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Caution
length of the I/O cable must be no longer than 3 m (10 ft). For all other products, the
length of the I/O cable must be no longer than 30 m (100 ft).
DAQ Hardware
DAQ hardware digitizes signals, performs D/A conversions to generate analog output signals,
and measures and controls digital I/O signals. Figure 1-2 shows the components common to all
AO Series devices. The following sections contain more information about specific components
of the DAQ hardware.
Analog Output
Digital I/O
Counters
DAQ-STC
Analog output devices use the National Instruments DAQ system timing controller (DAQ-STC)
for time-related functions. The DAQ-STC consists of the following three timing groups:
•
AI—two 24-bit, two 16-bit counters (not used on AO Series devices)
•
AO—three 24-bit, one 16-bit counter
•
General-purpose counter/timer functions—two 24-bit counters
You can independently configure the groups for timing resolutions of 50 ns or 10 µs. With the
DAQ-STC, you can interconnect a wide variety of internal timing signals to other internal
blocks. The interconnection scheme is flexible and completely software-configurable.
The DAQ-STC offers PFI lines to import external timing and trigger signals or to export
internally generated clocks and triggers. The DAQ-STC also supports buffered operations, such
as buffered waveform acquisition, buffered waveform generation, and buffered period
measurement. It also supports numerous non-buffered operations, such as single pulse or pulse
train generation, digital input, and digital output.
To ensure the specified EMC performance of the DAQCard-6715, the
Figure 1-2. Analog Output Block Diagram
PFI
Digital
Routing
RTSI
Analog Output Series User Manual
Bus
Interface
© National Instruments | 1-3
Bus
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