Gree H2M User manual

Owner's Manual
Original Instructions
H2M Gateway
Models:
ME31-33/EH1(M)

I
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) This instruction manual is a universal manual, some functions are only
applicable to particular product. All the illustrations and information in the
instruction manual are only for reference, and control interface should be
subject to actual operation.
(3) 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.

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(4) 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.
(5) The final right to interpret for this instruction manual belongs to Gree
Electric Appliances Inc. of Zhuhai.

III
Contents
1 SAFETY NOTICES (PLEASE BE SURE TO ABIDE)................................1
2 OPERATION NOTICES..............................................................................2
3 FUNCTIONS INTRODUCTION..................................................................3
4 PARTS........................................................................................................3
5 DETAILED INTRODUCTION......................................................................4
5.1 PORTS..............................................................................................................................4
5.2 LED DISPLAY....................................................................................................................5
5.3 DIP SWITCH .....................................................................................................................6
6 INSTALLATION........................................................................................12
6.1 DIMENSIONS AND INSTALLATION METHOD...............................................................12
6.2 COMMUNICATION CONNECTION ................................................................................14
APPENDIX A: ADDRESS TABLE OF DIP SWITCH ..................................21

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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.
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 air conditioner with anti-corrosive or anti-explosion function .

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2 Operation Notices
Notice!
(1) This appliance is powered by the indoor unit of air conditioner. Do not connect
other power source to this appliance, otherwise it may cause fire hazard and
damage the appliance.
(2) Before touching the electric components, please be sure the appliance is
disconnected to power.
(3) Never install the appliance in a damp place or allow it to be exposed to direct
sunlight.
(4) Never install the appliance near heat source or a place that may easily get
splashes of water.
(5) Please install the appliance in a place without electromagnetic interference or
dusty particles.
(6) Make sure that the communication wires are connected to the correct ports,
otherwise communication failure will occut and may damage the appliance.
(7) Once wires are connected, use insulative tape to protect the wires from
oxidation and short circuit.
(8) Working conditions for the appliance:
①Temperature: -20～+60℃;
②Relative humidity: ≤85%;
③Install it indoors (better to install it in an electric control cabinet), avoid direct
sunlight, rain and snow.
(9) All the graphics in the instruction manual are for reference only.

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3 Functions Introduction
Gree H2M Gateway can exchange data with air conditioners and the upper units
of Modbus. It provides standard Modbus RTU protocol.
This gateway is applicable for Gree Multi VRF Units (CAN Communication). The
upper units of Modbus can control the VRF indoor units (CAN Communication)
through H2M Gateway. One upper unit of Modbus can directly control one (or more)
indoor units.
Fig.3.1 Exterior Sketch of H2M Gateway
4 Parts
Please check whether the following items are all included before installation.
H2M Gateway
1 set
Instruction Manual
1 copy
Installation screw ST4.2X13MB
2 pieces

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5 Detailed Introduction
5.1 Ports
5.1.1 Diagram of Ports
Fig.5.1 Diagram of Ports

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5.1.2 Description of Communication Ports
HBS communication port: It is connected to the indoor unit of air conditioner
through a 2-core communication wire. It is used for the indoor unit to supply power to
H2M Gateway and communicate with H2M Gateway;
RS485 communication port: It is connected to Modbus through a 2-core
communication wire. It is used for the communication between H2M Gateway and the
upper unit of Modbus.
IO port: Reserved function port.
5.2 LED Display
The following table is a detailed description about the LEDs indicated in Fig.5.1.
POWER
It lights up if the power supply of H2M Gateway is normal.
HBS
TX
It will be blinking if H2M Gateway sends data to the indoor unit.
RX
It will be blinking if H2M Gateway receives data from the indoor
unit.
RS485
TX
It will be blinking if H2M Gateway sends data to Modbus.
RX
It will be blinking if H2M Gateway receives data from Modbus.
Note: If the gateway receives no data from Modbus for a long time, RX
indicator of RS485 will be blinking once every 6 seconds.

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5.3 DIP Switch
Attention! Before using this device, please set its DIP switch first; otherwise the
device will not work!
Gateway’s DIP switch is built within. Before setting, screw off the locating screws
on the sides of the gateway and then open the cover. The allocation of DIP switch is
shown below. It is combined with address DIP switch (S1&S2) and function DIP
switch (S3).

