Modbus TCP/RTU M-Bus Gateways

• Data Sheet
• User Manual
• Configuration by the Web Page
• Configuration by the Telnet Console
• Configuration by the Serial Console
• Contact Us

Data Sheet

Modbus TCP/RTU M-bus Gateways (G20, G30)

G20 G30

Features Serial ports RS232 and RS485 Up to 10 simultaneously connected M-Bus slave devices ESD protection for the RS232/RS485 data line 1000 VDC isolation protection Power supply: +12 to +30 VDC or 24 VAC M-Bus Transmission speed up to 9600 bps Fast Ethernet 10/100 Mb/s Wi-Fi® 802.11b/g/n 150 Mbps / 2.4 GHz (G30 only) Tx, Rx and power LED indicators RS485 embedded termination 120 Ω Operating temperatures: -40°C to +75°C DIN-rail mounting Dimensions: 90 x 56,4 x 40 [mm] 3 years warranty Customization of OEM is welcomed

Introduction

The G20 and G30 are reliable M-Bus to Modbus gateways. They enable seamless integration between M-Bus slave devices and Modbus-based systems. On the M-Bus side, the gateway communicates in master mode and supports up to 10 simultaneously connected slave devices. On the Modbus side, the collected data is made available via the Modbus protocol, ensuring easy and efficient integration with PLCs, SCADA systems, or building automation. Dedicated EMC integrated circuits guarantee stable operation and improved communication quality by reducing interferences typical of industrial environments.

Specifications

Redisage PN		G20	G30
Converter ports	Serial	1 x active RS232/RS485
	M-Bus	1 x M-Bus master with up to 10 x slaves
Microcontroller		ESP32
Wi-Fi		N/A	802.11 b/g/n
Power	Voltage	12-30 VDC
	Power	< 1 W
Frame ground connection		yes
Serial interface	RS232	TxD, RxD, GND
	RS485	A, B
	M-Bus	MBus+, MBus -
Baud rate		up to 9600 bps
LED indicators		communication Tx, Rx, power
		RS232 OK
RS485 termination		120 Ω manually enabled
1000 VDC isolation side		RS232/RS485
Connector	RS232	3-pin terminal block max. 2.5 mm2 wire
	RS485	3-pin terminal block max. 2.5 mm2 wire
	Power	3-pin terminal block max. 2.5 mm2 wire
	M-Bus	3-pin terminal block max. 2.5 mm2 wire
	Ethernet	RJ45 Fast Ethernet 10/100 Mb/s
	2.4G Antenna	SMA, External Antenna included (G30 only)
Transmission distance	RS485	max. 1,200 m at 9.6 kbps; max. 400 m at 115.2 kbps (Belden 9841 2P twisted-pair cable, if different cables are used, the transmission distance may change)
	RS232	max. 15 m at 115.2 kbps
	M-Bus	see: M-Bus max. transmission distance (below)
Mounting and enclosure		DIN rail, plastic PA - UL 94 V0, black/green
Temperatures		-40°C to +75°C operating and storage
Humidity		10 - 90% RH, non-condensing
ESD protection		±4 kV contact discharge / ±8 kV air discharge
Certification		CE, RoHS, EMC, LVD, RED
Norms		61000-6-2 - Immunity standard for industrial environments 61000-6-4 - Emission standard for industrial environments	61000-6-2 - Immunity standard for industrial environments 61000-6-4 - Emission standard for industrial environments EN 300 328 – Data transmission equipment operating in the 2,4 GHz band

M-Bus max. transmission distance

Frame ground FG

Electronic circuits are constantly prone to electrostatic discharge ESD. Redisage Electronics modules feature a design for the frame ground terminal block FG. The frame ground provides a path for bypassing ESD, which provides enhanced static protection ESD abilities and ensures the module is more reliable. Connecting FG terminal block to the earth ground will bypass the ESD disturbances outside the device so will provide a better level of protection against ESD.

Frame Ground FG connection reference drawing is provided below.

If earth ground is not available, FG can be left floating, or it can be connected with the power supply GND.

Variants

G20 - M-Bus to Modbus Gateway (1x RS232/RS485)

G30 - M-Bus to Modbus Gateway (1x RS232/RS485) + Wi-Fi®

In the G20 and G30 gateways, user should use only RS232 or only RS485 interface of one port as they occupy the same internal bus of the device. It means, don't use RS232 & RS485 at the same time!

LED indicators

G20	G30

M-Bus to Modbus gateways G20 & G30 have 6 LED indicators:

• RX LED - Receiving data
• TX LED - Transceiving data
• PW LED - Power (M-Bus Converter)
• PW LED Blue - Power (Gateway)
• ETH LED Green - Network activity 
• ST LED Orange - USB-UART Serial console mode

Pin assignments

G20	G30

Additional notes

Wi-Fi® is a registered trademark of Wi-Fi Alliance®.

Related information and links
Ordering information	Accessories	Similar products

Products family sample photo

https://redisage.com

DISCLAIMER NOTES
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.

