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Chapter 2 Function Reference — Select_Signal
NI-DAQ FRM for PC Compatibles 2-372
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National Instruments Corporation
Select_Signal
Format
status = Select_Signal (deviceNumber, signal, source, sourceSpec)
Purpose
Chooses the source and polarity of a signal that the device uses (E Series and DAQArb 5411
devices only).
Parameters
Input
Parameter Discussion for the E Series, DAQArb 5411, and DSA Devices
Legal ranges for the signal, source, and sourceSpec parameters are given in terms of
constants that are 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
You can use the onboard DAQ-STC to select among many sources for various signals.
signal specifies the signal whose source you want to select. Table 2-35 shows the possible
values for signal.
Note
Only the following signals are supported for the DAQArb 5411 devices:
•
ND_OUT_START_TRIGGER
• ND_OUT_UPDATE
Name Type Description
deviceNumber i16 assigned by configuration utility
signal u32 signal to select the source and polarity
source u32 the source of the signal
sourceSpec u32 further signal specification (the polarity of the
signal)