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Chapter 2 Function Reference — GPCTR_Watch
NI-DAQ FRM for PC Compatibles 2-246
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National Instruments Corporation
entityID = ND_COUNT
This is the counter contents. entityValue can be between 0 and 2
24
– 1 for E Series and 445X
and between 0 and 2
32
– 1 for 6602 and 455X devices.
entityID =
ND_COUNT_AVAILABLE
If the application is ND_TRIG_PULSE_WIDTH_MSR, ND_SINGLE_PULSE_WIDTH_MSR, or
ND_SINGLE_PERIOD_MSR, this entityID allows you to see whether your measurement has
completed.
Corresponding entityValue indicates the following:
ND_YES—the measurement has
completed;
ND_NO—the measurement has not completed.
entityID =
ND_AVAILABLE_POINTS
If the application is buffered event counting or time measurement, this entityID allows you
to see how many points have been transferred to the buffer.
entityID =
ND_ARMED
Indicates whether the counter is armed. entityValue can be ND_YES or ND_NO. You can use
this in applications such as
ND_SINGLE_PULSE_WIDTH_MSR for finding out when the pulse
width measurement completes.
entityID =
ND_TC_REACHED
Indicates whether the counter has reached terminal count entityValue can be ND_YES or
ND_NO. You can use this in applications such as ND_SINGLE_PULSE_WIDTH_MSR for
detecting overflow (pulse was too long to be measured using the selected timebase).
entityID =
ND_DONE
When the application is ND_SINGLE_TRIG_PULSE_GNR, this indicates that the pulse has
completed. entityValue can be
ND_YES or ND_NO. When the application is
ND_RETRIG_PULSE_GNR, this indicates that an individual pulse has completed. In this case,
the indication that an individual pulse has completed will be returned only once per pulse by
the
GPCTR_Watch function.
entityID =
ND_OUTPUT_STATE
You can use this to read the value of the counter output; the range is ND_LOW and ND_HIGH.
entityID =
ND_READ_MARK (6602 and 455X devices only)
Indicates the read mark in the buffer when a double-buffer operation is in progress.
entityValue can be between 0 and 2
32
– 1.
entityID =
ND_WRITE_MARK (6602 and 455X devices only)
Indicates the location in the buffer (specified in
GPCTR_Config_Buffer) in which the latest
input data has been written. entityValue can be between 0 and 2
32
– 1.
entityID =
ND_INTERNAL_MAX_TIMEBASE (6602 and 455X devices only)
Indicates the maximum frequency of the timebase available for a counter. The entityValue is
in Hertz.