PDL size and manufacturer specific parameter ID's - E1.20 RDM (Remote Device Management) Protocol Forums

sblair · July 10th, 2009

Jamie,

The intent of the PARAMETER_DESCRIPTION message was for it to only be used to describe very basic GET/SET parameters for a single function as these are very common and easy to understand. Every manufacturer tends to have those menu settings that are specific to their product, so this was an attempt at addressing that.

As a consequence of that this message was intended to be used where there are no other modifiers in the GET request or the SET response message that would need to be specified. For the situation you describe where you want to get/set curves for individual dimmer channels then it would make the most sense for the dimmers to be implemented as sub-devices. The sub-device number would then be used to specify which "channel" rather than putting it in the PD area as well.

Hope this helps clarify.

jamie · July 12th, 2009

Thanks for your answer scott.

Unfortunately not all manufacturers think the same way you do, otherwise things would be easier!

To get around the problem, I'll just require the user to select how many bytes they want to send with a manufacturer specific GET command. It's not the best solution, but at least it's generic and should work with most devices.

Regards,
Jamie.

July 10th, 2009	#1
sblair Administrator Join Date: Feb 2006 Posts: 441	Jamie, The intent of the PARAMETER_DESCRIPTION message was for it to only be used to describe very basic GET/SET parameters for a single function as these are very common and easy to understand. Every manufacturer tends to have those menu settings that are specific to their product, so this was an attempt at addressing that. As a consequence of that this message was intended to be used where there are no other modifiers in the GET request or the SET response message that would need to be specified. For the situation you describe where you want to get/set curves for individual dimmer channels then it would make the most sense for the dimmers to be implemented as sub-devices. The sub-device number would then be used to specify which "channel" rather than putting it in the PD area as well. Hope this helps clarify. __________________ Scott M. Blair RDM Protocol Forums Admin

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July 12th, 2009	#2
jamie Junior Member Join Date: Jul 2009 Location: Brisbane, Australia Posts: 3	Thanks for your answer scott. Unfortunately not all manufacturers think the same way you do, otherwise things would be easier! To get around the problem, I'll just require the user to select how many bytes they want to send with a manufacturer specific GET command. It's not the best solution, but at least it's generic and should work with most devices. Regards, Jamie.