DAQ assistant not detecting hardware

[sandeepchinni]

Hi,

I am using a PCI 1426 frame grabber and trying to send a digital high signal over the 15pin port available on the frame grabber. But, when I use the DAQ assistant to setup the device, the assistant is saying that it has not found any suitable devices.

What do I do to solve this problem?

Thanks,

Sandeep

[Albert.Geven]

Image acquisition is not data acquisition so this is correct

Look into imaqvision

[sandeepchinni]

Hi Albert,

Thanks for the response. I was told on another message board that I could use the DAQ assitant to send a TTL signal thru the 15pin port (not the camera link port) on the PCI 1426, so I tried that.

So, do you mean to say that it is not possible?

Regards,

Sandeep

[Kristen_K.]

Hi Sandeep!

The DAQ Assistant uses the DAQmx driver to populate the list of available devices.  Since the 1426 is a framegrabber instead of a DAQ device, it will not show up in the DAQ Assistant.  The TTL signals are used for tirggering the camera, which is what i assume you are wanting to do.  You can find an example in the NI Example Finder (under the Help menu) of how to specify the trigger line.  First, limit your search in Example Finder by adding the 1429 to the list of Hardware (bottom left corner of Example Finder).  Then select the "limit results to hardware" box.  Go to Hardware Input and Output >>IMAQ>>Signal Input and Output.  You will see HL Tiggered Snap.vi.  On the front panel select External for the Trigger Type and the number of which trigger line you are using.  To see pin outs for the tigger lines, consult the 1426 User Manual  page 3-3.  I hope this helps!

Kristen H.

[sandeepchinni]

Hi Kristen,

I think I did not explain clearly what I was trying to do in my first post. What I am doing is capturing images at around 30frames per second from a cameralink camera connected to the 1426 card. My second requirement is that I get the GPS time stamps at the instance of these image capture. The GPS receiver that I have requires a 5V pulse to trigger the GPS information acquisition.

So what I was planning to do was, send a pulse through one of the 4 TTL I/O lines in the 15pin connector to an amplifier which would amplify and send the signal to the GPS receiver. I am not trying to trigger the image capture through the TTL lines, I have a LabVIEW program which does that.

So, is this possible? how?

Thanks,

Sandeep

[Kristen_K.]

Hi Sandeep!

You can send a TTL trigger pulse through the 15-pin DSUB connection.  On page 3-3 of the 1426 User Manual, it is stated that the 15-pin D-SUB connector connects to general purpose digital I/O.  If you can connect your GPS receiver this way and the GPS receiver can accept digital signals, then I would imagine you will be able to send a TTL signal to the GPS receiver okay.  However, you will not use a DAQ Assistant.  All configuration will be done through IMAQ.  I hope this clears things up!

Kristen H.

[sandeepchinni]

Hi Kristen,

I havent been able to find any examples regarding the TTL pulse generation through the 15pin DSUB connection. I also looked at the IMAQ toolkits, but could not identify which functions to use to generate the pulses.

Can you please let me know which IMAQ functions can be used to generate the TTL pulse or any example that I have missed in the available ones which perform similar functions?

Thanks,

Sandeep 

[Kristen_K.]

Hi Sandeep!

Take a look at the LL Trigger Drive.vi found in the NI Example Finder ( Hardware Input and Output >> IMAQ >> Signal Input and Output.  Set the Trigger Type  to External and the Trigger Number to which ever line you want to send the trigger on.  Trigger Drive refers to what will cause the trigger to begin sending the trigger.  I hope this helps!

Kristen H.

[sandeepchinni]

Thanks Kristen,

Will have a look at the example.

One other question, I dont have the external device to which I will be sending the pulses built yet. So, is there any way by which I can verify that the pulses are being generated on the required lines?

Regards,

Sandeep

[Albert.Geven]

Maybe an oscilloscope will do....