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Logic RDM Sniffer: Difference between revisions
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OLA has a text-based DMX/RDM sniffer that works with the Logic (it could easily be extended to work with the Logic 16). It can be found in [http://code.google.com/p/open-lighting/source/browse/#git%2Ftools%2Flogic tools/logic] directory of the OLA sources. | OLA has a text-based DMX/RDM sniffer that works with the Logic (it could easily be extended to work with the Logic 16). It can be found in [http://code.google.com/p/open-lighting/source/browse/#git%2Ftools%2Flogic tools/logic] directory of the OLA sources. | ||
Limitations: | |||
* the sniffer doesn't understand DUB responses yet since it looks for breaks. | |||
* it may struggle with signal timings that are at the edge of the E1.11 standard. If you experience problems with the sniffer please email the [http://groups.google.com/forum/#!forum/open-lighting Open Lighting Mailing List] | |||
Revision as of 16:32, 24 June 2013
The Saleae Logic makes an excellent DMX / RDM sniffer. With the Logic and a small amount of hardware you can build a sniffer for a fraction of the price of commercial units.
Parts
- A Logic or Logic 16, but see the note below.
- 485 driver circuit
- XLR connectors.
Electrical
You need some hardware to convert from the differential 485 levels to a signal which the logic can understand.
TODO: sean / josh explain this and post a circuit.
Software
Saleae Logic
Saleae provides the Logic App which works on Windows, Mac and Linux. The application has a plugin to decode DMX, but it doesn't understand RDM data. The tool is best for analyzing the signal timing rather than the high level messages.
OLA Sniffer
OLA has a text-based DMX/RDM sniffer that works with the Logic (it could easily be extended to work with the Logic 16). It can be found in tools/logic directory of the OLA sources.
Limitations:
- the sniffer doesn't understand DUB responses yet since it looks for breaks.
- it may struggle with signal timings that are at the edge of the E1.11 standard. If you experience problems with the sniffer please email the Open Lighting Mailing List
