Triggering; Triggering With A Digital Source - National Instruments 6711 User Manual

Triggering

A trigger is a signal that causes a device to perform an action, such as starting an acquisition.
You can program your DAQ device to generate triggers on:
• a software command
• a condition on an external digital signal
You can also program your DAQ device to perform an action in response to a trigger. The action
can affect:
• analog output generation
• counter behavior
For more information, refer to the
Output, and the Counter Triggering

Triggering with a Digital Source

Your DAQ device can generate a trigger on a digital signal. You must specify a source and an
edge. The digital source can be any of the PFI or RTSI <0..6> signals.
The edge can be either the rising edge or falling edge of the digital signal. A rising edge is a
transition from a low logic level to a high logic level. A falling edge is a high to low transition.
Figure 10-1 shows a 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:
• analog output generation
• counter behavior
For more information, refer to the
Output, and the Counter Triggering
Analog Output Triggering
section of Chapter 5, Counters.
Figure 10-1. Falling-Edge Trigger
5 V
Digital Trigger
Falling Edge Initiates Acquisition
Analog Output Triggering
section of Chapter 5, Counters.
10
section of Chapter 3,
0 V
section of Chapter 3,
© National Instruments | 10-1
Analog
Analog