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New Edition of DMX512-A Available

PLSN Staff • News • January 21, 2009

NEW  YORK—A new edition of a lighting protocol that started with DMX 512 is now available. ANSI E1.11 – 2008, Entertainment Technology – USITT DMX512-A, Asynchronous Serial Digital Data Transmission Standard for Controlling Lighting Equipment and Accessories, can now be purchased from The ESTA Foundation.

The path to the document starts at http://www.estafoundation.org/pubs.htm . The list price is $40; member and quantity discounts are available. ANSI E1.11 – 2008 is the most recent updating of the ubiquitous lighting control protocol that started with the USITT DMX512 standard in 1986. It corrects errors and clarifies text in the 2004 edition and adds functionality.

An important clarification is the maximum update rate. The maximum rate is 44 Hz if 512 data slots are being sent, but it can be almost 20 times faster if a data packet contains fewer slots. This has been true ever since the original USITT DMX512, but some receiver manufacturers have missed or ignored this detail.

The new edition also adds an Alternate START Code for UTF-8 transmission so that languages that can't be rendered in ASCII can be used for sending diagnostic text messages. The 2004 edition only allows text messages encoded in the American Standard Code for Information Interchange (ASCII), which only supports American English and a few other languages that use the simple Latin alphabet.

The 2004 edition is now obsolete. Anyone designing new DMX512 products is encouraged to use ANSI E1.11 – 2008 rather than the old 2004 edition. However, the 2004 edition will continue to be sold on The ESTA Foundation website as a service to people trying to understand the requirements of a contract or request for quotation that references it.

For more information, please contact:

Karl G. Ruling
Technical Standards Manager
ESTA
875 Sixth Avenue, Suite 1005
New York, NY 10001

Phone: 1-212-244-1505
Fax 1-212-244-1502
standards@esta.org

To download the new protocol, visit http://www.estafoundation.org/pubs.htm.

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