Digital input devices have interrupts and triggers to detect changes in the digital input signal, and the available functions vary depending on the device.
Basically, interrupts are faster and more reliable, but the trigger is excellent in terms of functionality, such as being able to be set in both directions.
In DAQ-DNC, when edge detection is set, the interrupt or trigger function is used with the following priority.
1. Uses interrupts if interrupts are available
2. Uses triggers if triggers are available
3. If neither is available, no settings are made and "invalid parameter" is returned during Init.
When using the trigger function, be aware that signal changes that occur in a short time (around 100 msec or less is a guide) may be missed.