Gree VRF User manual

VRF Protocol Gateway

Contents
User Notice................................................................................................................ 1
Chapter 1 Installation............................................................................................... 2
1 Introduction to System.......................................................................................... 2
2 Introduction to Parts ............................................................................................. 4
2.1 Parts List.........................................................................................................................4
2.2 Gateway ME30-24/D1(BM).............................................................................................4
2.3 Introduction to optical isolation convertor........................................................................5
2.4 Introduction to optical isolation relay...............................................................................7
3 Product Installation............................................................................................. 10
3.1 Product Size..................................................................................................................10
3.2 Spatial Size for Electric Control Cabinet Installation.....................................................10
4 Gateway and BMS adopt Modbus RTU communication connecting method 10
4.1 Selection of communication material............................................................................11
4.2 Connecting method of communication between gateway and air conditioner..............11
4.3 Setting of communication connection...........................................................................12
5 Gateway and BMS adopt Modbus TCP or BACnet protocol communication
connecting method ................................................................................................ 13
5.1 Selection of communication cable material...................................................................13
5.2 Communication Connection Method.............................................................................13
5.3 Communication Connection Configuration ...................................................................14
5.4 Gateway configuration:.................................................................................................15
Chapter 2 Commissioning Operation ................................................................... 17
1 Commissioning of hardware .............................................................................. 17
1.1 DIP Switch ....................................................................................................................17
1.2 LED Display..................................................................................................................19
1.3 Button............................................................................................................................19
2 Commissioning of communication.................................................................... 20
2.1 Communication commissioning with air conditioning equipment..................................20
2.2 Communication commissioning with BMS equipment..................................................20
2.3 Troubleshooting ............................................................................................................22
Chapter 3 Maintenance .......................................................................................... 25
1 Troubleshooting for common errors of BMS .................................................... 25
Attachment A TCP/IP Setting................................................................................. 26

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User Notice
Dear customer:
Please read this manual carefully prior to installation and operation and strictly observe all
installation and operation instructions covered in the manual.
Special attentions shall be paid to the following marks:
WARNING! This mark indicates operation, which if improperly performed, might lead to the death or serious
injury of the users.
CAUTION!
This mark indicates operation, which if improperly performed, might possibly result in damage to
the device.
WARNING!
(1) Installation shall be performed
by the qualified personnel; otherwise it would result in a fire hazard or electric
shock.
(2) Do not place the plug of the power supply into the socket before it is dried and cleaned.
(3) Cut off the power supply before touching the electric element.
(4) Do not touch this device with wet hands; otherwise it would result in electric shock.
(5) Do use the power cable specified in this manual; otherwise it would result in a fire hazard.
(6) When the power cable is reversely connected or the power supply is beyond the rated
range, it would result in
a fire hazard or even damages to this device.
(7) For PLUGGABLE EQUIPMENT, the socket-
outlet shall be installed near the equipment and shall be easily
accessible.
(8) Do install this device inside the electric control cabinet which is located indoor and then is locked.
(9) Do install this device where it will not be subject to the electromagnetic interference or heavy dust.
CAUTION!
(1) Be sure the specified adaptor is used; otherwise this device would work improperly or even be damaged.
(2) Be sure this device is setup in place; otherwise it would result in communication fault.
(3)
Be sure the communication line is connected to the correct interface; otherwise it would result in
communication fault.
(4) After connection, lines should be protected with insulating tape to avoid oxidation and short circuits.
(5)
Risk of explosion if battery is replaced by an incorrect type, dispose of used batteries according to the
instructions.
(6) Normal working conditions for Gateway：
①Temperature : -20 ～60℃;
②Humidity: less than 85%,except for the condensation of dew;
③
Location: indoor (it is highly recommended to install this product in the electric control cabinet), not subject to
direct sunlight, rain and snow etc.
(7) Graphics in the instruction manual are for reference only.

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Chapter 1 Installation
1 Introduction to System
Gree VRF Protocol Gateway ME30-24/D1(BM) can realize the data exchange between air
conditioner and Building Management System (the following refers to BMS), providing standard
Modbus RTU, Modbus TCP and BACnet/IP building interfaces.
Through the gateway, administrator can conduct data collection, monitor and control of
operating status of multi VRF air conditioner in long distance, and can give out alarm of errors of
air conditioner in time. Moreover, it can provide protocol interfaces of Modbus RTU, Modbus TCP
or BACnet/IP to connect BMS. There is no need for maintenance personnel to set and manage
each set of units on the spot, they just need to sit in front of the computer to perform operation
management such as viewing the operating status of building air-conditioning system, ON and
OFF status of unit, setting of temperature and humidity, etc., which not only greatly improves work
efficiency, but also reduces labor costs and management costs.
The gateway is applicable to GMV5S all DC inverter multi VRF unit, GMV5 DC inverter multi
VRF unit, GMV water source heat pump DC inverter multi VRF unit, GMV ES DC inverter multi
VRF unit, GMV Tops residential multi VRF unit, GMV Star residential multi VRF unit, GMV6 multi
VRF unit.
Note: Later the Gree VRF Protocol Gateway ME30-24/D1(BM) is called gateway for short.
Internet topological graph:
Fig. 1 Network topology for communication method of Modbus RTU

