i think you misunderstand the concept of the ArtAddress packet within the artnet spec-

Merging is not implemented in either LTP or HTP mode as specified by the ArtAddress packet.

this is a configuration packet not an implementation -

this is a packet that tells a device to do configure something - if it wants to - not an implementation-
it is a configuration specifically for an artistic licence box - usually because they lack any kindof user interface - buttons or web interface -

typically these packets are only used by artistic licence - as other manufacturers have different functionality- that does not fit into 'the artnet spec' as artistic licence sees it-

the confusing come about because artistic licence manufactures its own products to do these things- and it is talking about configuring its own products-
and in particular you should never assume that any other device other than an artistic licence device will actually be reconfigured by this or any other packet-

there is no requirement for an ELC product to respond to - or be reconfigured by the ArtAddress packet- it is not an implementation.

Quote Originally Posted by Mr_P View Post
Merging usually requires hardware - ie: an Artnet box (node)
However, it is also possible with some software:
http://www.artisticlicence.com/index..._id=&order_id=

Art-Net II Protocol Release V1.4 Document Revision 1.4ak 9/11/09 (extract)
Data Merging:
The Art-Net protocol allows multiple nodes or servers to transmit ArtDmx data to the same universe.
A node can detect this situation by comparing the IP addresses of received ArtDmx packets. If ArtDmx packets addressed to the same Universe are received from different IP addresses, a potential conflict exists.

Merge is implemented in either LTP or HTP mode as specified by the ArtAddress packet.

When a node provides multiple DMX512 inputs, it is the responsibility of the Node to handle merging of data. This is because the Node will have only one IP address. If this were not handled at the Node, ArtDmx packets with identical IP addresses and identical universe numbers, but conflicting level data would be transmitted to the network.