GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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software do not support this interface.
RS485 interface: When air conditioners work in RS485 mode, they are connected to the converter
over this RS485 interface. This interface is distinguished by polarity. Thus, the two contacts A and B
cannot be used interchangeably.
1.3.2.4 Precautions
The converter should be installed indoors and prevented from being hit. It is recommended that the
converter is installed in the monitor room with PCs.
The converter does not need to be connected to a power supply. It is powered by the PC via the
USB interface.
1.3.3 COM Interface Board
This board mainly transfers data. Providing a transfer function, the board serves to connect units
with control PCs when they are too distant to communicate.
1.3.4 Lines
1.3.4.1 USB Data Line
A USB data line is connecting to a USB interface of a PC at one end and to another USB interface of
a converter at the other end. See the following figure:
1.3.4.2 Connecting Line
Gree Debugger is accompanied with two lines: 1 m and 5.5 m. They are completely the same
except the length. The line is connecting to the COM interface of an air conditioning unit at one end and
to the CAN interface of a converter at the other end, as shown in the following figure. The air conditioning
unit can be either an IDU or an ODU.
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