Using Two DAQ, is it possible?

Hi you guys! First of all, my name is Carlos and i´m a student of Mechanical Engineering. At the time, we dispose (in our university) from several test banks that are in poor conditions, so I been told to repair one of them. In`s a Refrigeration Test Bank (I attached a photo), it´s out of any operation so I have to put it operative again at first, then I have to replace all the analog indicators you see at the photo and become them digital. I`ve been doing some research on the web and I found the NI-6008 (This DAQ has been used in several applications in the University), I saw it can be connected with the LABVIEW SignalExpress, and it´d would be easy (in a manner of speak) in my case because all I have to do is display and register the values (temperature and pressure) from the bank and the program allows me that.
The problem surges when I see that NI-USB 6008 has 8 Analog Inputs, and I need 10 AI, so I´d have to buy two of them (Because is the cheapest one and I don´t have too much money) and I would like to know if there is any problem about connecting both DAQ at the same time? Is it possible to connect them with the Labview SignalExpress?
I hope to get some replies so I can solve my problem. Thanks for your help
Best regards
Attachments:
IMG00394-20101110-0956.jpg ‏369 KB

You can certainly use two 6008s at once. And SignalExpress will handle them, as well. If you have no programming experience, SignalExpress can get you started. If you want specialized analysis or display, you can use SignalExpress to generate code to LabVIEW to get you started on an application. Note that this code will be the data acquisition and analysis part of your code. You will still need to write the GUI properly using event structures. If you do this, post on these forums for some tips to get you going in the right direction (e.g. use producer/consumer and state machine architectures).
This account is no longer active. Contact ShadesOfGray for current posts and information.

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Examples.zip ‏5 KB

Hello;
The best way to handle multiple applications acquiring data from the same DAQ device is to make both asynchronous. Once there is a synchronous acquisition, the execution pointer can get stuck inside one of the analog input read functions, and when the other application tries to get the control of the execution pointer, that message shows.
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[posted and mailed]
[email protected] (Joshua Marshall) wrote in
<[email protected]>:
>Can anyone tell me the easiest way to do analog input data acquisition
>(in LabVIEW) using two PCMCIA (DAQCard-AI-16E-4) cards? There is no
>RTSI bus connection between the cards... as would typically be used to
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>
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Q: Re: Q: Acquiring data using two E series devices connected by RTSI and streaming data to disk

<< (My first posting)
I use two E series PCI Cards, connected by RTSI. I'd like to stream the data
from both cards to a binary file and to add a header to it.
I also need to somehow read (plot) the stored data, this with another VI.
The whole should be then integrated into an existing program, that used just
one acquisition card.
Till now I have tried to combine "Two E-series Shared ScanClk.vi" and "High
Speed Data Logger.vi" into another VI, and I have tried to read the stored
data with the "High Speed Data Reader.vi". The problem is that I fight with
one error after another, what prevents me from going further.
I use LabView 6.1, under Windows 2K.
Has somebody by chance already done something similar and would agree to
share with me their experience? TIA for any suggestion.
Regards,
Victor Manta
>>
"Ben" wrote in message
news:[email protected]...
> Hi Victor,
>
> I have done a lot of similar work.
>
> Exactly what did you try and what specific errors did you encounter?
>
> What you are trying is do-able provided the hardware you have suuports
> it.
>
> Please post (both here and to the DAQ group)
> the details of the hardware you are using,
> versions of software being used,
> Examples that you are using,
> error codes that occured,
> posibly post example code showing the problem.
>
> Ben
Hi Ben,
I use two PCI-MIO-16E-1 cards, connected by RTSI. I'd like to stream the
data from both cards in real time to a binary file, after having added a
header to it.
For tests, on the channel 0 of each card is applied the same square wave,
100 Hz.
Yes, the hardware support RTSI. I use LabView 6.1.
Till now I have:
1. Combined the "Two E-series Shared ScanClk.vi" and the "High
Speed Data Logger.vi" into a DAQ VI. To do this, I have "doubled" and
adapted the "High Speed Data Logger.vi". For testing purposes the data are
stored in two files, always the same ones (the old ones being overwritten
after each acquisition).
2. "Doubled" and adapted "High Speed Data Reader.vi" into another VI, for
reading from both files, mentioned earlier.
What already works:
- The headers for both files are correctly stored (VI point 1.)
- The acquired data from the first card (device 1) are correctly stored (VI
point 1.)
- The VI (point 2.) that reads both files and displays the results works
What doesn't work:
- The acquired data from the second card aren't stored at all (VI point 1.)
- An error message says: "Error -10608 occurred at AI Buffer Read. Possible
reason: NI-DAQ LV: No transfer is in progress for the specified resource."
I think that I understand this message, but I don't know how to continue.
The DAQ VI can be downloaded from (please click the link, then the link on
that page; about 100K, zipped):
http://www.swissheartnet.unibe.ch/labview.htm
Thanks a lot in advance.
Regards,
Victor Manta
PS. I don't know which DAQ group you mean.

