[Solution] connect 2 RGB unit
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import unit rgb3 = unit.get(unit.RGB, unit.PORTA) # set 1-3 rgb in first RGB unit rgb3.setColor(1, 0xffffff) rgb3.setColor(2, 0xffffff) rgb3.setColor(3, 0xffffff) # set 4-6 rgb in second RGB unit rgb3.setColor(4, 0xffffff) rgb3.setColor(5, 0xffffff) rgb3.setColor(6, 0xffffff) # if you have three or more RGB unit, # you can use 7, 8, 9 as the number