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What is the purpose of Heartbeat / serial communications LED in EM64xxH series meter ?

The heartbeat / serial communications LED blinks to indicate the meter’s operation
and serial Modbus communications status.
The LED blinks at a slow, steady rate to indicate the meter is operational. The LED
flashes at a variable, faster rate when the meter is communicating over a Modbus
serial communications port.
You cannot configure this LED for other purposes.