Gree ME30-24/E6 User manual

Modbus Gateway(Mini)
model:
ME30-24/E6(M)

To Users
Thank you for selecting Gree’s product. Please read this instruction manual
carefully before installing and using the product, so as to master and correctly use
the product. In order to guide you to correctly install and use our product and
achieve expected operating effect, we hereby instruct as below:
(1) This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction concerning
use of the appliance by a person responsibility for their safety. Children should
be supervised to ensure that they do not play with the appliance.
(2) In order to ensure reliability of product, the product may consume some power
under stand-by status for maintaining normal communication of system and
preheating refrigerant and lubricant. If the product is not to be used for long, cut
off the power supply; please energize and preheat the unit in advance before
reusing it.
(3) Please properly select the model according to actual using environment,
otherwise it may impact the using convenience.
(4) This product has gone through strict inspection and operational test before
leaving the factory. In order to avoid damage due to improper disassembly and
inspection, which may impact the normal operation of unit, please do not
disassemble the unit by yourself. You can contact with the special maintenance
center of our company if necessary.
(5) For personal injury or property loss and damage caused by improper operation
such as improper installation and debugging, unnecessary maintenance,
violation of related national laws and rules and industrial standard, and violation
of this instruction manual, etc., we will bear no liability.

(6) When the product is faulted and cannot be operated, please contact with our
maintenance center as soon as possible by providing the following information.
1) Contents of nameplate of product (model, cooling/heating capacity, product
No., ex-factory date).
2) Malfunction status (specify the situations before and after the error occurs).
(7) All the illustrations and information in the instruction manual are only for
reference. In order to make the product better, we will continuously conduct
improvement and innovation. We have the right to make necessary revision to
the product from time to time due to the reason of sales or production, and
reserve the right to revise the contents without further notice.
(8) The final right to interpret for 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 General Functions ............................................................................... 3
4 Composition....................................................................................... 3
5 Detailed Introduction of Modbus Gateway(Mini) ......................................... 4
5.1 Interface ...................................................................................... 4
5.1.1 Interface Function Drawing .......................................................4
5.1.2 Power .................................................................................. 4
5.1.3 Communication Interfaces ........................................................5
5.2 LED Display..................................................................................6
5.3 DIP Switches ................................................................................7
5.3.1 Setting of Address DIP Switch ................................................... 7
5.3.2 Address DIP Switch S1,S2—Address Setting of Modbus
Gateway ....................................................................... 8
5.3.3 The Fourth Switch of Function DIP Switch S3 - Setting of CAN2 Bus
Matched Resistance........................................................9
5.3.4 The Third Switch of Function DIP Switch S3 - Setting of Modbus Bus
Matched Resistance...................................................... 10
5.3.5 The Second Switch of Function DIP Switch S3 - Setting of gateway
starting IDU project number ............................................ 11
6 Application....................................................................................... 12
6.1 Building Management System (BMS) ............................................... 12

6.2 Topological Graph ........................................................................ 13
6.3 Topology Introduction.................................................................... 13
7 Product installation ............................................................................ 15
7.1 Product Dimension and Installation Space of Electric Control
Cabinet ............................................................................ 15
7.1.1 Product Dimension................................................................ 15
7.1.2 Installation Dimension of Electric Control Cabinet ........................ 16
7.2 Communication Connection ........................................................... 17
7.2.1 Material Selection of Communication Cable................................ 18
7.2.2 Communication Connection Way ............................................. 18
7.2.3 Setting of Communication Connection....................................... 22
8 Annex: DIP Address........................................................................... 25

1
1 Safety Notices (Please be sure to abide)
Warning: If not abide strictly, it may cause severe damage to the
unit or the people.
Note: 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
product 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.
WARNING！
(1)Installation shall be performed by the qualified personnel; otherwise it would
result in a fire hazard or electric shock.
Modbus Gateway(Mini)

2
(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)Do install this device inside the electric control cabinet which is located indoor
and then is locked.
(8)Do install this device where it will not be subject to the electromagnetic
interference or heavy dust.
Notice！
(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.
Modbus Gateway(Mini)

3
(5)Normal working conditions for Modbus Gateway(Mini)：
①Temperature : -20 ～+60℃;
②Humidity: less than 85%;
③Location: indoor (it is highly recommended to install this product in the electric
control cabinet), not subject to direct sunlight, rain and snow etc.
(6)Graphics in the instruction manual are for reference only.
3 General Functions
Gree Modbus Gateway(Mini) is intended to realize the data exchange between
the air conditioner and BMS, and provides standard Modbus RTU protocol.
This gateway is applicable for DC Inverter GMV5, Water Source Heat Pump
GMV5, GMV5 Mini, GMV5 Slim and GMV5 Heat Recovery.
4 Composition
The product contains following items：
Modbus Gateway(Mini)

4
Modbus Gateway(Mini) 1 set
Owner’s Manual 1 set
5 Detailed Introduction of Modbus Gateway(Mini)
5.1 Interface
5.1.1 Interface Function Drawing
5.1.2 Power
The input power is 12V DC, external power supply can be prepared.
Modbus Gateway(Mini)

5
Note: pay attention to the polarity of power input and connect power according to
the interface instruction.
5.1.3 Communication Interfaces
CAN communication interface: It is connected to air conditioner through two-
core connection wire, to realize communication between Modbus Gateway(Mini)
and air conditioner.
Modbus Gateway(Mini)

