When do I need to set "Dry Contact"?

When the user uses the inverter communication control external device function, you can enter here to set the parameters of the external response control. For the setting method, please refer to the user manual of the compatible external device. If the user uses the inverter dry contacts to control external devices (such as heat pumps) through the Adapter box, please refer to the Adapter box quick installation manual to set the parameters here.