ICP DAS USA GW-7828 User manual

User Manual
Version 1.0.0 Jan 2020
GW-7828
(Modbus RTU Slave to M-Bus Master Gateway)

GW-7828 (Modbus RTU Slave to M-Bus Master Gateway) User Manual Version 1.0.0 Page：2
Copyright © 2020 ICP DAS Co., Ltd. All Rights Reserved E-mail: serv[email protected]
Table of Contents
1. Introduction .........................................................................................................................5
1.1 Features..........................................................................................................................6
1.2 Specification....................................................................................................................7
2. Getting Started ....................................................................................................................8
2.1 LED Indicator..................................................................................................................9
2.2 Rotary Switch................................................................................................................10
2.3 DIP Switch ....................................................................................................................11
3. Configuration and Communicate test .............................................................................12
3.1 Connect.........................................................................................................................13
3.2 Baud Rate and Data Format Settings ...........................................................................14
3.3 M-Bus Meter Settings ...................................................................................................15
3.3.1 Import .....................................................................................................................16
3.3.2 Export.....................................................................................................................18
3.3.3 Add.........................................................................................................................19
3.3.4 Save .......................................................................................................................21
3.3.5 Delete.....................................................................................................................23
3.3.6 Delete All ................................................................................................................25
3.4 M-Bus Meter Communicate Test...................................................................................26
4. Meter Configuration Label Description...........................................................................27
4.1 Serial.............................................................................................................................28
4.2 Protocol.........................................................................................................................29
4.3 Address.........................................................................................................................30
4.4 Medium.........................................................................................................................31
4.5 Value.............................................................................................................................32
4.6 Unit ...............................................................................................................................33
4.7 Cycle.............................................................................................................................34
4.8 Description....................................................................................................................35
4.9 Register.........................................................................................................................36

GW-7828 (Modbus RTU Slave to M-Bus Master Gateway) User Manual Version 1.0.0 Page：3
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Appendix A. Firmware Update ................................................................................................37
Appendix B. Revision History.................................................................................................38

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：4
Copyright © 2020 ICP DAS Co., Ltd. All Rights Reserved E-mail: se[email protected]m
Important Information
Warranty
All products manufactured by ICP DAS are under warranty regarding
defective materials for a period of one year, beginning from the date of
delivery to the original purchaser.
Warning
ICP DAS assumes no liability for any damage resulting from the use of this
product.ICP DAS reserves the right to change this manual at any time
without notice. The information furnished by ICP DAS is believed to be
accurate and reliable. However, no responsibility is assumed by ICP DAS
for its use, not for any infringements of patents or other rights of third parties
resulting from its use.
Copyright
Copyright @ 2020 by ICP DAS Co., Ltd. All rights are reserved.
Trademark
Names are used for identification purpose only and may be registered
trademarks of their respective companies.
Contact us
If you encounter any problems while operating this device, feel free to contact us
via mail at: servi[email protected]om . We will reply as soon as possible.

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：5
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1. Introduction
The M-Bus ("Meter-Bus") is a standard for remote reading of meters. It is usable for most
types of consumption meters as well as for various sensors and actuators. The GW-7828 is
specially designed for M-Bus slave device. It offers Modbus RTU communication by three
kinds of interface, RS-232, RS-422 and RS-485. On hardware the GW-7828 has two rotary
switches for serial port and M-Bus port baud rate. GW-7828 supports Modbus RTU function
code 0x03 and 0x04 to read data of M-Bus meters. Through this design, it is easy to
communicate with any standard M-Bus slave.

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1.1 Features
Supports M-Bus standard: EN-13757, CJ/T -188
Supports Modbus RTU function code 0x03 and 0x04 to read Meter data
Baud rate: Adjustable by rotary switch serial port from 300 to 115200 bps, and
M-Bus from 300 to 2400 bps. Two baud rates are set individually.
Default serial port data format: Data bit 8, Parity None, Stop bit 1
Default M-Bus port data format: Data bit 8, Parity Even, Stop bit 1
Supports up to 100 M-Bus slaves
M-Bus over current protection
Short-circuit protection on the M-Bus
Update firmware from serial port
Provides PWR, MTX and MRX 3 LED indicators
Watchdog inside

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1.2 Specification
Module GW-7828
M-Bus Interface
Channel 1
Baud Rate (bps) 300 bps ~ 2400 bps
Data bit 5, 6, 7, 8
Stop bit 1, 2
Parity None, Even, Odd, Space, Mark
Isolation 3750 Vrms for photo-couple
ESD Protection Contact ±4 kv class B
Current Protection short-circuit protection
UART Interface
Channel 1 RS-232 / RS-422 / RS-485 (can't be used simultaneously)
Baud Rate (bps) 300 bps ~ 115200 bps
Data bit 5, 6, 7, 8
Stop bit 1, 2
Parity None, Even, Odd, Space, Mark
ESD Protection Contact ±4 kv class B
Power
Power Supply Unregulated +10 ~ +30 VDC
Protection Power reverse polarity protection, Over-voltage brown-out protection
Power Consumption
1.8 W @ 24 VDC (with 1 slave device)
11.8 W @ 24 VDC (with 100 slave devices)
Mechanical
Installation DIN-Rail
Dimension (W x L x H) 72mm x 122mm x 33mm
Environment
Operating Temperature -25 to +60°C
Storage Temperature -40 to +80°C
Relative Humidity 10 to 90% RH, Non-condensing

