NACK Code to use for Subdevice that has no data for requested PID? - E1.20 RDM (Remote Device Management) Protocol Forums

ericthegeek · February 24th, 2016

Asymmetrical Sub-devices have long been a grey area. The problem you're raising is similar to when you have a dimmer rack with both dimmer and relay modules installed. There are PIDs that make sense for some modules, but not for other modules.

I think the best you can do is declare the superset of all PIDs in the Supported Parameters list, and when an inapplicable PID is sent, NACK it with Unknown PID.

Sub optimal to be sure, but the best you can do with the current doc. In a future rev, perhaps allow each sub-device to declare a different list of PIDs?

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February 24th, 2016	#1
ericthegeek Task Group Member Join Date: Aug 2008 Posts: 390	Asymmetrical Sub-devices have long been a grey area. The problem you're raising is similar to when you have a dimmer rack with both dimmer and relay modules installed. There are PIDs that make sense for some modules, but not for other modules. I think the best you can do is declare the superset of all PIDs in the Supported Parameters list, and when an inapplicable PID is sent, NACK it with Unknown PID. Sub optimal to be sure, but the best you can do with the current doc. In a future rev, perhaps allow each sub-device to declare a different list of PIDs?