Comparing digital input and output from two different DAQs

I want to create this program where the digital output lights up LEDs at random and push buttons are the digital input part of another DAQ are pushed. When the correct button is pushed, the score will increase by 1. My code doesn't work though. Can someone point my errors to me? Both the DAQs i'm using are USB-6008 DAQs. thanks
Attachments:
Untitled 1.vi ‏41 KB

Let's start with the digital output
What is this code all about?
Do you want only one of the 8 led's to lit randomly or are multiple led's also ok?
The two possible codes are in attached file SNAG-003.jpg
Connect the output of the "Scale by power of 2" function or the "Multiply" output directly to the Write DAQmx vi
I don't understand the purpose of the "Boolean Value" and "Replace subset array" thing, so I skipped it
Attachments:
SNAG-002.jpg ‏49 KB
SNAG-003.jpg ‏22 KB

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How to synchronize analog input and output from two different USB daq boards

Hi all,
I have two very differnt USB boards the NI USB 6008, which I am using to acquire the data (Analog Input) and a NI USB 9263, it is an Analog Output only board that I am using to deliver a signal (in this case a square pulse). The reason why I am not using the 6008 Analog Ouputs is because I need to deliver negative voltages and need the full +/-10V range.
Looking at similar posts I am pretty sure that I can't use an external trigger or a shared clock, I also tried to use the synchronization of timed structures but no cigar.
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Attachments:
Test Pulse.vi ‏117 KB

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Simultaneous Digital Input and Output from NI 9403

Hi,
I was wondering if it is possible to digital output through one line in this module(NI 9403) while simultaneously reading from 10 other lines?
Basically what I need is for line0 to always be closed(true), and read lines1:10 - at very least 1sample/second.
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Attachments:
Digital I-O.vi ‏22 KB

Hi Matthew,
The behavior you're seeing is expected for the 9403 module, since it is a serial module. The DAQmx help has the following restrictions in the Digital I/O Considerations for C Series Devices section.
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So you can only do timed input or output at one time, but not both. However, based on the VI you attached and the description of what you want to do, you don't necessarily need both timed tasks in your loop. You can create a static output task to update that one line and after that, you can just start your timed input task on the rest of the lines. This should maintain the state on the DO line, since you're not acquiring from it.
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Can you perform simultaneous timed digital input and output using a PCI-6120?

Is it possible to do simultaneous timed digital input and output using a PCI-6120? It seems that timed digital operations require using the group read/write commands, which utilize an entire port. Since the PCI-6120 has only 1 digital I/O port, I would like to be able to use 2 lines as outputs and 1 line as input, and do both in a deterministic fashion. i.e. create a digital signal with known pulse widths and read an input line at a known time after the outputs were set. Is this possible to do with only one digital I/O port?

Hello,
This can be done in LabVIEW. There is actually an example that installs with NI-DAQ.
Below is a link to a Knowledge Base that explains how to find the correlated digital I/O examples.
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XiFi and Audigy Take Over Input and Output from Bluetooth Head

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thanks for reply..
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Producer consumer with analog and digital inputs and outputs

Hi everyone,
I am working on a control system program for some practical test work. Currently I am working on the data acuisition component of the Labview program. My architecture is produced-consumer loops with a que. My system will have analog inputs, analog outputs, digital inputs and digital outputs. It's not a time critical sytem, but I would like all of the data acquisition to be synchronised. I have attached my program as it is at the moment. I am having trouble getting all of the data into the que since I have two data types. Also, I'm not sure if i've synchronised the four read/write sequences correctly. I would greatly appreciate if somebody could take a look at my program and give me some advice. Thanks in advance.
Solved!
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Attachments:
control_v2_DAQ loop.vi ‏46 KB

Robert, the specific error that I get is:
Error -200462 occurred at DAQmx Start Task.vi:6
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Generation cannot be started because the output buffer is empty.
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Task Name: Heater testing lab digital outputs
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Attachments:
control_v2_ML_simple.vi ‏83 KB

How to switch USB-6008 between digital input and output modes

Hi I have been following the examples of setting a specific port to either inout or output using the DAQmxCreateDIChan() or DAQmxCreateDOChan() calls. What I now want to do, is switch betwen inout to output mode and back again.
DAQmxCreateDOChan()
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DAQmxReadDigitalU32()
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Hi RJM,
If you want to be able to switch your digital line between input and output, then you will need to use the Tristate Property. There is another discussion forum with more detailed information about using this property and I believe that you have already seen it. I am going to post the link in case anyone else wants to see the other forum as well: Tristate Property Discussion Forum. Reddog's post is very informative.
Regards,
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I attached a couple programs that might be of use. Check this post:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000000080000008BA10000&USEARCHCONTEXT_CATEGORY_0=_31_%24_12_&USEARCHCONTEXT_CATEGORY_S=0&UCATEGORY_0=_31_%24_1
2_&UCATEGORY_S=0
Hope that helps. Have a good day.
Ron