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2. Getting Started
Appearance and pin assignments

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2.1 LED Indicator
The GW-7828 module provides three LED indicators, including indicators for power status and
module status. The Following is an overview of the purpose and function of each LED indicator
together with a description.
LED Name
LED
Status
LED Description
Power (Yellow) ON The power of the module is ON
Power (Yellow) Flashing
M-Bus overload (short or too much M-Bus slaves)
Need reboot to recover the status.
MTX (Green) Flashing M-Bus communication normal Tx
MRX (Green) Flashing M-Bus communication normal Rx
*

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2.2 Rotary Switch
The GW-7828 module provides two rotary switches that are used to change UART Baud Rate
and M-Bus Baud Rate. The following is an overview of the purpose and function of each rotary
switch position together with a description.
Note: M-Bus only supports baud rate from 300 to 2400 bps.
Switch
Baud rate (bps)
Format
0
300
M-Bus Port:8,e,1
Serial Port:8,n,1
1
600
2
1200
3
2400
4
4800
5
9600
6
19200
7
38400
8
57600
9
115200
A~F
User defined
User defined

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：11
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2.3 DIP Switch
The DIP switch is used to update firmware and configure M-Bus Meter setting. The functions of
each mode will be explained in detail in later chapters. After changing the configuration of the
DIP switch, the GW-7828 needs to reboot to enable the new setting.
Init Pin
Mode Pin
Description
OFF
OFF
Operation Mode
OFF
ON
Configure Mode
ON
OFF
Firmware Update Mode
ON
ON
Reserved

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：12
Copyright © 2020 ICP DAS Co., Ltd. All Rights Reserved E-mail: se[email protected]m
3. Configuration and Communicate test
The configuration for the module parameters or communication setting on the GW-7828 module
can be performed via M-Bus utility. The M-Bus utility can be downloaded from the following
website:
http://ftp.icpdas.com.tw/pub/cd/fieldbus_cd/mbus/gateway/gw-7828/software/
The figure below is an illustration of module wiring. Connect the PC COM port to the RS-232 port
and connect M-Bus meter to M-Bus port of the GW-7828. Set the DIP switch to the configuration
mode and then power it on.

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：13
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3.1 Connect
Execute the M-Bus utility. There will be a connection diagram as first.
Click “Configure” tab page, choose the corresponding COM port in PC then click “Connect”
button to connect with module. Please be noted that the UART baud rate of GW-7828 will be
115200bps when it is in configuration Mode.

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：14
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3.2 Baud Rate and Data Format Settings
The first page of the utility lists baud rate and data format configuration of the serial port and the
M-Bus port and it also shows the Modbus RTU node ID of the GW-7828. User could add a new
baud rate and data format setting as need in this page.
Note: The GW-7828 only supports 300 bps ~ 2400 bps baud rate currently.

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：15
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3.3 M-Bus Meter Settings
In the “Meter” page of the utility, user could configure the M-Bus communication setting by using
“Import” or “Add” functions. The usages of these functions are listed as following sections.

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3.3.1 Import
There are two ways to add M-Bus Meter setting into GW-7828. One is using “Import” to import
an existed configuration file and save to GW-7828. The configure steps are as following:
Step1: Press “Import” button.
Step2: Open an existed configuration file of XML format.
Step3: The configuration will be loaded into the utility as following:

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：17
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Step4: Press “Save” button and confirm to save configuration.
Step5: After saving success diagram showed, set the DIP switch to operation mode and reboot
the module.

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：18
Copyright © 2020 ICP DAS Co., Ltd. All Rights Reserved E-mail: se[email protected]m
3.3.2 Export
User could export the existed module configuration to a XML file by the “Export” function.
Step1: Press “Export” button. Then select path and input file name to export the configuration.

GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual Version 1.00 Page：19
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3.3.3 Add
The second way to add meter configuration to GW-7828 is using “Add” function. The “Add”
function can add meter of EN-13757 protocol or CJ/T-188 protocol into GW-7828. Refer below
operation example for detail setting step.
Step1: Press “Add” button and select the protocol of the meter. There are two protocols,
EN-13757 and CJ/T188 for select. Input the meter serial number and M-Bus network polling
cycle time. Then press “OK” to connect to the meter.
Note: The meter serial number of EN-13757 is 8 numbers, and the serial number of CJ/T188 is
14 numbers.

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Step2: The meter information shows as below.
Step3: After add all meters on the utility list, press “Save” to save these parameters to the
GW-7828.