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How Many Counters Does Each Type of Counter Input or Output Task Take?

Primary Software: Driver Software>>NI-DAQmx
Primary Software Version: 7.0
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem:
I am trying to use a DAQmx Create Channel VI for a counter, but I don't know how counters I need.

Solution:
The following table shows how many counters are required for each of the following tasks.  For some measurements, the number of counters depends on another setting.  In these cases all the possible settings that affect the number of counters have also been included.

Counter Input:

Counter Measurement	Polymorphic Instance	Number of Counters
CI Freq:  Low Frequeny with 1 Counter		1
CI Freq:  High Frequency 2 Counters		2
CI Freq:  High Frequnecy with 2 Counters		2
CI Period:  Low Frequency with 1 Counter		1
CI Period:  High Frequency with 2 Counters		2
CI Period:  Large Range with 2 Counters		2
CI Cnt Edges		1
CI Pulse Width		1
CI Semi Period		1
CI Angular Encoder		1
CI Linear Encoder		1
CI Two Edge Separation		1
CI GPS Timesamp		1

Counter Output:
There are three different counter pulse output task types, CO Pulse Freq, CO Pulse Time, CO Pulse Ticks, but they all take the same number of counters based on how many pulses you are generating--this is set on the DAQmx Timing VI. Finite pulse generation requires two counters because one counter gates the other to produce the finite pulse train.

Related Links:
Developer Zone Tutorial: Measurement Fundamentals Main Page
Developer Zone Tutorial: Complete Industrial Digital I/O and Counter/Timer Tutorial

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Report Date: 05/01/2008
Last Updated: 05/02/2008
Document ID: 4L0A62E9

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