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Fig.2 Communication method of BACnet and communication method network topology of
Modbus TCP
Internet topological graph statement:
485 bus: L1 shown in Fig. 1 is 485 bus, one 485 bus can connect to 254 gateways at most.
Network table: L1 shown in Fig. 2 is general network cable, the gateway can connect to BMS
via the network cable.
CAN1 network: L3 shown in Fig. 1 and Fig. 2 is CAN1 bus, which consists of network and all
the outdoor units and indoor units of system; one CAN1 network can connect to 80 sets of indoor
units at most.
CAN2 network: L2 shown in Fig. 1 and Fig. 2 is CAN2 bus, which consists of gateway and
master outdoor unit of system; one CAN2 network can connect to 16 sets of outdoor units and 255
sets of indoor units. When the quantity of outdoor units exceeds 16 or the quantity of indoor units
exceeds 255, it should be divided into two CAN2 networks.
System: One system consists of one set of outdoor unit (one set of outdoor unit is a module
set, which can consist of 1~4 modules, that is, 1~4 sets of outdoor units) and its indoor unit.
Connectable quantity of units of gateway: One gateway can connect to 16 sets of outdoor
units and 255 sets of indoor units at most.

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Remarks:
（1）One 485 bus can connect to 254 gateways at most, if there a re other 485 equipment
in the 485 bus, the connectable gateway should reduce accordingly.
（2）It is recommended that the connecting quantity of gateway of 485 bus n is less or
equal to 16.
2 Introduction to Parts
2.1 Parts List
S=standard fittings; O=prepared by user; P=purchased by user
Name
Model
Material Code
Remarks
Supply Range
VRF Protocol
Gateway kit
Gateway components
ME30-24/D1(BM) NC20000160
Can connect to BMS
Protocol interfaces: Modbus
protocol, CAN protocol,
BACnet protocol
Hardware interface: RS485,
CAN, Ethernet

485 communication baud rate
9600, start bit 1 bit, data bit 8
bits, no parity bit, stop bit 1 bit
TCP communication:
gateway Modbus TCP fixed
interface: 502

UDP port in BACnet/IP mode:
BAC0
Major components: gateway,
instruction manual
S
Optical isolation
relay
Optical isolation relay
RS485 LN02200010
The total distance of the
communication cable needs to add
a relay every time it exceeds 800
meters, and it needs to add a relay
every time the quantity of Modbus
gateway exceeds 30. It needs to
be adopted when the conditions
are met.
P
Optical isolation
convertor Optical isolation convertor GD01 LN02200020 Only when BMS dopts RS232
method should the convertor be
adopted
P
Centralized control
cabinet
Prepared by user - - O
2.2 Gateway ME30-24/D1(BM)
2.2.1 Introduction of Functions
Gree multi VRF protocol gateway ME30-24/D1(BM) can realize data exchange between air
conditioner and BMS, providing standard Modbus RTU, Modbus TCP and BACnet/IP building
interfaces. The gateway is applicable to the Gree multi VRF unit model that adopts CAN protocol.

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2.2.2 Phicture of Gateway and Interfaces
2.2.3 Components
Gree VRF protocol gateway kit ME30-24/D1(BM) includes the following components:
VRF protocol gateway
One set
Instruction manual
One
2.2.4 Interface
（1）Power
The input power supply is 24V DC, there are two power supply input interfaces, only one is
needed during operation; the power supply output is not applicable in this device, please do not
connect to electric appliance, otherwise it may cause malfunction of gateway.
（2）Communication Interface
CAN comm port: connect it to the AC unit through the 2-core communication line to realize
the communication between Gateway and the AC which adopts CAN protocol.
RS485-1 comm port: connect to the BMS terminal through a two-core communication line to
realize the communication connection between the gateway and the BMS terminal or the
connection between adjacent gateways.
RS485-2 comm port: this device will not use this communication interface temporarily.
USB and SD card port: this device will not use this interface temporarily.
Ethernet comm port ETH0: realize communication through network cable and BMS.
Ethernet comm port CONFIG: this device will not use this interface temporarily.
2.3 Introduction to optical isolation convertor
2.3.1 Introduction to functions
The role of the optical isolation converter is to convert the RS232 signal of the computer serial
port and the signal of the RS485 bus. Only needed when the user’s BMS is RS232
communication.

