What is a waveform CSYNC acceptable for a 1409?

I understand the PCLK, HSYNC and VSYNC inputs because we use those with our current project.  I also understand the NTSC & RS - 170 video.  But the entry for CSYNC confuses me.  In the manual it says to the Mode "external" CSYNC, luminance, or signal composite video is connected to a VIDEO input as well as a signal of composite sync connected to the CSYNC.  If you already have a connected composite video why would you connect a separate CSYNC?  Also, what is the signal CSYNC supposed to look like?  It's exactly like a composite video signal without video and colorburst information?  I can't find any info or spec for what is needed at the entrance CSYNC.

It would be nice that if the technical specifications used to design the signal of the 1409 entries have been made public so we would all know exactly what each signal must look like.   Or, in the textbooks, at least to have signals of example designs that work in all modes of possible capture.

Thank you

Brad

Hello Brad,
Just to clarify the signal that you would see on the line CSYNC is a source of synchronization to synchronize multiple cameras that need to take pictures at the same time. In reality, CSYNC line send the PCLK, HSYNC and VSYNC as a signal and if you watch the master cameras or slave sends or receives these signals. You could connect an oscilloscope on this line to interpret the coming data, but ultimately, it would look like nothing more then a messy signal. I enclose the knowledge base how can I connect multiple video signals to a device from IMAQ Analog? which I think will help to clarify any other questions you may have on this subject. Thanks again and have a great day!

Kind regards

Nicholas K

Sales engineer Platinum

National Instruments

Tags: NI Hardware

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