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5.3.1 Diagram of DIP Switch
As shown below, S1 and S2 refer to the address DIP switch while S3 refers to
the function DIP switch.
1 2 3 4 1 2 3 4 1 2
0
1
S1 S2 S3
5.3.2 Address DIP Switch—Modbus Device Address Setting
Set the gateway's Modbus device address through address DIP switch. Please
note that the address must not be identical with any other devices in the Modbus,
otherwise communication failure will occur. After changing a device address, restart
the gateway to enable the new address.
Address range of H2M Gateway: 1~255. Please refer to the Address table of DIP
Switch for specific switch codes.
For example:
The method of setting address 11 is as below:

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1234 1234
0
1
S1 S2
11010000
1 2 3 4 1 2 3 4 Addr
S1
Address Table of DIP Switch
S2
11

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The method of setting address 43 is as below:
1234 1234
0
1
S1 S2
1 1 0 1 0 1 0 0
12341234Addr
S1
Address Table of DIP Switch
S2
43

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5.3.3 The 1st Lever of Function DIP Switch –Master/Slave HBS
Device Setting
The 1st lever of function DIP switch S3 is used for the setting of master/slave
HBS device. After changing the setting of master/slave HBS devices, restart the
gateway to enable the new setting. For the connection method of master/slave HBS
device, please refer to Section 6.2.1.
In an HBS network, if H2M Gateway is the only device that is connected to
indoor units, it should be set as the master HBS device. Turn the 1st lever of function
DIP switch S3 to 1.
In an HBS network, if both the wired controller and H2M Gateway are connected
to indoor units, wired controller should be set as the master HBS device (i.e. master
wired controller, please refer to the instruction manual of wired controller for the
setting method). So H2M Gateway should be set as the slave HBS device. Turn the
1st lever of function DIP switch S3 to 0.
Diagram of DIP Switch Setting for Master/Slave HBS Device:
1 2
0
1
S3
Master
HBS Device
1 2
S3
Slave
HBS Device

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5.3.4 The 2nd Lever of Function DIP Switch –Modbus Matched
Resistance Setting
The 2nd lever of function DIP switch S3 is used for the setting of Modbus
matched resistance. For the method of connecting gateway to Modbus, please refer
to Section 6.2.2.
If H2M Gateway is at the end of Modbus, it should be set to be with matched
resistance. Turn the 2nd lever of function DIP switch S3 to 0;
If H2M Gateway is not at the end of Modbus, it should be set to be without
matched resistance. Turn the 2nd lever of function DIP switch S3 to 1.
Diagram of DIP Switch Setting for Matched Resistance:
1 2
0
1
S3
Without matched
resistance
1 2
S3
With matched
resistance

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6 Installation
6.1 Dimensions and Installation Method
6.1.1 Dimensions
Fig.6.1 Product Dimensions

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6.1.2 Installation Method
Once the gateway's DIP switch setting is finished, re-install the gateway's cover
and secure it with screws. Install the gateway in a proper place indoors. We
recommend installing it horizontally in an electric control cabinet, with its front facing
upward. Secure it with 2 installation screws.
Fig.6.2 Installation Means

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6.2 Communication Connection
The communication system of H2M Gateway includes:
(1) HBS Communication: Communication between H2M Gateway and indoor
units
(2) RS485 (Modbus) Communication: Communication between H2M Gateway
and the upper units of Modbus
6.2.1 HBS Communication Connection
(1) Selection of Communication Wire
Fig.6.3 Length of Communication Wire

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Wire material
type
Total length
of
communicati
on line L
(m/feet)
Wire size
(mm2/AWG)
Material
standard
Remarks
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤250m
(L≤820-1/5fe
et)
≥2×0.75 mm2
(≥2×AWG18)
IEC
60227-5:2007
①Total length of
communication line
can't exceed 250m
(820-1/5feet).
②The cord shall be
Circular cord (the
cores shall be
twisted together).
③Should be in
compliance with EN
55032, it is necessary
to use shielded wire.
(2) Communication Connection Method
There are 4 methods to connect gateway to the network of indoor units:

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Fig.6.5 One gateway and one wired
controller control one indoor unit
Fig.6.4 One gateway controls one
indoor unit