how to generate a continuous ttl signal with a USB 6501

[minni]

Hello everybody,

I'm a beginner with LabView, so maybe my problem is very easy to fix.

I need to generate a digital output using a USB-6501. This TTL signal will then be used as switch for a device. Basically I need the digital output to be continuously at high TTL level until a user activated start is given. Then the digital output must stay at low TTL level until another user activated stop is given.

Does somebody have any suggestion of how to do this? I haven't managed so far to get anything different from a TTL high level from my usb 6501.

Many thanks.

[alcava.cr · Accepted solution]

Hi there, take a look at the VI I'm attaching. You can find more information about the device in the manuals and on this forum. I hope this helps

[apok]

the DO of your DAQ is an "open collector", tie a pullup 4.7Kohm to the DO and connect the other end of it to the 5Vdc output of the DAQ. in your vi, supply a lo(F) to it and you will see a lo ttl ouput, supply a hi(T) and it will pull up to the 5Vdc output.

[minni]

Many thanks. That helped a lot.

[1234568]

The example given is for Labview 9.0 ad above.  Do you have the example for labview 8.5?

[alcava.cr]

There you go!

[Chase.E]

Here is how you would have it output continuously a 1 second TTL on a device like a 6508.