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2.3.2 Outline
Note: The picture is for reference only.
2.3.3 Instruction of interface and indicator
No.
Interface Name
Instruction of Use
Remarks
1 Power interface Input 12VDC800mA Self-provided power
source of convertor
2
Communication
interface
A wire of RS485 connect to 485 terminal R+, B wire
connects to R
－
.
See the instruction
manual
3 Power indicator Constantly on when energized See the instruction
manual
4
Communication
indicator
TX and RX indicators flash when the communication is
normal
See the instruction
manual

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2.3.4 Dimension
2.3.5 Notices for installation
Warning! It must be fixed indoors to avoid collision, exposure to the sun or rain. It is
recommended to place it in the monitoring room with the computer.
Warning! The original equipment of the manufacturer must be used, and it is not allowed to
purchase alternative products of other models or brands.
Warning! An independent power supply is required, and sufficient 220V AC outlet must be
installed to supply power.
2.4 Introduction to optical isolation relay
2.4.1 Introduction to functions
Function of optical isolation relay:
（3）When the distance of the entire communication network node exceeds 800 meters,
the optical isolation relay is to ensure the signal integrity and prevent the signal from
attenuating in the case of long-distance communication.
（4）At present, the general optical isolation relay can support the integrity of the
communication signal of 32 nodes. When the number of communication nodes in the
network exceeds 32, the communication signal will be incomplete. In order to ensure
the reliable transmission of signals, we require that when the number of nodes in the
network exceeds 30, a relay must be used to transmit the signal to ensure the
integrity of the communication signal.

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2.4.2 Outline
Note: The picture is for reference only.
2.4.3 Instruction of interface and indicator

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No.
Interface Name
Instruction of Use
Remarks
1 Power interface Input 12VDC/800mA Self-provided power
source of relay
2 Communication
interface
A wire of RS485 connect to 485 terminal R+ See the instruction
manual
3 Power indicator Constantly on when energized See the instruction
manual
4 Communication
indicator
Data indicator flashes when the communication is normal See the instruction
manual
2.4.4 Dimension
2.4.5 Notices for installation
It must be fixed indoors to avoid collision, exposure to the sun or rain. It is recommended to
place it in the monitoring room with the computer.
The original equipment of the manufacturer must be used, and it is not allowed to purchase
alternative products of other models or brands. An independent power supply is required, and
sufficient 220V AC outlet must be installed to supply power.

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3 Product Installation
3.1 Product Size
3.2 Spatial Size for Electric Control Cabinet Installation
Gateway shall be installed in electric control cabinet; the front of gateway shall be hung
upward and fixed with 4 screws. See the following fig (for reference).
WARNING! Power cord and communication line of Gateway must conduct routing separately (the distance
shall be over 15cm); otherwise, it might lead to Gateway communication malfunction!
The thin real line shown in the figure is communication wire and weak current wire, the thick real line is strong
current wire. Above lines are only for reference.
4 Gateway and BMS adopt Modbus RTU communication
connecting method
Gateway communication system include:
（1）The communication between the gateway and BMS;
（2）The communication between the gateway and air conditioner.

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4.1 Selection of communication material
Communication
system
Cable material
Communication
cable L(m)
Cable diameter
(mm
2
)
Material standard Remark
The communication
between gateway
and BMS via
Modbus bus
Shielding
light/general
PVC sleeve
twisted pair
copper core
cord
L≤800 ≥2x0.75 IEC 60227- 5:2007
When the
communication
distance is over
800m
4.2 Connecting method of communication between gateway
and air conditioner
Caution! Communication connecting wire of gateway must adopt string connection, rather
than star connection.

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NOTICE! In the Modbus, when the quantity of connected gateway exceeds 30 or the
communication distance exceeds 800m, one more PV isolation relay should be added, and
connect the R+ and R- terminals of PV isolation relay to the RS485-1 communication interfaces
R+ and R- of the adjacent gateway.
4.3 Setting of communication connection
RS485-1
R+ R-
(A1) (B1)
RS485-1
R+ R-
(A1) (B1)
①
②
③
Gateway
Gateway
Step 1: Ensure the first gateway that should connect to BMS terminal, connect the RS485-1
communication interfaces R+ and R- of the gateway to the BMS terminal with communication
cable; as shown in Step ①in the figure.
Step 2: Connect the RS485-1 communication interfaces R+ and R- of the gateway to the
RS485-1 communication interfaces R+ and R- of the second gateway with communication cable;
as shown in Step ②in the figure.
Step 3: Connect other gateways in turn; as shown in Step ③in the figure.

