The ION7650 meter is reading a PM820 by Modbus Master via Modbus TCP/IP.
case#1, Disconnected the ethernet cable of PM820 and plug it back, the ION7650 takes 30 seconds to retrieve the data of PM820
case#2, Power cycle the power of PM820, the ION7650 takes 30 minutes to retrieve the data of PM820
Why Case#2 takes lots of time to getting the data back in?
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