To which pins of the COM connector on the inverter is the Smart Power Sensor connected?

For 3-phase units:

Pin 7 - RS485A +
Pin 9 - RS485B -

For 1-phase units:

Pin 4 - RS485A +
Pin 3 - RS485B -

If a SmartLogger3000 is used, it must be connected to a COM port on the SmartLogger.