"Filipe A." wrote in message
news:[email protected]...
> Victor;
>
> You can definitely accomplish that task with the DAQ boards you have
> and Labview.
>
> It would be good if you could be more specific as far as what type of
> errors you are seeing and how you are integrating both VIs.
>
> Regards
> Filipe A.
> Applications Engineer
> National Instruments
Maybe Mr. Filipe A. could help me? Please see below, and TIA.
Regards,
Victor Manta
"Victor Manta" wrote in message
news:[email protected]...
> << (My first posting)
> I use two E series PCI Cards, connected by RTSI. I'd like to stream the
data
> from both cards to a binary file and to add a header to it.
>
> I also need to somehow read (plot) the stored data, this with another VI.
>
> The whole should be then integrated into an existing program, that used
just
> one acquisition card.
>
> Till now I have tried to combine "Two E-series Shared ScanClk.vi" and
"High
> Speed Data Logger.vi" into another VI, and I have tried to read the stored
> data with the "High Speed Data Reader.vi". The problem is that I fight
with
> one error after another, what prevents me from going further.
>
> I use LabView 6.1, under Windows 2K.
>
> Has somebody by chance already done something similar and would agree to
> share with me their experience? TIA for any suggestion.
>
> Regards,
> Victor Manta
> >>
>
> "Ben" wrote in message
> news:[email protected]...
> > Hi Victor,
> >
> > I have done a lot of similar work.
> >
> > Exactly what did you try and what specific errors did you encounter?
> >
> > What you are trying is do-able provided the hardware you have suuports
> > it.
> >
> > Please post (both here and to the DAQ group)
> > the details of the hardware you are using,
> > versions of software being used,
> > Examples that you are using,
> > error codes that occured,
> > posibly post example code showing the problem.
> >
> > Ben
>
> Hi Ben,
>
> I use two PCI-MIO-16E-1 cards, connected by RTSI. I'd like to stream the
> data from both cards in real time to a binary file, after having added a
> header to it.
>
> For tests, on the channel 0 of each card is applied the same square wave,
> 100 Hz.
>
> Yes, the hardware support RTSI. I use LabView 6.1.
>
> Till now I have:
>
> 1. Combined the "Two E-series Shared ScanClk.vi" and the "High
> Speed Data Logger.vi" into a DAQ VI. To do this, I have "doubled" and
> adapted the "High Speed Data Logger.vi". For testing purposes the data are
> stored in two files, always the same ones (the old ones being overwritten
> after each acquisition).
>
> 2. "Doubled" and adapted "High Speed Data Reader.vi" into another VI, for
> reading from both files, mentioned earlier.
>
> What already works:
>
> - The headers for both files are correctly stored (VI point 1.)
> - The acquired data from the first card (device 1) are correctly stored
(VI
> point 1.)
> - The VI (point 2.) that reads both files and displays the results works
>
> What doesn't work:
>
> - The acquired data from the second card aren't stored at all (VI point
1.)
> - An error message says: "Error -10608 occurred at AI Buffer Read.
Possible
> reason: NI-DAQ LV: No transfer is in progress for the specified resource."
>
> I think that I understand this message, but I don't know how to continue.
>
> The DAQ VI can be downloaded from (please click the link, then the link on
> that page; about 100K, zipped):
>
> http://www.swissheartnet.unibe.ch/labview.htm
>
> Thanks a lot in advance.
>
> Regards,
>
> Victor Manta
>
> PS. I don't know which DAQ group you mean.

