sACN: Artistic Licence products
Posted by Wayne Howell on 12 October 2014 08:35 AM
The sACN (Streaming ACN) protocol has been added to the entire range of Artistic Licence ethernet to DMX512 nodes. The differences between Art-Net and sACN lead to some minor clashes which this document seeks to clarify. All our ethernet products used a common firmware base called AL5K. The products can all be updated with the latest release by DMX-Workshop.
In Art-Net, universes are called Port-Address and number from 0 to 32,767. There are 32,768 unique numbers.
In sACN, universes number from 1 to 63,999. There are 64,000 unique numbers. The standard reserves the values of 0 and 64,000 to 65,535 for future expansion.
Clearly there is the potential for confusion over the number '0'. If a universe is set to '0' and the sACN protocol is selected, Artistic Licence products will use a universe value of '1' instead.
The sACN protocol uses a concept called Component Identifier (CID) as a method to optionally distinguish unique streams of data. The current (v1-82) firmware release does not honour the CID. Firmware versions from v1-90 honour CID as defined in the table below.
The sACN protocol uses a concept called Priority as a method to define the priority of a stream. The current (v1-82) firmware release does not honour the Priority. Firmware versions from v1-90 honour Priority as defined in the table below.
Merging and Arbitration:
The following table defines how sACN packets A & B are arbitrated or merged when directed to same universe.