Chapter 3
Hardware Overview
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National Instruments Corporation
3-9
Acquisition Modes
The 1408 device supports three video acquisition modes:
•
Standard mode—In standard mode, the 1408 device receives an
incoming composite video signal from the external BNC or DSUB
connector and generates CSYNC, HSYNC, VSYNC, and PCLK
signals. The generated CSYNC signal is output on the DSUB
connector for use by other image acquisition boards or to synchronize
multiple cameras.
•
CSYNC external mode—In CSYNC external mode, the 1408 device
receives an incoming video signal (composite or luminance) and an
external CSYNC from an external connector. The 1408 device takes
the incoming video signal and CSYNC and generates HSYNC,
VSYNC, and PCLK signals.
•
External lock mode—You can use this mode to synchronize to
a camera or any nonstandard video signal. In this mode, the
PCI/PXI-1408 receives HSYNC, VSYNC, and PCLK signals
for A/D sampling directly from the external connector.
Note
If you are using an interlaced camera in external lock mode, connect a FIELD signal
to the external connector. See Chapter 4,
, for more information.
