How do you view video inputs 4,5,6,7 from the IMAQ-A6822 with PCI-1410?

[JOhnDR]

The PCI-1410 framegrabber board can select one of 4 video inputs.  When connected to the IMAQ-A6822 cameras connected to video 0,1,2,3 can be viewed.  There are inputs video 4,5,6,7 as BNC connectors.  Is it possible to have these as inputs to the PCI-1410 and therefore be able to view one of 8 cameras?

[Chris_1890]

[The NI PCI-1410 includes four external triggers, four camera control signals, seven RTSI bus triggers, and four video synchronization signals.] P. 2-1, NI PCI-1410 User Manual

Because the 1410 only has four camera control signals and four video synchronization signals, it can only be connected to 4 cameras at once.  The reason is when the trigger is received for a particular channel, the board will acquire the next full frame from the desired channel.  Therefore there must be one trigger line for each video channel.  Because of this, there is no way for it to trigger acquisition for more than four cameras.  The only way to use all 8 of the video inputs on the A6822 would be to use two framegrabbers with four video inputs each.

There are also some timing considerations to be made when trying to use multiple cameras with one board.  Since the 1410 only has one ADC, the video inputs are multiplexed.  This means that you cannot acquire from multiple cameras at the full frame rate.  The only way to achieve full frame rate acquisition from multiple cameras is to use one framegrabber per camera.