Multi Task Device Channels - Definition

We have a lamp that uses 4 DMX addresses (it has 4 channels if I dare use that term!), 3 are straight forward Red, Green and Blue intensities based on a  0-256 (0-100%) DMX value coming down the pipe. One though, is 'broken up', sub divided (whatever) whereby different ranges of the 0-256  control different features. e.g. 0-128 is a master dimmer. 129-160 various strobe options. And the 160-256 area is used to control yet other functions/features. So we need to take each of these (what I call sub ranges) out to be controlled independently. What would be the ETC term for such a 'sub range' multi layer channel?

And another; We have a moving head that uses 256 x 256 (two DMX channels) to provide very smooth Pan and Tilt. How do we refer to two (or perhaps more) DMX 'channels that control a single device feature? Is it correct (acceptable) to interchange 'feature' and 'parameter'?

Of course we nowadays often meet fixtures (I.E a device controlled by multiple addresses) that have both multi function per a single DMC address and multi DMX addresses for a single (P/T perhaps) feature.  

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  • Terminology:

    Two Addresses controlling one parameter is called 16bit. One DMX address has 8bit, i.e. 0-255. So two addresses have 16bit (0-65536). The one doing coarse control is sometimes called MSB, the one doing fine control can also be called LSB. Eos calls them DMX (coarse) and LDMX (fine).

    I would keep calling it a parameter. For me a feature would be e.g. Gobo. But that consists of multiple parameters like GoboSelect, GoboIndex/Speed.

    To make those split addresses controllable you want to use Ranges within a parameter in the fixture editor

  • Kind of cute calling it "16bit" I thought. Makes sense. I'm OK on bits, bytes MSB/LSB etc so now off to the fixture editor to see what's happening. Great thing about EOS is you can mess around on your own computer without having to sit at the console. I'm communicating with (Student) Capture, so controlling the MPDs can be a visual experience.

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