sacn universe and multicast port

Good morning everyone, I'm now getting into the ACN world and I need clarification.

In the SACN protocol there is the term UNIVERSE which indicates, from what I understand, the universe to which the 512 DMX channels that are sent belong.

Now I have set the multicast address to 239.255.0.1 and transmit the universe number 1 without problems.However, I also sent other universes to the same address, there too without problems.

I checked with SACN View where both unviverses and channels were activated or not ,and everything is fine.

On the ETC website, on the SACN MULTICAST CALCULATOR page I read that if I want to transmit universe 1, I have to use the address x.x.0.1 while if I want to transmit, for example universe 5, I have to use the address x.x.0.5.

In my tests I transmitted on the same address, both universes different from the calculated one (example universe 4 on address 230.255.0.1) and even more universes (example uni1,2,3,4 on address 230.255.0.1) without problems.

Using sacnview I read all configurations correctly.

My question is: why do I have to use universe>address correspondence? Am I obligated to use it? can I transmit multiple universes on the same address? does the term UNIVERSE... have two different meanings?

thanks to anyone who can clarify the concept for me.

Mario

Parents Reply
  • mmm....

    yes..I had seen it, but at this point could it be that the protocol provides only one IP address for a single universe uni1>ip1 uni2>ip2 and so on?I have not found any ref in 1.31 doc.
    However, I tried to send 4 universes on the same IP and the viewer decoded them without problems. I don't have real sacn peripherals available, I'm developing my own light control software and I'm trying to implement the protocol but i've this doubt: one ip for multi universe, ore one ip for one universe?
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