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RDM Interpretation Questions Discussion and questions relating to interpreting and understanding the E1.20 RDM Standard.

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Old April 2nd, 2014   #1
docsale
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Default MINIMUM_LEVEL

Hi,

looking at this PID description, I was'nt able to fully understand how a responder should behave in response to MINIMUM_LEVE settings: if "On Below Minimum" = 1, what is dimmer supposed to do if DMX512 input is 0? It has to stay to minimum or turn off?

Thanks

Francesco
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Old April 2nd, 2014   #2
ericthegeek
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Hopefully this graphic will help explain the behavior.


Edit:
The forum software rescaled the image so it's a bit hard to read. Here's the text:

The graphic on the left:
One Below Minimum=1 A.K.A "Preheat"
Light output never goes below the minimum level.


The graphic on the right:
One Below Minimum=0
No light output until a minimum level is reached.
Typical behavior for dimmable fluorescents
Attached Images
File Type: jpg Min_Level.jpg (22.0 KB, 432 views)

Last edited by ericthegeek; April 2nd, 2014 at 11:33 AM.
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Old April 2nd, 2014   #3
docsale
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Quote:
Originally Posted by ericthegeek View Post
Hopefully this graphic will help explain the behavior.


Edit:
The forum software rescaled the image so it's a bit hard to read. Here's the text:

The graphic on the left:
One Below Minimum=1 A.K.A "Preheat"
Light output never goes below the minimum level.


The graphic on the right:
One Below Minimum=0
No light output until a minimum level is reached.
Typical behavior for dimmable fluorescents
Hi,

thanks for the support. So, in the "Preheat" configuration, output never goes OFF even if DMX512 is 0? To me it sounds quite strange but, if this is the standard requirement, i will follow it!!!
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Old April 2nd, 2014   #4
ericthegeek
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Quote:
Originally Posted by docsale View Post
thanks for the support. So, in the "Preheat" configuration, output never goes OFF even if DMX512 is 0? To me it sounds quite strange but, if this is the standard requirement, i will follow it!!!
Preheat is commonly used with incandescent lamps. By keeping the filament glowing at a very low level you can get much faster response when you want a fast turn-on. It's a major energy waster so not used as often as it was in the past, but still a useful feature. In shows with lots of flashing, it can also improve lamp life.


There's no requirement that you offer a preheat function. If your product supports preheat, you can use this PID to control and report it, but if you don't want to offer this feature, you don't have to. It's entirely your choice. It depends on the kind of product you are building, and the needs of your customers.

Last edited by ericthegeek; April 2nd, 2014 at 01:00 PM.
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Old August 1st, 2014   #5
este_
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Mostly, MINIMUM_LEVEL will go together with MAXIMUM_LEVEL. When setting both, the usable fader travel will be narrowed (between the yellow dotted lines).

Name:  Min_Level 2.jpg
Views: 256
Size:  6.6 KB

There is a simple way to widen the fader range. Simply calculate OUTLEVEL = INLEVEL*(MAX_LEVEL-MIN_LEVEL) + MIN_LEVEL and you can make use of the full fader range. We have added a parameter (flag) to do so and this would be a nice complement for the "ON_BELOW_ZERO" Flag. Maybe this option could be added to the MIN_LEVEL PID in future versions.

Last edited by este_; August 4th, 2014 at 11:14 AM. Reason: typos
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