Status of Digiatal output lines

[DanNatCorning]

Yemi, I tried to save the vi back to v7.0, but there are functiuons taht are not compatible, apparently.  I get error messages saying it can't be saved.  I'm looking around for help on this.  Nay one else have a solution?

[Laura F.]

Hello Yemi,

Since you are just getting started with your digital output application, I would recommend going to the Example Finder in LabVIEW (Help >> Find Examples) to find a VI to try out.  Are you using NI-DAQmx or Traditional NI-DAQ?  If your device supports it, which you can check at http://www.ni.com/support/daq/versions.htm then you should use NI-DAQmx.  In particular, a good example to look at in the Example Finder is Write Dig Chan found at Hardware Input and Output >> NI-DAQmx >> Digital Generation.  In order to use lines 0 through 5, you need to edit the channel parameters to say DevX/port0/line0:5 where X corresponds to your device number.  Then, you need to remove two active elements from the Data to Write array by right clicking on the array twice and selecting Data Operations >> Delete Element. 

Hope this helps,

Laura

[yemi]

Hi Laura,

Your suggestion has put me in the right direction, however on following your instruction and that in the example, i got the following error which i dont know how to fix. find below the error:

Possible reason(s):

Specified read or write operation failed, because the number of lines in the data for a channel does not match the number of lines in the channel.

If you are using the Digital Waveform datatype, make sure the number of lines in the digital waveform matches the number of lines in the channel. If you are using boolean data, make sure the array dimension for lines in the data matches the number of lines in the channel.

Number of Lines in Channel: 6
Number of Lines in Data: 1

Many Thanks

Yemi

[Laura F.]

Hi Yemi,

I have modified the example I referenced previously and attached it.  I tested it, and it works correctly.

Regards,

Laura

[Little_Tee]

Hello all,

Is it also possible to monitor the status of the Digital Counter Output? Or when a trigger is found?
Quick explanation of my situation - working in LabView 8 :
I'm sending a train of pulses with the Counter Output function each time a digital trigger is found. I just want a small led flashing on the screen each time this happens.

Thanks in advance!

[Hani R]

Hi Little_Tee,

There is no property in DAQmx that will tell you whether or not the counter has received a trigger. You can determine if a trigger is sent/received by physically connecting the trigger to a DIO-Line.  The led on the front panel can turn on when the line is high and off when it is low.



Message Edited by Hani R on 02-21-2008 10:08 PM