Datasheet-ID: 

SR-D

User Manual

Configuration by the Web Page

Modbus TCP/RTU M-bus Gateways (G20, G30)

This page presents capabilities of the Converters configuration. First, make sure that the converter is connected to the power supply and to the LAN using a patchcord or wireless via Wi-Fi. If the device has no static IP set up, it will be necessary to obtain its IP address in the local network. User interface is mostly similar for all gateways, but some subpages might be different for several models depending on amount of interfaces. In order to avoid issues, click on a “Help” button in the top right corner on every page.

Login

To access the web page, open the browser, type the device’s IP address of the converter (default is 192.168.100.100). Then log in using user’s personal credentials. If it is a first configuration or the converter had a factory reset, use default login details (login: admin, password: admin123).

The configuration is available only if devices are connected to the same Local Area Network as the computer used for it.

Status page

After a successful login, there should be an insight to a list of available connections. If there is more than one connection, it is possible to sort them by ID, timestamp or status.

Changing username or password

After clicking “Edit User” under the user icon, it is possible to change the username or the password.

If login details were forgotten, it would be necessary to do a factory reset via a USB/UART converter and a serial console.

Ports configuration

Item		Description
MBUS Request Update Period		Choose M-BUS Request Update period.
MODBUS TCP Idle Time		Choose Modbus TCP Idle Time.
Mode	MBUS	Switch device's mode to M-Bus.
	MODBUS	Switch device's mode to Modbus slave.
Slaves		Type slave device address. Multiple addresses can be written in one field, e.g. 9;11;14-17;80.
Slaves Response Timeout		Type slave devices response timeout.
Baud Rate		Choose baud rate.
Parity		Type of parity.
Stop Bits		Number of stop bits.
Termination		Enable RS termination.

Make sure to save all the changes with “Save and Apply” button located on the bottom of the page.

Network settings

In this section, network settings can be changed according to target LAN parameters.

Item	Description
Hostname	Label that is assigned to the device.
Configuration Method	Enable/disable the DHCP server. If the DHCP server is disabled, the IP address of the device has to be set manually.
IP Address	IP address of the device.
Netmask	Netmask associated with the IP address.
Gateway	Gateway address currently used by the device.
DNS Address	Domain Name System used by the device.
MAC Settings	Allow setting the default MAC address or typing it manually.
MAC Address	Allow changing the physical address of the device.
Wi-Fi (G30 only)	Scan and choose your network. Click on chosen and type password.
HTTP Port	Determine the port of the control panel.
Telnet Port	Allow connection with the device via Telnet.
Modbus TCP Listening Port	Used as an entry point for new Modbus TCP connections.

It is possible to obtain dynamic IP address. Just switch configuration method from static IP to DHCP (automatic). This process may cause some issues with identifying converters in LAN unless there is access to the device which is responsible for allocating IP addresses.

Keep in mind that in case of changed IP address, user needs to type new IP in the address bar and log in again.

Make sure to save all the changes with “Save and Apply” button located on the bottom of the page.

Device page

On the device page there are tools used to a firmware update, a factory reset and a device reboot. There are also some information about the device.

Item	Description
Firmware Update	Update firmware.
Factory Reset	Restore default ports settings and default network configuration.
Reboot	Reboot the device.
About	Basic information about the device.

Firmware update

The device firmware update must not be interrupted. Update the device only if experiencing issues, being instructed to do so by our support or requiring the latest features/bugfixes. Failure during the update may 'brick' the device and make it unusable.

Use the modbus-mbus-mcu-esp32.fir file for a firmware update.

Factory reset

To restore default settings, press the red button. After that, user will be asked to type “RESET”. Then it will take a few seconds to reload the web page and restart the device.  After reset, use default login details (login: admin, password: admin123; default IP: 192.168.100.100).

Configuration by the Telnet Console

Modbus TCP/RTU M-Bus Gateways (G20, G30)

The device can be also configured via the Telnet Console. Firstly, make sure that converter is connected to the power supply and to the LAN using a patch cord. Knowledge of the device’s IP address (default is 192.168.100.100) and Telnet port number (default is 23) is necessary to establish a connection.

Use command below in a terminal window to connect to the device:

If the connection is successful there will be login prompt visible. Login using user's personal credentials or the default login details (login: admin, password: admin123). If login is successful, it will be possible to start typing configuration commands.

The configuration is available only if devices are connected to the same Local Area Network as the computer used for it.

List of all commands

Command	Description
help	Print the help.
conn	Print active TCP connections.
net_stat	Print lwIP statistics.
eth_mac	Print or change MAC address.
wifi_mac	Print or change Wi-Fi MAC address
ipconfig	Print or change the network configuration.
http_port	Print or change default http port.
telnet_port	Print or change default telnet port.
modbus	Print or changes modbus settings.
ping	Check internet connection with the desired host.
defaults	Reset application variables to defaults
restart	Restart the system.
user	Print or change user configuration.
sys_heap_usage	Print current heap usage.
mbus	Print or changes M-Bus ports settings.
wificonf	Wi-Fi interface configuration
exit	Exit console.

Modbus ports configuration commands

• modbus
  • modbus help
    Print command help.
    
