Built-in jumpers are used in stack light modules to determine the wiring position.
The jumper of the bottom-most module should be set to position 1; this is the supplied jumper position for all modules.
When a second module is added on top of the first, the jumper must be moved to position 2.
The jumper of the third module must be moved to position 3, and so on.
A maximum of five modules may be added to a stack light.
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