The connector is located on the J5 controller of the unit located within the electrical box. Extend out the box on its rails and remove the side cover.



The Modbus connector P504 is on the bottom of the controller and the dip switch SW503 used to configure is just to the left.
Here is the view looking up and the settings which can be configured as either 2 or 4 wire Modbus.




For further information concerning Modbus installation, tips and troubleshooting please refer to the O&M manual an User guide

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