National Instruments Network Device DAQ S - Manual (Page 134)

Chapter 11 Triggering
NI 6124/6154 User Manual 11-2 ni.com
Figure 11-1 shows a falling-edge trigger.
Figure 11-1. Falling-Edge Trigger
You can also program your DAQ device to perform an action in response to
a trigger from a digital source. The action can affect the following:
• analog input acquisitions
• analog output generation
• counter behavior
Triggering with an Analog Source
(NI 6124 Only) Some S Series devices can generate a trigger on an analog
signal. Figure 11-2 shows the analog trigger circuitry.
Figure 11-2. Analog Trigger Circuitry
You must specify a source and an analog trigger type. The source can be
any analog input channel.
5 V
0 V
Falling edge initiates acquisition
Digital Trigger
Analog
Trigger
Detection
Mux
ADC
ADC
Analog Comparison Event
(Analog Trigger Circuitry Output)
AO Circuitry
AI Circuitry
Counter Circuitry ADC
ADC
PGIA AI 0
+
–
PGIA AI 1
+
–
PGIA AI 2
+
–
PGIA AI 3
+
–