I2773-4.4 en
145
Somat eDAQ
lite
7.3 Triggering Computed Channels
Trigger computed channels generate a logical channel data stream useful for
triggering DataModes or other computed channels.
7.3.1 Interactive Trigger
The Interactive Trigger channel provides a means to trigger DataModes and computed
channels directly from TCE. Up to eight Interactive Triggers are supported. For more
information on interactive triggering, see “Using Interactive Triggers” on page 71.
Input Channel
The input channel sets the sample rate of the channel. All data types are supported.
Output Data Type
The output channel data type is 8-bit unsigned (logical).
Trigger Index
Set the trigger index from 1 to 8.
Invert Trigger
Select the invert trigger option to reverse the logic of the trigger.
7.3.2 Trigger Generator
The Trigger Generator channel generates a trigger channel that consists of an optional
initial delay period followed by a repetitive cycle of on (TRUE) periods and off (FALSE)
periods. The eDAQ
lite
ensures that there is at least one output sample for both the
on period and the off period.
Use a Trigger Generator channel to create an elapsed time trigger for DataModes or
other computed channels that support triggering. For example, the eDAQ
lite
can use
a generated trigger channel to store 10 minutes of data every hour. The Trigger
Generator channel is ideally suited for long-term acquisitions such as temperature
measurements of civil structures.
NOTE
The upper limit for all periods in seconds is 4.25E+09 divided by the sample rate.
Input Channel
The input channel sets the sample rate of the channel. All data types are supported.
Output Data Type
The output channel data type is 8-bit unsigned (logical).
Initial Delay Period
Specify the initial delay period in seconds. After the delay period, the output switches
to the on state. If set to zero, the output starts in the on state.
On Period
Specify the on period in seconds. The output switches to the off state after this period.
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