Patterned input and output from a single port w/ NI 6534 DIO

Is it possible to configure certain lines in a port to be read and others to be write? I am interested in doing patterned I/O with a single port, first output, then input. Not both at the same time. Is it possible to perform patterned output on one line and patterned input on a different line within the same port?
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Hi Scott,
I understand that you'd like to do digital I/O on a PCI-6534. All of the scenarios you outlined in your question should be possible with this board.
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Marcus G.
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Generally the way I have seen that sort of things designed is like this: You have a script in mind. For example:
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Input and output on same device, producer/consumer structure

Hello interested people,
I have a question about using the same device for both digital inputs
and outputs. I have written a simple program of one while loop
that continuously polls the device, processes, and requests. I
have addressed the device using two DAQmx Asst. and I have attached
them with their error in/out cluster terminals to provide data flow and
eliminate the chance of addressing the devices at the same time (which
produces an error). Now I want to change this program structure
to a producer/consumer loop foundation with state machine.
In this design, I will have the DI in the producer loop and the DO in
the consumer loop, under one of the states. I can't simply
connect the error in/out ports in this configuration, so my question is
how to avoid the error caused by addressing the same device
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have attached two VI's, the "One Loop" vi is the original configuration
(simplified), and the Producer-Consumer vi is a NONSENSICAL program
that simply represents the desired configuration. (I don't need
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Attachments:
One Loop DO DI.vi ‏102 KB
Producer-Consumer DI-DO.vi ‏106 KB

Hello,
It sounds to me like you really have two modes:
1. user interface actions determine execution
2. user interface is locked, and execution is automated.
I think it would make sense to use the producer consumer for an architecture. Basically you would do the following:
1. program the producer to handle the user interface as you normally would.
2. provide one additional event case in the producer which would be your "automated handling" case. In that case, you could put a state machine which could run until whatever conditions were met to put your program back in "user interface mode".
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Best,
JLS
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FINALLY INPUTTING and OUTPUTTING Annotations!

Ok, before everyone thinks that this is a very bad solution, I have to tell that I`m no programmer and my knowledge of PostgreSQL, Ruby or any other language is very poor.
With useful help from Jamie Hodge, fbm and Nicholas Stokes (mainly)
I could manage to write a command for inputting and outputting from Final Cut Server Annotations.
So lets go to the fun part:
INPUTTING:
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Listing multiple: 2
Wildcard include Filter: *.txt (or any custom extensions you want)
3 - Create a txt file and use this as a template:
{ASSET_ENTITYID}|1527|{TCIN}/(30000,1001)|{TCOUT}/(30000,1001)|{Annotation}|{USE RID}|{DATE}
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/Library/Application\ Support/Final\ Cut\ Server/Final\ Cut\ Server.bundle/Contents/Resources/sbin/fcsvr_run psql px pxdb -c "SELECT pxmdvalue.entityid, pxmdvalue.value AS asset_name FROM pxmdvalue INNER JOIN pxentity ON pxentity.entityid = pxmdvalue.entityid WHERE pxmdvalue.fieldid='1543' AND pxmdvalue.value='ASSETNAME' AND pxentity.address LIKE '/asset/%';"
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ASSETNAME | TCIN | TCOUT | ANNOTATIONS | USER
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The command-line is:
/Library/Application\ Support/Final\ Cut\ Server/Final\ Cut\ Server.bundle/Contents/Resources/sbin/fcsvr_run psql px pxdb -c "SELECT pxmdvalue.value AS Asset_NAME, pxtcmdvalue.value, pxtcmdvalue.begintc, pxtcmdvalue.endtc FROM pxmdvalue INNER JOIN pxtcmdvalue ON pxmdvalue.entityid = pxtcmdvalue.entityid WHERE pxmdvalue.value='ASSETNAME';"
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Or issuing the following to OUTPUT ANNOTATIONS from ALL assets:
/Library/Application\ Support/Final\ Cut\ Server/Final\ Cut\ Server.bundle/Contents/Resources/sbin/fcsvr_run psql px pxdb -c "select * from pxtcmdvalue;"
Adding "> /PATHTO_WHERE_IN_WANT/ANNOTATIONSOUTPUT.TXT" at the end will put all output into a txt file.
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(I`m having problem with this, it doesn`t work).
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In theory it`s possible to modify the FinalCutServerIntegrationSample get and input annotations instead of adding another "comment" field to md group list.
Few!
Ok so please help beautify this out!
This will be very useful for a lot of people.... We know that it`s only a matter of time to FCSVR have this function built-in... but this "time" could be years.
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Regards!

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jverd wrote:
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