Is there any priority of the 2pcs RJ45 ports of the sending card for LED Displays?
Yes it is.
Take NOVA MSD300 sending card as an example, see below picture, port 1 is the priority port.
So if your screen is less than 650000pixel, use port 1 only to connect receiving card and loop all of receiving cards.
If your screen is more than 650000pixel, connect port 1 with receiving cards group1 by CAT5 cables, then connect port 2 with receiving cards group 2 by CAT5 cables.
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