Matrix Vision mvBlueLYNX-X, Техническое руководство, Страница: 209 / 236

if - because of the nature of the trigger signal source - multiple trigger edges are generated within a
very short period of time even if there has just been a single trigger event. •
The latter one is also called bouncing.
Bouncing is the tendency of any two metal contacts in an electronic device to generate multiple signals as the
contacts close or open; now debouncing is any kind of hardware device or software that ensures that only a
single signal will be acted upon for a single opening or closing of a contact.
To address problems that can arise from these kinds of trigger signals MATRIX VISION offers debouncing
filters at the digital inputs of a device.
The debouncing filters can be found under Setting -> Base -> Camera -> GenICam -> Digital I/O Control ->
LineSelector (red box) for each digital input:
Figure 158: wxPropView - Configuring Digital Input Debounce Times
Each digital input (LineMode equals Input) that can be selected via the LineSelector property will offer its
own property to configure the debouncing time for falling edge trigger signals
(mvLineDebounceTimeFallingEdge) and rising edge (mvLineDebounceTimeRisingEdge) trigger signals.
The line debounce time can be configured in micro-seconds with a maximum value of up to 5000
micro-seconds. Internally each time an edge is detected at the corresponding digital input a timer will start
(orange * in figure 159 and 160), that is reset whenever the signal applied to the input falls below the
threshold again. Only if the signal stays at a constant level for a full period of the defined
mvLineDebounceTime the input signal will be considered as a valid trigger signal.
Of course this mechanism delays the image acquisition by the debounce time.
mvBlueLYNX-X Technical Manual
MATRIX VISION GmbH 22 April 2016 Version - 1.49 199