Measurement Computing WavePort rev.3.0 - Manual (Page 68)

6-16 WaveView 09-29-00 WavePort User’s Manual
Digital-Pattern Trigger
In addition to digital trigger, the WavePort series supports a digital-pattern trigger (not available in the
WaveBook/512). This expanded capability allows data collection to start when a user-defined 16-bit digital
pattern is matched on the digital I/O connector. This feature is useful when trying to capture noise,
vibrations or some other physical disturbance that occurs at a particular point in a digitally-sequenced
process (from a PLC or relay-logic-control system).
When “Digital Pattern” is selected as the Triggering Type, the 16-bit pattern extension appears (as indicated
in the following figure). The Condition box allows the following choices:
Equal To (=) / Not Equal To (< >) – These options treat each digital line as a separate input to be
compared to logical 1 or 0. Selecting “Equal To” triggers only on the exact pattern of 1’s and 0’s selected.,
while “Not Equal” triggers on all others. You can also set any of the inputs to “don’t care” (X), which
excludes it from the comparison.
Greater Than (>) / Less Than (<) – These options interpret the digital inputs as a single 16-bit value and
allow a threshold trigger.
Acquisition Configuration Dialog Box, with Digital Pattern Extensions
Note: The top row contains a button labeled “External” for enabling the External Clock.