Gree ME30-24/D1(BM) User manual

Owner's Manual
Original Instructions
VRF Protocol Gateway
Model:
ME30-24/D1(BM)

To Users
Thank you for selecting Gree product. Before installing the product, please
read this instruction manual carefully to know well about the product and use it
correctly. In order to install and use the product correctly to reach the expected
operational effect, the following instructions are hereby issued:
（1）The appliance is not intended to be used by the people with physical,
sensory or mental handicap or the people without using experience and knowledge
(including children), except that they are supervised or guided by a person
responsible for their safety when using the appliance. Children should be
supervised to ensure that they do not play with the appliance.
（2）This instruction manual is universal manual, some functions introduced in
this manual are only applicable to specific products; all the illustrations and
information in this manual are only for reference, and the control interface should be
subject to the actual interface.
（3）In order to better meet the customers’ demand, our company will improve
the product continuously and we have the right to conduct necessary modification at
any time due to the reason of sales or production, and will reserve the right of
modification without further notification.
（4）We will bear no responsibility for the personal injury, property loss or
damage of equipment due to improper installation and debugging, unnecessary
maintenance, non-observance of related national laws, regulations, and industrial
standards, violation of any stipulations of this instruction manual, etc.
（5）The final authority for the interpretation of this instruction manual belongs
to Gree Electric Appliances, Inc. of Zhuhai.

Contents
1 Safety Notices (Please be sure to abide) ..................................1
2 User Notice ..................................................................................1
3 Function and Parameter .............................................................2
3.1 Functional Overview ...............................................................2
3.2 Parameter Specifications........................................................3
4 Parts and Assembly ....................................................................3
5 Introduction for Gateway............................................................3
5.1 Interface..................................................................................3
5.2 LED Display ............................................................................4
5.3 Button......................................................................................5
5.4 DIP Switch...............................................................................5
6 Application...................................................................................8
6.1 Building Management System (BMS).....................................8
6.2 Internet Topological Graph......................................................8
7 Product Installation...................................................................10
7.1 Product Size and Spatial Size for Electric Control Cabinet
Installation...................................................................................10
7.2 Gateway and BMS adopt Modbus RTU Protocol
Communication Connecting Method...........................................11
7.3 Gateway and BMS adopt Modbus RTU Protocol
Communication Connecting Method...........................................14
8 BACnet Protocol........................................................................21
8.1 Structure of BACnet Protocol................................................21
8.2 Object and Property of BACnet Protocol ..............................21
9 Attachment A TCP/IP Setting....................................................23

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1 Safety Notices (Please be sure to abide)
WARNING: If not abide strictly, it may cause severe damage to the unit or
the people.
NOTICE: If not abide strictly, it may cause slight or medium damage to the
unit or the people.
This sign indicates that the operation must be prohibited. Improper
operation may cause severe damage or death to people.
This sign indicates that the items must be observed. Improper operation
may cause damage to people or property.
WARNING!
This product can’t be installed at corrosive, inflammable or explosive
environment or the place with special requirements, such as kitchen.
Otherwise, it will affect the normal operation or shorten the service life of the
unit, or even cause fire hazard or serious injury. As for above special places,
please adopt special air conditioner with anti-corrosive or anti-explosion
function.
2 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.

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WARNING!
(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 rever
sely 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 thi
s 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 t
his 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.
3 Function and Parameter
3.1 Functional Overview
Gree protocol gateway ME30-24/D1(BM) for multi VRF unit can realize data

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exchange between air conditioner and BMS system and provide building interfaces
for standard Modbus RTU, Modbus TCP and BACnet/IP. This gateway is applicable
to the Gree multi VRF unit that uses CAN protocol.
Note: The Gateway ME30-24/D1(BM) of multi VRF unit in the following will be
called gateway for short.
3.2 Parameter Specifications
3.2.1 Gateway TCP/IP Parameter (Default)
IP Address：192.168.1.150
Subnet Mask：255.255.255.0
Default gateway：192.168.1.1
CAUTION：After the TCP/IP parameters are altered, the gateway should be
restarted, then the parameters can come into effect.
4 Parts and Assembly
This kit includes the following parts. Please check before installation.
Gateway
1 set
Instruction manual
1 set
5 Introduction for Gateway
5.1 Interface
5.1.1 Diagram of Interface Function
Fig. 5.1 Schematic of protocol gateway interfaces of multi VRF unit

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5.1.2 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.
5.1.3 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.
5.2 LED Display
As shown in the picture below, open the black transparent front panel.
Fig 5.2 Schematic diagram of opening the black transparent board

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Indicators, buttons and DIP switch are as shown below.
Fig 5.3 The schematic diagram of the gateway LED light board and DIP switch
The above LED indicator is mainly consist of two parts: status indicator (run,
power) and communication indicator (CAN and RS485). The following table is the
working status of each indicator.
CAN RX
When receiving the data of equipment (eg. AC unit) which
connects to gateway, it blinks.
TX
When transmitting data to the equipment (eg. AC unit) which
connects to gateway, it blinks.
RS485-1
RX
When the gateway receives data on the 485 bus, it blinks.
TX
When the gateway sends data to the 485 bus, it blinks.
RS485-2
RX
This device does not use this LED indicator.
TX
This device does not use this LED indicator.
STAT
When power supply of Gateway is normal, it is on.
BEAT
When Gateway is running normally, it blinks.
BACKUP
This device does not use this LED indicator.
5.3 Button
SHT/DWN
When the fourth digit of DIP switch code is “1”, hold the
button for 5s and all indicators will be on. Reset the gateway
controller.
BACKUP
Not use this button for this device temporarily.
5.4 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.

