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Old July 18th, 2013   #2
Task Group Member
Join Date: Aug 2008
Posts: 366

My interpretation has been that SUB_DEVICE_ALL_CALL should only effect Sub-Devices and not change the root at all.

In the case where someone sends a broadcast request to SUB_DEVICE_ALL_CALL, only responders that have sub-devices should act on the request.

How the respond gets a bit dicey when you have a mixed collection of sub-devices. Lets say you send a SET DMX_START_ADDRESS to a responder that has 2 sub-devices, but only one of the sub-devices supports the DMX_START_ADDRESS PID. Both "NACK Unknown PID" and "ACK" would be appropriate.
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