CIChannelCollection.CreateCountEdgesChannel Method

public CIChannel CreateCountEdgesChannel(
	string counter,
	string nameToAssignChannel,
	CICountEdgesActiveEdge edge,
	long initialCount,
	CICountEdgesCountDirection countDirection
)

Public Function CreateCountEdgesChannel ( 
	counter As String,
	nameToAssignChannel As String,
	edge As CICountEdgesActiveEdge,
	initialCount As Long,
	countDirection As CICountEdgesCountDirection
) As CIChannel

Parameters

counter

Type: SystemString
The names of the counters to use to create the virtual channel.

nameToAssignChannel

Type: SystemString
The name to assign to the created channel. To use the physical channel name as the local virtual channel name, set this value to Empty.

edge

Type: NationalInstruments.DAQmxCICountEdgesActiveEdge
The edge of the source signal to increment or decrement the count.

initialCount

Type: SystemInt64
The value from which to start counting.

countDirection

Type: NationalInstruments.DAQmxCICountEdgesCountDirection
The direction in which to change the count on each edge.

Return Value

With the exception of devices that support multi-counter tasks, you can create only one CIChannel at a time with this function because a task can contain only one CIChannel. To read from multiple counters simultaneously, use a separate task for each counter.

This method creates a virtual channel for the physical channel name you specify.

If you do not provide a value for nameToAssignChannel, NI-DAQmx uses the physicalChannelName as the local virtual channel name. If you use nameToAssignChannel to create a name for the local virtual channel, you must use this name in other properties and methods.

The NI-DAQmx driver does not determine if the requested settings are possible until the task is verified. CreateCountEdgesChannel(String, String, CICountEdgesActiveEdge, Int64, CICountEdgesCountDirection) does not throw an exception for parameter values that are not compatible with your hardware or other settings in your task. To determine if all of the settings for a Task are valid, you must verify the task by starting the task, either with Start or by reading from or writing to the task, or by calling Control(TaskAction) with Verify.

Reference