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Trigger voltage levels

General questions and apologies if the information is out there. I understand that when I specify a "rising edge" trigger, the task will trigger once a positive slope of voltage is detected. I am still unsure on how big that slope needs to be. I also wonder what voltage level Labview considers to be "high" and "low." In essence, I am wondering if specific numbers for rising edge slope and high and low voltage states are noted anywhere in the documentation or elsewhere. Would appreciate any insight people can provide.

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It depends, many of the DAQs have fixed thresholds for the rising/falling edges, typically the common TTL/CMOS levels.


What card are you talking about?

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I was wondering specifically about the NI-9775 and NI-9401 modules connected to a cDAQ-9189.

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