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5.4.1 Diagram of Dial-up Machine
5.4.2 The 1st Lever of Functional DIP Switch—CAN2 Bus Matched
Resistance Setting
NOTICE! 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 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.

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Fig. 5.4 Gateway access CAN2 network matching resistance setting
Fig. 5.5 Schematic of dial code
5.4.3 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.
Fig. 5.6 Schematic of dial code

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5.4.4 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, gateway name or gateway ID from the webpage, and the webpage can’t
be accessed, user can reset the gateway to restore factory default information. Dial
the fourth digit of the DIP switch code to “1”, hold SHT/DWN button for 5s to restore
the default information of factory setting of the gateway.
6 Application
6.1 Building Management System (BMS)
This gateway has provided Modbus RTU, Modbus TCP and BACnet standard
protocols, which can connect to building management system (BMS). Realizing the
monitoring of Gree units of CAN bus by building management system through
gateway.
6.2 Internet Topological Graph
Fig. 6.1 Network topology for communication method of Modbus RTU

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Fig. 6.2 Communication method of BACnet and communication method network
topology of Modbus TCP
Internet topological graph statement:
485 bus: L1 shown in Fig. 6.1 is 485 bus, one 485 bus can connect to 254
gateways at most.
Network table: L1 shown in Fig. 6.2 is general network cable, the gateway can
connect to BMS via the network cable.
CAN1 network: L3 shown in Fig. 6.2 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. 6.2 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.

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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.
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.
7 Product Installation
7.1 Product Size and Spatial Size for Electric Control Cabinet
Installation
7.1.1 Product Size
Fig. 7.1 Gateway product size chart
Notice for installation and operation:
（1）Ensure the specification of power input. Otherwise, Gateway can’t work
normally or even be damaged.
（2）Ensure the dial code setting of Gateway is correct. Otherwise, there will
be communication malfunction.

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（3）Ensure that the communication cord has connected to the correct
interface. Otherwise, there will be communication malfunction.
（4）Do not place Gateway in direct sunlight or high-temperature and humid
environment. Place it in the central control cabinet.
7.1.2 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).
Fig. 7.2 Gateway installation guide
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.
7.2 Gateway and BMS adopt Modbus RTU Protocol
Communication Connecting Method

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7.2.1 Material Selection for Communication Iine
Communication
system
Type of
material
Length
L (m)
Cable
diameter
(mm²)
Material
Standard
Remarks
Communication
between
gateway and
BMS via
Modbus
Shielding
light/general
PVC jacket
twisted pair
L≤800 ≥2×0.75
IEC
60227-
5:2007
When the
communication
distance
exceeds 800m, a
PV isolation
relay should be
added.
7.2.2 Communication Connection Method
NOTICE!All communication connection lines under Gateway must be in series
connection, star connection shall not be adopted.

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Fig. 7.3 Schematic of connecting method of gateway
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.
Fig. 7.4 Installation of relay

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7.2.3 Setting of communication connection
RS485-1
R+ R-
(A1) (B1)
RS485-1
R+ R-
(A1) (B1)
①
②
③
Gateway
Gateway
Fig. 7.5 Connection between gateway and BMS via Modbus
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.
7.3 Gateway and BMS adopt Modbus RTU Protocol
Communication Connecting Method
7.3.1 Material Selection for Communication Iine
(1) Model selection of Gateway and BMS communication line shall use
standard Ethernet communication line, the length of network cable between
gateway and router (computer, switchboard, etc.) shall not exceed 80m

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(2) Communication line model selection for Gateway and AC unit
Wire type
L(m)Communication
line between
gateway and AC
units
Wire
diameter(mm2)
Wire
standard Remark
Light-
weight/normal
PVC jacket twisted
copper wire L≤ 500 ≥2×0.75 IEC
60227-
5:2007
Total
communication
length shall not
exceed 500m
7.3.2 Communication Connection Method
(1) Communication connection between Gateway and BMS
Fig. 7.6 Connecting method between gateway and router

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(2) Communication connection between Gateway and AC units (n is the
quantity of ODU system, n ≤ 16)
Fig. 7.7 Connecting method of gateway
NOTICE!All communication connection lines under Gateway must be in series
connection, star connection shall not be adopted.
7.3.3 Communication Connection Configuration
(1) Communication line connection between Gateway and PC:
Connection diagram between Gateway and PC user side:

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1) Adopt cross connection network cable, Gateway shall directly connect
to PC.
Fig. 7.8 Gateway connects to personal computer directly
2) Adopt parallel network cable, Gateway shall go through router to
connect to PC.
Fig. 7.9 Gateway connects to personal computer via router
(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
Fig. 7.10 Communication connection between gateway and unit