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Old January 18th, 2016   #4
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Join Date: Apr 2009
Location: Dartmoor, Devon, England
Posts: 56
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A controller has it's own UID, used in all commands to responders. Responses to the controller are addressed to the controller by it's UID.

There's nothing, that I'm aware of in the standard, to prevent a controller acting as a responder on receipt of a command.
Hamish Dumbreck
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