National Instruments cRIO-904 Series User Manual

Signals with an * support digital filtering. Refer to the PFI Filters section for more
information.
DO Sample Clock Signal
The DO Sample Clock signals when all the digital output channels in the task update. DO
Sample Clock can be generated from external or internal sources as shown in the image below.
Figure 42. Digital Output Timing Options
Programmable
Clock
Divider
DO Sample Clock
Timebase
PFI
Analog Comparison Event
Ctr n Internal Output
DO Sample
Clock
Analog Comparison
Event
80 MHz Timebase
20 MHz Timebase
PFI
13.1072 MHz Timebase
12.8 MHz Timebase
10 MHz Timebase
100 kHz Timebase
Routing DO Sample Clock to an Output Terminal
You can route DO Sample Clock to any output PFI terminal. DO Sample Clock is active high
by default.
DO Sample Clock Timebase Signal
The DO Sample Clock Timebase signal is divided down to provide a source for DO Sample
Clock. DO Sample Clock Timebase can be generated from external or internal sources and is
not available as an output from the controller.
DO Start Trigger Signal
Use the DO Start Trigger signal to initiate a waveform generation. If you do not use triggers,
you can begin a generation with a software command. If you are using an internal sample
clock, you can specify a delay from the start trigger to the first sample. For more information,
refer to the NI-DAQmx Help.
Using a Time Source
To use the Start Trigger signal with a time source, configure a specific time in NI-DAQmx.
Refer to the "Timestamps" and "Time Triggering" topics in the NI-DAQmx Help for more
information on accessing time-based features in the NI-DAQmx API.
cRIO-904x User Manual | © National Instruments | 69

National Instruments cRIO-904 Series Specifications

General

Brand	National Instruments
Model	cRIO-904 Series
Category	Controller
Language	English