DMX512

DMX connector
XLR5 pinouts
Type Lighting control
General specifications
Hot pluggable Yes
Daisy chain Yes
External Yes
Cable 2 pair, 24 AWG, 7x32 stranded, tinned copper, 6.9 left hand twist/ft
Pins 5
Connector 1
Electrical
Max. voltage +6 VDC per pin
Max. current 250 mA
Data
Bitrate 250 kbit/s
Protocol asynchronous, half-duplex, serial protocol over a two-wire bus
Pinout
Pin 1 Signal Common
Pin 2 data 1-
Pin 3 data 1+
Pin 4 data 2-
Pin 5 data 2+
Prohibited non-DMX connector
XLR3 pinouts
Type Lighting control
General specifications
Hot pluggable Yes
Daisy chain Yes
External Yes
Pins 3
Connector 1
A DMX splitter/buffer. It allows a DMX universe from one source to be repeated to several chains of devices, in order to avoid signal degradation due to long cable runs.

DMX512 is a standard for digital communication networks that are commonly used to control lighting and effects. It was originally intended as a standardized method for controlling stage lighting dimmers, which, prior to DMX512, had employed various incompatible proprietary protocols. It quickly became the primary method for linking controllers (such as a lighting console) to dimmers and special effects devices such as fog machines and intelligent lights.

DMX512 has also expanded to uses in non-theatrical interior and architectural lighting, at scales ranging from strings of Christmas lights to electronic billboards and stadium or arena concerts. It can now be used to control almost anything, reflecting its popularity in all types of venues.

DMX512 uses a unidirectional EIA-485 (RS-485) differential signaling at its physical layer, in conjunction with a variable-size, packet-based communication protocol. DMX512 does not include automatic error checking and correction, and therefore is not an appropriate control for hazardous applications,[1] such as pyrotechnics or movement of theatrical rigging. However, it is still used for such applications. False triggering may be caused by electromagnetic interference, static electricity discharges, improper cable termination, excessively long cables, or poor quality cables.

The DMX standard is published by the Entertainment Services and Technology Association (ESTA), and can be downloaded from its website.[2]

  1. ^ United States Institute for Theatre Technology -- Resources > Standards > DMX512 > DMX512 FAQ -- http://www.usitt.org/Resources/Standards2/DMX512/DMX512FAQ#a12 Archived 2011-10-20 at the Wayback Machine -- ...DMX512 is not an appropriate control protocol for hazardous applications...
  2. ^ "ESTA Technical Standards Program, published documents". tsp.esta.org. Retrieved 18 January 2024.