Appendix C
Common Questions
C-4
ni.com
2.
Set up acquisition timing so that the timing signal for A/D conversion
comes from PFI5, as follows:
•
If you are using NI-DAQ, call
Select_Signal(deviceNumber, ND_IN_SCAN_START,
ND_PFI_5, ND_HIGH_TO_LOW)
.
•
If you are using LabVIEW, invoke AI Clock Config.vi with clock
source code set to PFI pin, high to low, and clock source string set
to 5.
3.
Initiate AI data acquisition, which starts only when the AO waveform
generation starts.
4.
Initiate AO waveform generation.
Timing and Digital I/O
What types of triggering can be hardware-implemented on the
NI PCI-6110/6111?
Hardware digital and analog triggering are both supported on the
NI PCI-6110/6111.
What added functionality does the DAQ-STC make possible in
contrast to the Am9513?
The DAQ-STC incorporates much more than just 10 Am9513-style
counters within one chip. In fact, the DAQ-STC has the complexity of more
than 24 chips. The DAQ-STC makes possible PFI lines, analog triggering,
selectable logic level, and frequency shift keying. The DAQ-STC also
makes buffered operations possible, such as direct up/down control, single
or pulse train generation, equivalent time sampling, buffered period, and
buffered semiperiod measurement.
What is the difference in timebases between the Am9513 counter/timer
and the DAQ-STC?
The DAQ-STC-based MIO devices have a 20 MHz timebase. The
Am9513-based MIO devices have a 1 MHz or 5 MHz timebase.
