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Old February 16th, 2017   #2
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Join Date: Aug 2008
Posts: 372

Originally Posted by berntd View Post
If I build a DMX transmitter / RDM host, what should I do with the RS485 Common?

My standard way is to be a non isolated transmitter as per the DMX spec.
I generally like to isolate everything (controllers and responders). The preferred topology in E1.11 is to have ground referenced controllers and isolated responders, but since you don't know what kind of devices will be connected I find it's best to isolate everything. Then you don't have to worry about ground loops forming through the DMX line.
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