Calpeda NCE HQ2 Instrucciones De Uso página 165

18.7 Relay output
Relay output for passive switching of external fault indication.
When disconnected, the pump is fault;
When it is closed, the pump is normal.
When the relay is disconnected,
the pump is fault;
18.8 External communication is RS485 and the protocol is Modbus RTU.
The communication line of the water pump needs to correspond to the A and B
signals of the external controller.
Relay output
When it is closed, the pump is normal.
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