DAQmxCreateCITwoEdgeSepChan

NI-DAQmx C Functions

DAQmxCreateCITwoEdgeSepChan

DAQmxCreateCITwoEdgeSepChan (TaskHandle taskHandle, const char counter[], const char nameToAssignToChannel[], float64 minVal, float64 maxVal, int32 units, int32 firstEdge, int32 secondEdge, const char customScaleName[]);

Purpose

Creates a channel that measures the amount of time between the rising or falling edge of one digital signal and the rising or falling edge of another digital signal. You can create only one counter input channel at a time with this function because a task can include only one counter input channel. To read from multiple counters simultaneously, use a separate task for each counter. Connect the input signals to the default input terminals of the counter unless you select different input terminals.

Parameters

Input
Name Type Description
taskHandle TaskHandle The task to which to add the channels that this function creates.
counter const char [] The name of the counter to use to create virtual channels.
nameToAssignToChannel const char [] The name to assign to the created virtual channel. If you specify your own names for nameToAssignToChannel, you must use the names when you refer to these channels in other NI-DAQmx functions.
If you create multiple virtual channels with one call to this function, you can specify a list of names separated by commas. If you provide fewer names than the number of virtual channels you create, NI-DAQmx automatically assigns names to the virtual channels.
minVal float64 The minimum value, in units, that you expect to measure.
maxVal float64 The maximum value, in units, that you expect to measure.
units int32 The units to use to return the measurement.
Value Description
DAQmx_Val_Seconds seconds
DAQmx_Val_Ticks Timebase ticks
DAQmx_Val_FromCustomScale Units a custom scale specifies. Use customScaleName to specify a custom scale.
firstEdge int32 Specifies on which edge of the first signal to start each measurement.
Name Description
DAQmx_Val_Rising Start each measurement on the rising edge of the first signal.
DAQmx_Val_Falling Start each measurement on the falling edge of the first signal.
secondEdge int32 Specifies on which edge of the first signal to stop each measurement.
Name Description
DAQmx_Val_Rising Stop each measurement on the rising edge of the second signal.
DAQmx_Val_Falling Stop each measurement on the falling edge of the second signal.
customScaleName const char [] The name of a custom scale to apply to the channel. To use this parameter, you must set units to DAQmx_Val_FromCustomScale. If you do not set units to DAQmx_Val_FromCustomScale, you must set customScaleName to NULL.

Return Value

Name Type Description
status int32 The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error.