Communication Board; Communication Wire; Operation Instruction; Installation Notices - Gree GMV-S120WL/A-S Service Manual

3.2.3 Operation Instruction


Power LED: a red light. If the red light is on, it indicates normal power supply. If the red
light is off, it indicates the power supply of converter is not normal.

Communication LEDs: yellow lights. When converter is working and the computer is
transmitting data, the TX data transmitting light will be flickering. When units are
uploading data to the computer, the RX data receiving light will be flickering.

Function LEDs: green lights

When converter is under RS485 data transferring mode, the function LED of RS485 to
USB will be on.

When converter is under CAN data transferring mode, the function LED of CAN to USB
will be on.

When converter is under HBS data transferring mode, the function LED of HBS to USB
will be on.

USB interface: connect USB data wire.

CAN interface: When converter is under CAN communication mode, connect air
conditioner's CAN data interface. CAN interface exhibits no polarity (A and B are equal).

HBS interface: When HBS converter is under HBS communication mode, connect air
conditioner's HBS data interface. HBS interface exhibits no polarity (This interface is not
yet available for Gree debugger and the monitoring software).

RS485 interface: When RS485 converter is under RS485 communication mode, connect
air conditioner's RS485 data interface. RS485 interface exhibits polarity and terminal A
and B are different.

3.2.4 Installation Notices


Install indoors. To avoid collision, it is suggested to place it in the monitoring room
together with the computer.
 No need of power supply. Power is supplied through computer's USB interface.

3.3 Communication Board

Communication board is mainly used for transferring data. It functions similar with a patching
board. If units are far away from the monitoring computer, communication board can be used for
connection.

3.4 Communication Wire

3.4.1 USB Wire
Connect USB wire with computer's USB interface at one end and with the USB interface

of USB data converter at the other end, as indicated below:
GMV5 Home DC Inverter Multi VRF Units
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