Chapter 2 Function Reference — Select_Signal
NI-DAQ FRM for PC Compatibles 2-382
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National Instruments Corporation
I/O connector because the pin is used for device-to-SCXI communication. Currently, there are
no SCXI modules that require this.
signal = ND_FREQ_OUT
Use ND_NONE to disable the output on the pin; in other words, to place the pin in high
impedance state.
The signal present on the FREQ_OUT pin of the I/O connector is the divided-down v ersi o n o f
one of the two internal timebases. Use sourceSpec to specify the divide-down factor.
signal = ND_RTSI_0 through ND_RTSI_6
Note This information applies to E Series devices only.
When source = ND_IN_SCAN_START, the actual signal source on the specified RTSI line
will be ND_IN_SCAN_START or ND_IN_SCAN_IN_PROG. The default signal source is
ND_IN_SCAN_START, with source = ND_IN_SCAN_START. The following actions will
change the signal source:
• Call the select_signal function with signal = ND_PFI_7 and
source=ND_IN_SCAN_START or ND_SCAN_IN_PROG.
source sourceSpec
ND_NONE ND_DONT_CARE
ND_INTERNAL_10_MHZ 1 through 16
ND_INTERNAL_100_KHZ 1 through 16
source sourceSpec
ND_NONE ND_DONT_CARE
ND_IN_START_TRIGGER ND_LOW_TO_HIGH
ND_IN_STOP_TRIGGER ND_LOW_TO_HIGH
ND_IN_CONVERT ND_HIGH_TO_LOW
ND_OUT_UPDATE ND_HIGH_TO_LOW
ND_OUT_START_TRIGGER ND_LOW_TO_HIGH
ND_GPCTR0_SOURCE ND_LOW_TO_HIGH
ND_GPCTR0_GATE ND_POSITIVE
ND_GPCTR0_OUTPUT ND_DONT_CARE
ND_IN_SCAN_START ND_LOW_TO_HIGH