TriggerCondition (Data Acquisition Toolbox)

TriggerCondition specifies the condition which must be satisfied before a trigger is issued. The available trigger conditions depend on the value of TriggerType.

If TriggerType is Immediate or Manual, the only available TriggerCondition is None. If TriggerType is Software, then TriggerCondition can be Rising, Falling, Leaving, or Entering. These trigger conditions require a value to be specified for TriggerConditionValue. Depending on the hardware you are using, additional trigger conditions may be available.

Characteristics


Device Objects	AI
Class	Common
Access	Read/write
Data Type	Enumerated list
Modify while Running	No

Values

The trigger condition given below can be used when TriggerType is Immediate or Manual or HwDigital (National Instruments only).


`{None}`	No trigger condition is required.

The trigger conditions given below can be used when TriggerType is Software.


Rising	The trigger occurs when the signal has a positive slope when passing through the specified value.
Falling	The trigger occurs when the signal has a negative slope when passing through the specified value.
Leaving	The trigger occurs when the signal leaves the specified range of values.
Entering	The trigger occurs when the signal enters the specified range of values.

National Instruments Values

The trigger condition given below can be used when TriggerType is HwDigital.


`{None}`	No trigger condition is required.

The trigger conditions given below can be used when TriggerType is HwAnalogChannel or HwAnalogPin.


{AboveHighLevel}	The trigger occurs when the signal is above the specified value.
BelowLowLevel	The trigger occurs when the signal is below the specified value.
InsideRegion	The trigger occurs when the signal is inside the specified region.
LowHysteresis	The trigger occurs when the signal is less than the specified low value with hysteresis given by the specified high value.
HighHysteresis	The trigger occurs when the signal is greater than the specified high value with hysteresis given by the specified low value.