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Art-Net: Multiple controllers

Art-Net allows and supports multiple controllers on a network. When there are multiple controllers, Nodes will receive ArtPolls from different controllers which may contain conflicting diagnostics requirements. This is resolved as follows:

  • If any controller requests diagnostics, the node will send diagnostics. (ArtPoll->Flags->2).
  • If there are multiple controllers requesting diagnostics, diagnostics shall be broadcast. (Ignore ArtPoll->Flags->3).
  • The lowest minimum value of Priority shall be used. (Ignore ArtPoll->Priority).
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Art-Net: ArtPoll and ArtPollReply timeout

A Node must respond to an ArtPoll with an ArtPollReply within 3 seconds. If the Controller does not receive a response in this time it should consider the Node to have disconnected. It is a requirement of Art-Net that all controllers broadcast an ArtPoll every 2.5 to 3 seconds. This ensures that any network devices can easily detect a disconnect.

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Art-Net: Implementing ArtPoll and ArtPollReply

In order to make a product visible in DMX-Workshop, the product must reply to an ArtPoll with one or more ArtPollReply. The screenshot below shows a Wire Shark capture of the ArtPollReply packets from a Data-Lynx IOP.

Common errors in formatting ArtPollReply are:

1) The text signature at the top of the packet is “Art-Net”. It is case sensitive.

2) DMX-Workshop only listens on Port 6454 (decimal).

If you have difficulty making your product visible in DMX-Workshop then submit a Wire Shark capture on a support ticket and we will try to help.

artpollreply in wireshark
artpollreply in wireshark