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Chapter 2 Function Reference — Select_Signal
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National Instruments Corporation 2-375 NI-DAQ FRM for PC Compatibles
Legal values for source and sourceSpec depend on the signal and are shown in the following
tables.
signal =
ND_IN_START_TRIGGER
Use ND_IN_START_TRIGGER to initiate a data acquisition sequence. You can use an external
signal or output of general-purpose counter 0 as a source for this signal, or you can specify
that NI-DAQ generates it (corresponds to source =
ND_AUTOMATIC).
If you do not call this function with signal =
ND_IN_START_TRIGGER, NI-DAQ uses the
default values, source =
ND_AUTOMATIC and sourceSpec = ND_LOW_TO_HIGH.
If you call
DAQ_Config with startTrig = 1, NI-DAQ calls Select_Signal function with
signal =
ND_IN_START_TRIGGER, source = ND_PFI_0, and sourceSpec =
ND_HIGH_TO_LOW.
If you call
DAQ_Config with startTrig = 0, NI-DAQ calls Select_Signal function with
signal =
ND_IN_START_TRIGGER, source = ND_AUTOMATIC, and sourceSpec =
ND_DONT_CARE.
RTSI Bus
Signals
ND_RTSI_0 through ND_RTSI_6
Signal present at the RTSI bus
trigger line 0 through 7
ND_RTSI_CLOCK
Enable the device to drive the
RTSI clock line or prevent it from
doing it
ND_BOARD_CLOCK
Enable the device to receive the
clock signal from the RTSI clock
line or stop it from doing so
source sourceSpec
ND_PFI_0 through ND_PFI_9 ND_LOW_TO_HIGH and ND_HIGH_TO_LOW
ND_RTSI_0 through ND_RTSI_6 ND_LOW_TO_HIGH and ND_HIGH_TO_LOW
ND_GPCTR0_OUTPUT
ND_LOW_TO_HIGH and ND_HIGH_TO_LOW
ND_AUTOMATIC ND_DONT_CARE
ND_ATC_OUT ND_DONT_CARE
Table 2-35.
Possible Values for
signal
(Continued)
Group signal Description