ABSTRACT
In 1990 the DMX standard was updated to DMX512/1990 Digital Data Transmission Standard for Dimmers and Controllers, and in 2004 a new revision, called DMX512-A, was adopted. A DMX network can be as simple as a single controller and a single fixture, or it can be very large and complex with multiple controllers, data splitters, gateways, and more. The physical layer of a DMX system comprises a line driver, a terminated transmission line, and at least one receiver. In fact some manufacturers built proprietary bi-directional communications capability into some of their equipment before it became a formal standard in 2004. Most wireless DMX systems use the same frequencies as Wi-Fi, which include the 2.4 GHz band and, in some parts of the world, the 5 GHz band. Data termination plays an important part in building reliability into a DMX data distribution system.
