How to send data to a Wireless DMX Receiver
borazslo wrote 05/01/2017 at 09:15 • 0 pointsI would like to build a controller for my 2.4G DMX wireless female receiver. But what is the communication protocol of this stick? How can I send data in the right channel, id, and format?
There are different types of this receiver, and those should be compatible with each other. They have one button only to switch between ID 1 to 7. The "official" transmitters have also the ID settings. They need to match.
But how these stuff works? How should I set my wifi network so as this small thing could connect to it. Or if it is not a real wifi tcp/ip network related thing, how these things are communicating with each other?
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Hi,
First you should consider the RDM, that seems to be a replacement for which I could quicker find documentation.
The Wireless DMX and RDM look like a real time wifi protocol made by people who have a lot of money given the cables costs. It looks like a thick standard so you might look for eventually open source libraries, same as wifi I would expect any modification and custom build to be a bit complex...
https://en.wikipedia.org/wiki/RDM_(lighting)
http://www.rdmprotocol.org
http://tsp.esta.org/tsp/documents/published_docs.php
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DMX and RDM (bi-directional DMX) look like real time WIRED protocol for me. I more or less understand how does it work in a cable looking at this picture:
But what is this 2.4Ghz wireless layer used by this stick. Is it a kind of ethernet/ip protocol (ArtNet, E1.31 / sACN, ESP Net, KiNET, etc),?
Or is it an adaptation of the W-DMX G4S protocol? As http://wirelessdmx.com/about-us says:
"W-DMX™ is a true ‘plug and play’ system for transmitting both DMX and RDM and Ethernet data wirelessly, incorporating advanced technology including Adaptive Frequency Hopping Spread Spectrum (AFHSS) to dynamically avoid other radio frequency users, built-in dual-band for better performance in even the toughest environments, and RDM and Ethernet support to keep on top of your lighting system without fail. On top of this with new functions like Data-Safe for error correction and Invisi-Wire.
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well, I think that the only link between physical DMX and wireless DMX is the content of the data. it is like if you send DMX data over wifi which is over ip,... except DMX wireless has been optimised for low latency among other things, those optimisation are what probably make it diferent than wifi and much likely not less complex.
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It is probably a special purpose or proprietary wireless protocol (does the stick work with another manufacturer's transmitter?). Try taking it apart to see what kind of radio chips are in there.
Another option is to just build your own receiver and transmitter.
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The stick seems to work with other transmitters and sticks. So this should be a kind of standardized protocol. Here you can see the photo of the inside parts: (click to zoom in!)
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Can you ID the microcontroller or radio chip?
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Has anyone had any luck with this, I was planning on using an esp8266 to replicate the receiver, the main thing I am interested in is intercepting the wireless data but I am unable to find out anything about the protocol they use or find out how to intercept the 2.4ghz data.
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