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5 Gateway and BMS adopt Modbus TCP or BACnet protocol
communication connecting method
Gateway communication system includes:
（1）Communication between gateway and BMS;
（2）Communication between gateway and air conditioner.
5.1 Selection of communication cable material
Communication
system Type of material
Communication
wire between
gateway and
air conditioner
L(m)
Cable
diamter
(mm²)
Material
standard Remark
Communication
between gateway
and BMS via
network cable
10BMSE-T or
100BMSE-TX
interleaving
network cable
or
100BMSE-TX
parallel
network cable
L≤80 - -
If the gateway directly
connects to PC, it needs
interleaving network cable.
If the gateway connects to
PC via router, it adopts
parallel network cable.
Communication
between gateway
and air conditioner
Shielding
light/general
PVC sleeve
twisted pair
copper core
cord
L≤500 ≥2×0.75 IEC 60227-
5:2007
Total communication length
should not be over 500m
5.2 Communication Connection Method
（1）Communication connection between Gateway and BMS

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（2）Communication connection between Gateway and AC units (n is the quantity of ODU
system, n ≤ 16)
NOTICE!All communication connection lines under Gateway must be in series connection,
star connection shall not be adopted.
5.3 Communication Connection Configuration
（1）Communication line connection between Gateway and PC:
Connection diagram between Gateway and PC user side:
1) Adopt cross connection network cable, Gateway shall directly connect to PC.

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2) Adopt parallel network cable, Gateway shall go through router to connect to PC.
（2）Communication line connection between Gateway and AC units:
When gateway is connected to main control unit of ODU, ODU with the address dial-up of 0
must be connected.
CAN G1 G2
D1D2 G1G2
1 2
ON ON
Main control
Unit of ODU
……
Subordinate
Unit of ODU
5.4 Gateway configuration:
One gateway connects to 16 sets of systems and 255 sets of indoor units simultaneously.
After installation, the parameters of gateway should be set. Before setting the parameters of
gateway, please set the IP address of PC as the same with the IP address in the same network
segment of gateway, as refer to appendix A; and then open the browser (IE10 and above version,
Firefox or Google), input the default IP address of gateway: http://192.168.1.150, default user
name: config, password: config; as shown below.
Setting of gateway protocol functions:
After inputting user name and password, click the arrow to enter the setting interface, as
shown in Fig. 7.12, 7.13, and 7.14; in the setting interface 1, you can select the protocol function;
in the setting interface 2, you can set the IP parameters of gateway; in the setting interface 3, you
can set the equipment information.
Note: When the gateway is energized, it will conduct default Modbus protocol function, when select to
reset the gateway and log on the gateway setting interface again, the protocol option of interface 1 is
blank, you can select according to demand.

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The settable parameters: IP address of gateway (in which setting of IP address: master unit
number should not be 0, all 0 refers to the whole network, such as 192.168.1.0; master unit
number should not be all 1, all 1 refers to broadcast address, such as 192.168.1.255; it is not
recommended to set the address by user, otherwise it may cause problems such as the network is
not accessible), subnet mask of gateway, default gateway, gateway name, gateway ID. User can
set by himself/herself according to the actual needs. After setting, click the arrow, the interface will
pop up a window to ask: Whether to restart the gateway to make the setting come into effect?
Click yes and then the gateway is restarted.
Chapter 2 Commissioning Operation
1 Commissioning of hardware
1.1 DIP Switch
NOTICE!
Before using this device, please conduct DIP switch setting first, otherwise the unit will not
function normally!
Gateway dial-up setting area is consisting of function DIP switch code.
（1）Diagram of Dial-up Machine
（2）The 1st Lever of Functional DIP Switch—CAN2 Bus Matched Resistance Setting
Main control ODU or gateway at the top/end of CAN2 bus must be with matched resistance;
otherwise the communication might be wrong!
※CAN2 bus: Specific meaning shall refer to the specification in Fig Internet topological
graph.
The No.1 dial-up button in function dial-up machine shall be used in the setting in the matched

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resistance of CAN2 bus in this gateway.
When the gateway is at the top/end of CAN2 bus, the gateway shall be with the matched
resistance, then dial the No.1 function dial-up machine to 1.
When the gateway is not at the top/end of CAN2 bus, the gateway is not with the matched
resistance, then dial it to 0.
（3）The 2st Lever of Functional DIP Switch—485 Bus Matched Resistance Setting
The 2nd dial code of the function dialer is used for setting the matching resistance of the
gateway of 485 bus.
When the controller is at the beginning/end of the 485 bus, the controller needs to be set to be
with matching resistance, then the second bit of function dialer is set to 1; when the controller is
not at the beginning/end of the 485 bus, set the controller to be without matching resistance, and
set the dial code to 0.
（4）The 4st Lever of Functional DIP Switch—Gateway Reset Selection Bits
When there’s an error in configuring Gateway IP address, subnet mask, default gateway,