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What would cause 900-2RS not to provide voltage on O2 for double door application?

There is a jumper on 900-2RS that is field selectable for individual or sequential mode.

If jumper is set for individual, input I1 will activate output O1and I2 will activate output O2.

If jumper is set for sequential, input I1 or input I2 will activate both outputs O1 and O2 in sequence. 


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