E1.20 RDM (Remote Device Management) Protocol Forums

E1.20 RDM (Remote Device Management) Protocol Forums (http://www.rdmprotocol.org/forums/index.php)
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-   -   Cable shield connection questions (http://www.rdmprotocol.org/forums/showthread.php?t=370)

berntd May 25th, 2008 11:22 PM

Cable shield connection questions
 
Hello,

It is pretty cear from the DMX spec that a transmitter must have <20Ohm between shield and chassis and a receiver (non isolated) must have 100Ohm.

This is cool BUT what if a device can be a RDM controller AND a RDM responder, depending on the mode?

Is it expected to switch in and out a 100Ohm resistor?
If it needs to be switched, is there a way to do it without a relay?


Kind regards
Bernt


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