Gelstream Scrollers analogue control

[Robertdazzler]

Gelstream can be controlled by either DMX or +10V analogue as provided. An option is available to internally change the analogue to -10V ( Strand) or 5V. Jumpers j1 and J2 are provided but instructions are very vague about this aspect. I am assuming that one jumper sets polarity and one voltage but which one? I could use DMX but that ties up precious channels. I have a couple of Strand analogue desks and would prefer to use these.

 

I have had all the information available from AC Lighting but this aspect is not adequately covered. Suggestions please.

 

 

 

[alexforey]

Instead of changing the polarity inside the scroller, could you just rewire a -10V cable to +10V by switching the ground and positive?

[Robertdazzler]

Hi Alex

 

Possibly is the answer. Gelstream has its own internal power supply so if only one unit was concerned we are only talking potential difference so fine. I want to control 4 units from a common analogue desk so all 4 units will be commoned together on the positive line which may not be good. I am reluctant to try it as I can't risk damage because so little information is available for these things.

 

 

 

[alistermorton]

Swapping the polarity of a multicore would be quite a job. You could install a polarity inverter at each fixture, or engineer a solution at the send end, but either way it's not going to be trivial.

[timsabre]

Can't you just try setting the jumpers and testing what works? There's only 4 combinations...