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Chapter 2 Function Reference — Select_Signal
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National Instruments Corporation 2-383 NI-DAQ FRM for PC Compatibles
Note Disabling the output on the PFI7 line (by calling Select_Signal with
signal =
ND_PFI_7 and source = ND_NONE) and then calling
Select_Signal
with signal =
ND_RTSI_i and source =
ND_IN_SCAN_START will result in ND_IN_SCAN_START being driven on the
specified RTSI line regardless of what source was used to drive the PFI7 line
in any previous
Select_Signal call.
• Configuring some external devices, such as the SC-2040, will cause the
ND_IN_SCAN_IN_PROG signal to be output on the PFI7 line. This will cause an ensuing
call to
Select_Signal with signal = ND_RTSI_i and source = ND_IN_SCAN_START
to drive
ND_IN_SCAN_IN_PROG onto the specified RTSI line.
You can use the
GPCTR0_OUTPUT
pin on the I/O connector in two ways—as an output pin
or an input pin. When you configure the pin as an output pin, you can program the pin to
output a signal from a RTSI line or the general-purpose counter 0 output (see signal =
ND_GPCTR0_OUTPUT
in this function for details). When you configure the pin as an input
pin, you can attach an external signal to the pin. When signal is one of the RTSI lines, and
source =
ND_GPCTR0_OUTPUT
, the signal on the RTSI line will be the signal present at the
GPCTR0_OUTPUT
pin on the I/O connector, which is not always the output of the
general-purpose counter 0.
The following table applies to DAQArb 5411 devices only.
Use
ND_NONE
to diable the output on the RTSI line.
The
MARKER
output and the
SYNC
output, which are generated during the waveform
generation, can be routed to any of the RTSI trigger lines. For more details on the
MARKERs
and
SYNC
output, refer to your DAQArb 5411 User Manual. You also can route the start
trigger signal to any of the RTSI trigger lines. This action might be useful to trigger multiple
devices with the same signal at one time.
signal =
ND_RTSI_CLOCK
source sourceSpec
ND_MARKER ND_DONT_CARE
ND_SYNC_OUT ND_DONT_CARE
ND_OUT_START_TRIGGER ND_DONT_CARE
ND_NONE ND_DONT_CARE
source sourceSpec
ND_NONE ND_DONT_CARE
ND_BOARD_CLOCK ND_DONT_CARE