Gree UM600PH/A-M, Service Manual

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GREE Duct type Ducted Type Split Air-Conditioner Units
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(5) If units you want to monitor are already connected, and able to communicate normally, with
correct COM and protocal, then you may click “Connect” to enter the interface of numbers.
Otherwise, connect in accordance with the connection diagram shown below.
(6) COM selection: the serial port in your computer can be detected automatically. You just need to
select your desired serial port.