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. |
|
