Cooper & Hunter Modbus Mini Operating instructions

MODBUS GATEWAY(MINI)
Installation & Owner`s manual
Modbus Gateway(Mini)
Model:
ME30-24/ E7(M)
Thank you for choosing Cooper&Hunter, please read this installation & owner`s manual carefully
before operation and retain it for future reference.

To Users
Thank you for selecting C&H’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
Cooper&Hunter Inc.

Content
1 Safety Notices (Please be sure to abide)................................................................1
2 User Notice .............................................................................................................2
3 General Functions...................................................................................................3
4 Composition............................................................................................................4
5 Detailed Introduction of Modbus Gateway(Mini)......................................................4
5.1 Interface...........................................................................................................4
5.2 LED Display.....................................................................................................7
5.3 DIP Switches....................................................................................................8
6 Application.............................................................................................................11
6.1 Building Management System (BMS) ............................................................11
6.2 Topological Graph..........................................................................................12
6.3 Topology Introduction.....................................................................................12
7 Product Installation................................................................................................14
7.1 Product Dimension and Installation Space of Electric Control Cabinet............14
7.2 Communication Connection...........................................................................16
8 Annex: DIPAddress...............................................................................................22

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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
thepeople.
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.

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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.
（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 resultin electric shock.
（
5
）
Do use the power cable specified in this manual; otherwise it would result in a fire
hazad.
（
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.

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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 communicationfault.
（4）After connection, lines should be protected with insulating tape to avoid
oxidation and short circuits.
（5）Normal working conditions for Modbus Gateway(Mini)：
a) Temperature : -20 ～+60℃;
b) Humidity: less than 85%, except for the condensation of dew;
c) Location: 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
C&H unitary unit series Modbus Gateway(Mini) provides standard Modbus RTU
protocol to realize data exchange between unitary unit and BMS.
The gateway is suitable for C&H Big Duct Type Unit and Air-Cooled Packaged
AHU . C&H unitary unit series Modbus Gateway(Mini) is called Modbus
Gateway(Mini) for short.

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4 Composition
The product contains following items.
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

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5.1.2 Power
The input power is 12V DC, external power supply can be prepared.
Note: pay attention to the polarity of power input and connect power according to the
interface instruction.

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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.
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).

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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. unitary unit)
connected with Modbus Gateway(Mini), it will flash.
RX When the data from the equipment (e.g. unitary unit) 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.

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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
Address DIP switch consists of S1 and S2. S3 is function DIP switch.

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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:

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Setting method of address 43 is shown as below:
5.3.3 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.
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.

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DIP switch of matched resistance is shown as below:
5.2.4 The 1st, 2nd and 4th Switch of Function DIP Switch S3 – Reserved
functional dial code place number
The 1st, 2nd and 4th of functional dialer is reserved functional dial code places.
The 1st and 2nd places have no functions yet. The 4th is the matching resistance dial
code of CAN bus, which is not available to this product yet.
6 Application
Modbus Gateway(Mini) is usually applicable for Building Management System.
6.1 Building Management System (BMS)
This gateway adopts Modbus RTU standard protocol .As the BMS interface,it
can connect C&H unitary series unit to the user Building Management System (BMS)
to realize the monitor of building management
System to C&H central air cinditioners.

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6.2 Topological Graph
6.3 Topology Introduction
Modbus bus:1
Modbus bus:L1 represents Modbus bus.
Unit:one set of unit consists of one set of outdoor unit and one set of indoor unit.

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Unit 1: Air-Cooled Packaged AHU.
Unit 2: Big Duct Type Unit.
CAN1 network: network of the unit shown in the figure is CAN1 network, which
consists of Modbus Gateway (Mini), outdoor unit and indoor unit; bus shown in L2 in
the network is CAN1 bus.
Connectable unit quantity of Modbus Gateway (Mini): one Modbus Gateway
(Mini) can only connects to one set of unit, that is, each unitary unit system needs a
single Modbus Gateway (Mini).
One Modbus network can connect to 255 Modbus Gateway (Mini) at most.

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7 Product Installation
7.1 Product Dimension and Installation Space of Electric Control
Cabinet
7.1.1 Product Dimension
Unit: mm

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7.1.2 Installation Dimension of Electric ControlCabinet
Modbus Gateway(Mini) shall be installed in the electric control cabinet. The front
side of gateway shall be hung upwards in horizontal level and secured by two screws.
Required installation space is shown as below (only for reference).

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Unit: mm
7.2 Communication Connection
Communication system of Modbus Gateway(Mini) includes:
（1）Communication between Modbus Gateway(Mini) and BMS;
（2）Communication between Modbus Gateway(Mini) and air conditioner.