压缩包里的为USITT+DMX512-A.pdf，是DMX512的英文标准协议。-The original version of the DMX512 Standard was developed in 1986 by the Engineering Commission of the

United States Institute for Theatre Technology, Inc. (USITT). Minor revisions were made in 1990. DMX512 has

gained international acceptance throughout the entertainment industry, even though USITT is not formally

accredited as a standards making body. The earlier versions of this Standard covered only data used by

dimmers. In practice this Standard has been used by a wide variety of devices　this version recognizes this fact.



In 1998, it became evident that additional updates to the Standard were necessary and formal recognition through

an internationally recognized standards organization was required. The USITT DMX512 Subcommittee issued

a Call for Comments in order to solicit recommendations for changes to the Standard. At the same time, USITT

transferred maintenance of DMX512 to the Entertainment Services and Technology Association (ESTA), which

is the secretariat for th