1 / 20

DMX-512 Data Splitter

ELT-2720 Electrical Project by Patrick Schlott. DMX-512 Data Splitter. Brief stage lighting history. Electronic control is about 40 years old Digital control is not as old, at least for stage lighting DMX-512 protocol standardized in 1985 by USITT

adrian-hernandez
Download Presentation

DMX-512 Data Splitter

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ELT-2720 Electrical Project by Patrick Schlott DMX-512 Data Splitter

  2. Brief stage lighting history • Electronic control is about 40 years old • Digital control is not as old, at least for stage lighting • DMX-512 protocol standardized in 1985 by USITT • Digital MultipleX with 512 pieces of information • Conventionals were operated using rheostat boards or autotransformer boards • Large, heavy, inefficient, needed many hands to run

  3. Resistance Dimmer

  4. Background – what is DMX512? • Not the rapper… • Data protocol for theatrical lighting control • Allows consoles (controllers) to “talk” to dimmers, scanners, movers, LEDs, and similar devices • Based on RS-485 (250kbaud) • Unidirectional • Connections use 5-pin XLR

  5. DMX-512: How it works • DMX uses differential signaling along 2 communication lines; 3 total (ground) • Voltage levels must be at least +/-200mV to drive device chips (+12/-7V max.) • Signal components shown here

  6. Physical network requisites • Twisted pair cabling is common practice • Helps for noise immunity • 120Ω characteristic impedance of cables • Terminators for DMX and RS-485 devices are 120Ω.

  7. Source-Device Operation • DMX devices (dimmers, LEDs, movers, etc.) are addressable on the network • They will only “listen” to the channels they are addressed to

  8. Typical setup

  9. DMX-controlled fixture configuration

  10. My project: Data splitter

  11. Data Flow Block Diagram

  12. Circuit Diagram

  13. Typical Bias and termination network

  14. PCB Design

  15. Why is an optosplitterhelpful? • DMX512 Optosplitters are used for theaters or other venues with large amounts of lights • Often in locations that would make linking fixtures a waste of cable • Fixtures are connected via “daisy chain”, opto allows for a star connection • Opto chip provides electrical isolation –also safety • Can only directly link 32 devices per universe

  16. Features • DMX Splitters already exist • But, more rugged, high quality models will have a bigger price • Basic components • Simple construction • Replaceable ICs

  17. More features • Sturdy 3-D printed plastic enclosure • Schottkey diode on power supply for reverse voltage protection • Power and DMX data LEDs on board • 3 outputs

  18. Are there any questions?

More Related