Chapter 2
Hardware Overview
2-4
ni.com
Acquisition and Region-of-Interest Control
The acquisition and region-of-interest (ROI) control circuitry routes
the active pixels from the 10-bit ADC to the onboard memory. The NI 1410
can perform ROI and scaling on all video lines. Pixel and line scaling
transfers certain multiples (two, four, or eight) of pixels and lines to
onboard memory.
RTSI Bus
The seven trigger lines on the RTSI bus provide a flexible interconnection
scheme between multiple image acquisition devices, as well as between
National Instruments DAQ or Motion Control devices.
Digital Input/Output Circuitry
The digital input/output (I/O) circuitry routes, monitors, and drives the
external trigger lines, RTSI bus lines, and camera control lines. You can
use the trigger lines to start or stop an acquisition on a rising or falling edge.
You also can map onboard signals such as HSYNC, VSYNC,
ACQUISTION_IN_PROGRESS, and ACQUISITION_DONE to these
lines. The camera control lines provide a means to generate deterministic
signals for triggering cameras, strobe lights, or other timing-critical
applications.
Note
The NI 1410 does not support pixel clock output on the trigger lines.
Acquisition Modes
The NI 1410 supports the following four video acquisition modes:
•
Standard Mode
—In standard mode, the NI 1410 receives an
incoming composite video signal from the external BNC or 68-pin
VHDCI connector and generates CSYNC, HSYNC, VSYNC, and
PCLK signals. The VHDCI connector outputs the generated CSYNC
signal to synchronize other image acquisition devices or cameras.
•
CSYNC External Mode
—In CYSNC external mode, the NI 1410
receives an incoming video signal (composite or luminance) and an
external CSYNC signal from the external connector and generates
HSYNC, VSYNC, and PCLK signals.
•
External Lock Mode
—In external lock mode, the NI 1410 receives
HSYNC, VSYNC, and PCLK signals from the camera and uses these
signals to acquire the video signals directly. You can use this mode to
acquire from a line scan camera.
