Gree GMV5 Series Service Manual page 244

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.
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.
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.
3.4 Lines
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:
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.
4. Software Setup
4.1 Prerequisites
4.1.1 PC Configuration
Memory
Hardware
CPU
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
Connecting line
Min: 1 GB
Recommended: 2 GB or larger
10 GB available
Core 2 or later versions
Min: 1 GHz
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