Q: Acquiring data using two E series devices connected by RTSI and streaming data to disk

I use two E series PCI Cards, connected by RTSI. I'd like to stream the data
from both cards to a binary file and to add a header to it.
I also need to somehow read (plot) the stored data, this with another VI.
The whole should be then integrated into an existing program, that used just
one acquisition card.
Till now I have tried to combine "Two E-series Shared ScanClk.vi" and "High
Speed Data Logger.vi" into another VI, and I have tried to read the stored
data with the "High Speed Data Reader.vi". The problem is that I fight with
one error after another, what prevents me from going further.
I use LabView 6.1, under Windows 2K.
Has somebody by chance already done something simi
lar and would agree to
share with me their experience? TIA for any suggestion.
Regards,
Victor Manta

<< (My first posting)
I use two E series PCI Cards, connected by RTSI. I'd like to stream the data
from both cards to a binary file and to add a header to it.
I also need to somehow read (plot) the stored data, this with another VI.
The whole should be then integrated into an existing program, that used just
one acquisition card.
Till now I have tried to combine "Two E-series Shared ScanClk.vi" and "High
Speed Data Logger.vi" into another VI, and I have tried to read the stored
data with the "High Speed Data Reader.vi". The problem is that I fight with
one error after another, what prevents me from going further.
I use LabView 6.1, under Windows 2K.
Has somebody by chance already done something similar and would agree to
share with me their experience? TIA for any suggestion.
Regards,
Victor Manta
>>
"Ben" wrote in message
news:[email protected]...
> Hi Victor,
>
> I have done a lot of similar work.
>
> Exactly what did you try and what specific errors did you encounter?
>
> What you are trying is do-able provided the hardware you have suuports
> it.
>
> Please post (both here and to the DAQ group)
> the details of the hardware you are using,
> versions of software being used,
> Examples that you are using,
> error codes that occured,
> posibly post example code showing the problem.
>
> Ben
Hi Ben,
I use two PCI-MIO-16E-1 cards, connected by RTSI. I'd like to stream the
data from both cards in real time to a binary file, after having added a
header to it.
For tests, on the channel 0 of each card is applied the same square wave,
100 Hz.
Yes, the hardware support RTSI. I use LabView 6.1.
Till now I have:
1. Combined the "Two E-series Shared ScanClk.vi" and the "High
Speed Data Logger.vi" into a DAQ VI. To do this, I have "doubled" and
adapted the "High Speed Data Logger.vi". For testing purposes the data are
stored in two files, always the same ones (the old ones being overwritten
after each acquisition).
2. "Doubled" and adapted "High Speed Data Reader.vi" into another VI, for
reading from both files, mentioned earlier.
What already works:
- The headers for both files are correctly stored (VI point 1.)
- The acquired data from the first card (device 1) are correctly stored (VI
point 1.)
- The VI (point 2.) that reads both files and displays the results works
What doesn't work:
- The acquired data from the second card aren't stored at all (VI point 1.)
- An error message says: "Error -10608 occurred at AI Buffer Read. Possible
reason: NI-DAQ LV: No transfer is in progress for the specified resource."
I think that I understand this message, but I don't know how to continue.
The DAQ VI can be downloaded from (please click the link, then the link on
that page; about 100K, zipped):
http://www.swissheartnet.unibe.ch/labview.htm
Thanks a lot in advance.
Regards,
Victor Manta
PS. I don't know which DAQ group you mean.

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