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Chapter 2 Function Reference — GPCTR_Watch
©
National Instruments Corporation 2-245 NI-DAQ FRM for PC Compatibles
GPCTR_Watch
Format
status = GPCTR_Watch (deviceNumber, gpctrNum, entityID, entityValue)
Purpose
Monitors state of the general-purpose counter and its operation.
Parameters
Input
Output
Parameter Discussion
Legal ranges for the gpctrNum, entityID, and entityValue are in terms of constants defined
in a header file. The header file you should use depends on which of the following languages
you are using:
• C programmers—
NIDAQCNS.H (DATAACQ.H for LabWindows/CVI)
• BASIC programmers—
NIDAQCNS.INC. Visual Basic for Windows programmers
should refer to the Programming Language Considerations section in Chapter 1, Using
the NI-DAQ Functions, for more information.
• Pascal programmers—
NIDAQCNS.PAS
gpctrNum indicates which counter to program. The legal values for this parameter shown in
Table 2-20.
entityID indicates which feature you are interested in. Legal values are listed in the following
paragraphs, along with the corresponding values you can expect for entityValue.
entityValue will be given either in terms of constants from the header file, or as numbers, as
appropriate.
Name Type Description
deviceNumber i16 assigned by configuration utility
gpctrNum u32 number of the counter to use
entityID u32 identification of the feature to monitor
Name Type Description
entityValue u32 the value of the feature specified by entityID