Dalsa MotionVision CA-D6-0256W-ECEW, Руководство пользователя

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CA-D6-xxxxW User’s Manual
15
DALSA INC. 03-32-00225-06
Figure 6. Event-Triggered Image Capture
frame
transport
frame readout
EXSYNC
MODE
PRIN
exposure time
Trigger event
exposure wait state
Note that to have the camera react to an external event, your imaging system
must detect the event and then send the appropriate EXSYNC and PRIN signals
to the camera to cause it to capture images.
2.6 Data Bus
Digital Data
The CA-D6-xxxxW provides 4 channels of 8 bits of data in EIA-644 differential
format at 25 MHz.
To help clock digital data into framegrabbers, the camera outputs clocking
signals STROBE, LVAL, and FVAL.
STROBE
STROBE is a pixel clock signal for digital data. It is continuous, toggling even
when data is not valid. Digital data is valid on its rising edge with LVAL and
FVAL high.
LVAL
LVAL high with FVAL high indicates the camera is outputting a valid line of
pixels. Between valid lines within a frame, LVAL goes low for 29 inactive pixels
(0256 model) or 47 inactive pixels (0512 model).
FVAL
FVAL high indicates the camera is outputting a valid frame of data.
See section
2.3 for pinouts.
IMPORTANT:
This camera’s
data is valid on
the
rising edge
of STROBE,
unlike previous
DALSA
cameras, which
used the falling
edge.