6
RS485 communication interface: It is connected to BMS through two-core
communication cable, to realize communication between Modbus Gateway(Mini)
and BMS or nearby Modbus Gateway(Mini).
5.2 LED Display
LED indicators shown in the above figure are divided into two parts: status
indicators (power) and communication indicators(CAN, RS485). Operation status
of each indicator is shown in the following table.
CAN
TX
When the data is transferred to the equipment (e.g. air
conditioner) connected with Modbus Gateway(Mini), it
will flash.
RX
When the data from the equipment (e.g. air conditioner)
connected with Modbus Gateway(Mini) is received, it will
flash.
RS485
TX When the data is transferred to the Modbus bus, it will
flash.
RX When the data from the Modbus bus is received, it will
flash.
Power When power supply of Modbus Gateway(Mini) is normal,
it will be always on.
Modbus Gateway(Mini)

7
5.3 DIP Switches
Notice! Please set DIP switches before using this gateway. Re-energize
the device after setting DIP switches.
Otherwise this device cannot operate normally!
Setting area of Modbus gateway DIP switch is located inside the product,
including address DIP switch and function DIP switch.
5.3.1 Setting of Address DIP Switch
(1) Address DIP switch consists of S1 and S2. S3 is function DIP switch.
Modbus Gateway(Mini)

8
5.3.2 Address DIP Switch S1,S2—Address Setting of Modbus
Gateway
Notice! Please set the address DIP switches before using this gateway.
The network DIP switch address of the same bus cannot be repeated, otherwise
communication error may happen.
Modbus Gateway(Mini) address setting range: 1~255. Detailed DIP value
please refer to the Address DIP Form.
Address setting example:
Setting method of address 11 is shown as below:
Modbus Gateway(Mini)

9
Setting method of address 43 is shown as below:
5.3.3 The Fourth Switch of Function DIP Switch S3 - Setting of
CAN2 Bus Matched Resistance
Notice!
Notice! Master outdoor unit or gateway of the system which is at the end of
CAN2 bus must be set as with the matched resistance, otherwise communication
will be abnormal!
The fourth switch of function DIP switch is used for setting the CAN2 bus
matched resistance of this gateway.
Modbus Gateway(Mini)

10
If the Modbus gateway is at the end of CAN2 bus, the gateway shall be set as
with the matched resistance, which means set the fourth DIP switch to 0;
If the Modbus gateway is not at the end of CAN2 bus, the gateway shall be set
as without the matched resistance, which means set this DIP switch to 1.
DIP switch of matched resistance is shown as below:
n is ODU system quantity, n≤16.
5.3.4 The Third Switch of Function DIP Switch S3 - Setting of
Modbus Bus Matched Resistance
Notice! The third switch of function DIP switch is used for setting the
matched resistance of this gateway in Modbus bus.
Modbus bus: Detailed meaning please refer to topology introduction.
The seventh switch of function DIP switch is used for setting the matched
resistance of this gateway in Modbus bus.
Modbus Gateway(Mini)

11
If the Modbus gateway is at the end of Modbus bus, the gateway shall be set as
with the matched resistance, which means set the third DIP switch to 0;
If the Modbus gateway is not at the end of Modbus bus, the gateway shall be set
as without the matched resistance, which means set this DIP switch to 1.
DIP switch of matched resistance is shown as below:
5.3.5 The Second Switch of Function DIP Switch S3 - Setting of
gateway starting IDU project number
Gateway starting IDU project number means the IDU range that this gateway
can be handled. The second switch of function DIP switch is used for setting the
gateway starting IDU project number.
Gateway starting IDU project number is 1: this gateway can handle the IDU with
project number from 1~128.
Gateway starting IDU project number is 129: this gateway can handle the IDU
with project number from 129~255.
Setting diagram of gateway starting IDU project number DIP switch:
Modbus Gateway(Mini)

12
6 Application
Modbus Gateway(Mini) is usually applicable for Building Management System.
6.1 Building Management System (BMS)
This gateway adopts Modbus standard protocol, which can be used as the
interface of BMS. It is applicable for DC Inverter GMV5, Water Source Heat Pump
GMV5, GMV5 Mini, GMV5 Slim and GMV5 Heat Recovery.
Modbus Gateway(Mini)

13
6.2 Topological Graph
6.3 Topology Introduction
Modbus bus: L1 shown in the figure is the Modbus bus.
Modbus Gateway(Mini)

14
CAN1 network: network ③shown in the figure is the CAN1 network, which is
consist of Modbus Gateway(Mini) and all IDUs and ODUs of the system. One
CAN1 network can be connected to maximum 80 IDUs. L3 shown in the network is
CAN1 bus.
CAN2 network: network①and ②shown in the figure is the CAN2 network,
which is consist of Modbus Gateway(Mini) and main control ODU of the system.
One CAN2 network can be connected to maximum 16 systems and 255 IDUs. If
the system quantity exceeds 16 sets or IDU quantity exceeds 255 sets, it shall be
divided into two CAN2 network. L2 shown in the figure is CAN2 bus.
System: One system consists of one set of outdoor unit (one set of outdoor unit
is a module group consisting of 1~4 modules, that is 1~4 outdoor units) and its
connected indoor units.
Connectable unit quantity of Modbus Gateway(Mini): one Modbus Gateway(-
Mini) can be connected to maximum 16 systems and 128 IDUs. If IDU quantity
exceeds 128 sets, two Modbus gateways are needed.
Modbus Gateway(Mini)

15
7 Product installation
7.1 Product Dimension and Installation Space of Electric
Control Cabinet
7.1.1 Product Dimension
Modbus Gateway(Mini)