'No physical device detected' in DAQ Assistant

[soralee]

Hi,

I got PCI-4070 FlexDMM with LabVIEW 7.1, and SCXI-1127 (switch). When I came to select physical properties on DAQ Assistant, it stated that "no supported devices found". I remember that previously when I tried to configure DMM property in Max, the property options was dimmed out indicating that I could do nothing with it.

Can anybody figure out what the problem is? Thank you in advance. 

[AllanS]

Hello Soralee!

You will not be able to configure the DMM and switch inside a DAQ Assistant.  This express VI is limited to devices which utilize the NI-DAQmx driver.  Therefore you will not be able to setup your DMM and switch from this VI. Very shortly there will be an express VI included in the DMM driver that will allow you todo this.  For your best bet is to start with an example VI that ships with LabVIEW.  Simply goto Help>>Find Examples. In the subsequent window goto Hardware Input and Output>>Modular Instruments>> NI-SWITCH and select the niSwitch DMM Switch Handshanking.vi.  This will allow you to see the code for switching. Please refer to the NI-Switch helpfiles to be sure your external connections are correct.  I hope this helps and have a great day!

Allan S.
National Instruments

[soralee]

Hi Mr. Allan,

Thank you for your kind reply. Related to it, I would like to post some other questions if you don’t mind.

I need to get data from 16 channels so I think niSwitch DMM Switch Synchronous scanning will help me do this. I don’t use Handshaking since from what I read our SCXI-1127 doesn’t have front connector to allow us doing this.

I haven't connected any of these channels to signals I want to measure. So I try simulation by changing the option for niSwitch Initialize with topology (Simulate = yes). I also simulate the DMM using this string: “Simulate=1,DriverSetup=Model:4070; BoardType:PCI”.

I tried using 6 channels (scan list ch0:5->com0). But when I ran this VI, I am not so sure what the chart shows me. The other question is: can I build an array from the measurement showing reading from these 6 channels?

I also try to use NI-DMM Express VI but when the property dialogue box open, there is only “configuration” tab found. I didn’t find “timing” and “switching” tab. I have upgraded to NI-SWITCH 2.5 and NI-DAQmx 8.0, but I didn’t get any difference. What can probably go wrong with this?

Thank you.

[AllanS]

Hello Soralee!

First, for connection information between the 1127 and the DMM please open up the Switch help from Start>>Program Files>>National Instruments>>NI-SWITCH>>Documentation>>NI-SWITCH Help.  Next click on the 'Favorites' tab on the bottom of that tab you will see a current topic text box.  Paste the below link in this text box and clikc the 'Add' button.

synchronousg_multiple.html#uipstl

This will give you my favorite page on how to connect a switch to a DMM I hope it is helpful.

Next, as far as seeing the Switch tab in the NI-DMM express VI did you upgrade your NI DMM driver to 2.5?  Let me know and have a great day!

Allan S.
National Instruments