12-20-2014 06:58 PM
12-22-2014 01:04 PM
Hi YellowDart,
The NI 9402 is LVTTL device with a minimum input high voltage of 2 V. Using a 2.2 V high is not a recommended setup because it is very close to the minimum high input. However, it should work for the most part. You also could construct a voltage divider as suggested in the other post instead.
http://forums.ni.com/t5/Digital-I-O/adjustable-digital-input-voltage/td-p/3068146
As for general DAQmx tricks, you can use property nodes to access and set device properties. The properties you can set are device dependent, and allow you to tweak your acquisition settings. The 9402 doesn’t have the Digital Input Logic Level Select property because it is defaults to LVTTLs.
Basics of NI-DAQmx Property Nodes