Check out this manufacturers link for basic operation and wiring for the currently popular LED/LCD units - select device, then product details from the side menu:
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It appears that the 3 speed enabled controllers require the line to be set to the following voltage levels;
Low = 1volt
Mid = 2volt
High = 3volt
Google Translate
It appears that the 3 speed enabled controllers require the line to be set to the following voltage levels;
Low = 1volt
Mid = 2volt
High = 3volt
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