ttl output signals

[gqstyle09]

sorry in advance for asking such a basic question, but i am new to labview and am still learning. i have a standard bnc-2120 board and was wondering what the best way to output a negative ttl trigger would be. ideally, the negative trigger is to stay at 5v, drawn down for short periods of time (around 1ms) whenever i send a command for it to do so. the signal is to be used to activate a shutter for a camera. thus far, all i've learned how to do in labview is program output waveforms and symmetric square waves. thanks in advance

[Jeremy_L]

Hi gg,

I'm assuming you have an E series DAQ card installed on your machine to communicate with your bnc board and you have LabVIEW 7.0. If you want to basically invert the behavior of your line, you can do this in Measurement and Automation Explorer (MAX). First, create a New DAQmx Task and set it up for a Digital I/O Line. Once the task is created, you can then click on it, and see it's task panel come up on the right side of MAX. Here, you can enable the Invert Line setting to behave as you would like. If you are using Traditional DAQ, then create a new Virtual Channel set for Digital I/O and invert the line.

Hope this helps!

Jeremy L.
National Instruments