Some controllers support PARAMETER_DESCRIPTION I know, but overall I don't think it has been that widely supported because of it's limitations. There expanded version of Parameter Description that will give you full ability to describe more complex PIDs is slated to get voted on to go out to it's next Public Review in a couple weeks (E1.37-5). It got held up for a while as we've been working on a revision to E1.20 and there were a lot of things in E1.37-5 that were going to be impacted by it. We've worked through all that now. The new Parameter Description stuff in E1.37-5 had minimal change since the previous PR. So keep an eye out around mid-October to hopefully see it in Public Review.
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Scott M. Blair
RDM Protocol Forums Admin
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