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E1.31 (also called Streaming ACN) is a protocol for sending DMX512 data over the ACN (E1.17) family of protocols. Developed by ESTA, the specification is available at E1.31 is expected to become the new standard for transporting DMX over IP, replacing other protocols such as ArtNet and Shownet. For a list of devices / software that supports E1.31 see E1.31 Devices.


E1.31 works by adding a framing layer between the Root Layer and the DMP Layer. This new layer (called the E1.31 layer) adds properties such as the universe number, the source priority & sequence numbers.


The standardized version of E1.31 is 0.46. A pre-release specification was published as version 0.2 which is implemented by some software.

Expected Extensions

From, E1.33 is expected to extend E1.31 to support RDM.

ANSI numbers

Many DMX related standards have been numbered/revised by the American National Standards Institute.

Entertainment Technology -- USITT DMX512-A -- Asynchronous Serial Digital Data Transmission Standard for Controlling Lighting Equipment and Accessories . See DMX

ANSI E1.17 2006 - Entertainment Technology - Architecture for Control Networks . DMX over ACN

Entertainment Technology--Remote Device Management over USITT DMX512 . RDM over DMX

The above documents can be obtained from

Note that DMX512-A was updated in 2004 and again in 2008: (regarding text messages in UTF-8, update rate almost up to 20*44 Hz, corrections of errors and clarifications)

The RDM protocol is to be extended with BSR E1.37 e.g. for bulk data transfer.