USB hub for myRIO

I wonder if myRIO supports a USB HUB.  If so, how many cameras can I plug it at the same time? I think that an additional power supply for usb hub is essential, but what else? Say that the bandwidth of the usb allows?

It depends on the data rate of the cameras that you connect. Just as it is POSSIBLE to connect to a bunch of cameras to an ethernet hub, if you add enough flow enough high, you will fill your bus and will have to drop frames. You will need to determine the maximum number of cameras yourself based on the data rate of the cameras and the ability of the USB interface bus. USB 2.0 can reach a theoretical speed of 480 Mb/s, but you will not reach this speed since you have above.

To calculate the data rate of your cameras, use (FPS) * (X_resolution) * (Y_resolution) * (Pixel_Depth (8 - bit, 10-bit, 12-bit etc.)). This will give you the absolute lowest data rate without taking into account overhead.

For example, a camera of monochrome 8 bit uncompressed 1280 x 1024 at 30 fps resolution will generate 314.5728 MB/sec without compression. Using this device, you will be able to use one of these cameras on the bus without frames.

If you use a camera pre to something like MJPEG compresses, you will need to consider as well.

Tags: NI Software

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