918625708100596848

Hope this helps!