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The optical port shares the same modbus address (unit ID) as the rs485 communication connection. When the meter is powered up, the display screens start scrolling information. The second screen in the scroll sequence is UID. This is the Modbus Unit ID of the meter.
Note: For new meters, the default Modbus ID can be determined by adding 100 to the last two digits of the serial number.
e.g. Unit ID = 113