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RDM Physical Layer/Hardware Discussion Discussion and questions relating to the physical or hardware layer of RDM.

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Old May 25th, 2008   #1
berntd
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Join Date: Jan 2008
Posts: 102
Default 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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