Numerous of the Art-Net packets contain Version numbers.
These can be either the version number of Art-Net or the Node’s version number. The terms ProtVerHi / ProtVerLo are used to describe the Art-Net protocol version number. This has never been changed and is set at:
ProtVerHi = 0
ProtVerLo = 14
The terms VersInfoH / VersInfoL are used to describe the Node’s version number. This field is defined by the manufacturer and usually contains the firmware revision number. The ArtPollReply message contains this information.
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).
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.
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.