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ION 8600 / 8650 COM4 Setup - "Not Available"

When trying to configure the COM4 port from the from panel of the meter, "Not Available" is displayed when selecting the COM4 port. 

Product Line:
ION 8600
ION 8650

ION 86xx Front Panel

The ION 8600 and 8650 Feature Set C meters do not support the COM4 port. The port physically exists and can be seen in the front panel menu, but it is disabled in the firmware. 

Use COM1 instead of COM4. If both RS485 ports are needed, the meter will need to be replaced with either an ION 86xx A or B meter. 
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