How to add a setpoint manager after cooling coil in an airloop through openstudio sdk python

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I would like to add a setpoint manager to control the humidity ratio after the cooling coil in an air loop, and I'm doing this through openstudio sdk python.

The python code for this is like: object.addToNode(node)

My question is that how to get the oulet node object of the cooling coil instead of supply outlet node of the air loop?

Thanks.