    
  • modbus tcp_port PORT_NUMBER
        Set modbus port to PORT_NUMBER. A PORT_NUMBER value must be in range:
          1-65535
        Example: modbus tcp_port 502
    
    
  • modbus tcp_port PORT_NUMBER
        Set modbus port to PORT_NUMBER. A PORT_NUMBER value must be in range:
          1-65535
        Example: modbus tcp_port 502
    
    
  • modbus idle_time TIME
        Set the timeout when waiting for the client's data [in miliseconds].
        A TIME value must be in range:
          0-4294967295
        Example: modbus idle_time 50000
    
    
  • modbus status
        Print current modbus tcp_port as well as idle_time.
        Example: modbus status
        A current tcp port is 502.
        A current idle time is 50000 [ms].

M-Bus ports configuration commands

• mbus {com_number} {subcommand} [arguments]
    Print or change mbus_ports configuration
    com_number - COM port number, as labeled in device's manual, to which mbus applies. This field is ignored for the                       subcommands 'period', 'availability' and 'help'
    subcommand - subcommand to execute
    arguments - subcommand parameters
  
  
  • mbus help
        Print current modbus tcp_port as well as idle_time
    
    
  • mbus mode [MBUS/MODBUS/DISABLED]
        Sets port mode.
        MBUS - Operates as an M-Bus master polling slave devices.
        MODBUS - Acts as a Modbus slave, providing access to MBUS register data.
    
    
  • mbus add_slaves [SLAVE_ADDR ;/- SLAVE_ADDR, *][]
        Sets all addresses of slaves connected to com_port.
        A star in value means fill rest free slaves. It means all slaves that    are not set to other ports will be set to this one.
        Example: mbus 1 add_slaves 124
        Example: mbus 1 add_slaves 12-124
        Example: mbus 1 add_slaves 12;14;18
        Example: mbus 1 add_slaves 12;14-17;150-200
        Example: mbus 1 add_slaves 12;14-17;150-200, *
    
    
  • mbus availability
        Lists the actually reachable slaves
        Example: mbus available
    
    
  • mbus show_slaves
        Show addresses of slaves connected to com_port
        Example: mbus 1 show_slaves
    
    
  • mbus baud [RATE]
        Sets the baudrate to RATE. For a list of acceptable baudrates please
        refer to manual.
        Example: mbus 1 baud 9600
    
    
  • mbus bits [PS]
        Sets parity to P and stop bits to S. Valid values are:
          P: N, E or O
          S: 1 or 2
        Example: mbus 1 bits N1
        Example: mbus 2 bits O2
    
    
  • mbus data
        Show data at desired address. 'com_number' is an address of MBUS slave
        Example: mbus 4 data
    
    
  • mbus period TIME
        Sets the period of readouts from the slaves to TIME [in seconds].
        A TIME value must be in range:
          1-4294967295
        Example: mbus period 30
    
    
  • mbus resp_to TIME
        Sets the response timeout to TIME [in miliseconds].
        A TIME value must be in range:
          0-65535
        Example: mbus 1 resp_to 30
    
    
  • mbus termination [on/off]
        Enable or disable termination on RS485 port
        Example: mbus 1 termination on

If a subcommand which normally sets a value is not given an argument, it will print the current value.
Example:
     #>mbus 2 baud
     Set baudrate is 9600

Network settings

The following commands might be helpful to change network settings according to target LAN parameters, 

• ipconfig
  • ipconfig addr ADDRESS
        Set IP address to ADDRESS.
    
        Example:
        ipconfig addr 192.168.0.10
    
    
  • ipconfig mask NETMASK
        Set subnet mask to NETMASK (in dot-decimal format).
    
        Example:
        ipconfig mask 255.255.255.0
    
    
  • ipconfig mask BIT_COUNT
        Set subnet mask to BIT_COUNT bits.
    
        Example:
        ipconfig mask 24
    
    
  • ipconfig gateway GATEWAY_IP
        Set network gateway to GATEWAY_IP.
    
        Example:
        ipconfig gateway 192.168.0.1
    
    
  • ipconfig dhcp [enable/disable]
        Enable or disable DHCP client.
    
        Example:
        ipconfig dhcp enable
    
  • ipconfig dns<num> ADDRESS
        Set DNS to ADDRESS, disable getting DNS from DHCP if enabled.
    
        Example:
        ipconfig dns1 192.168.100.1
  • ipconfig default_netif [NETIF_NAME]
        Sets interface as a default. If interface name is not given,
        displays current default interface.
        Example: default_netif e02
    

• http_port
  • http_port help
        Print the help message.
    
    
  • http_port PORT_NUMBER
        Set http port to PORT_NUMBER. A PORT_NUMBER value must be in range: 1-65535.
    
        Example:
        http_port 80
    
    
  • http_port status
        Print current http port.
    
        Example:
        http_port status
        A current http port is 80
    
    
• telnet_port
  • telnet_port help
        Print the help message.
    
    
  • telnet_port PORT_NUMBER
        Set Telnet port to PORT_NUMBER. A PORT_NUMBER value must be in range: 1-65535.
    
        Example:
        telnet_port 23
    
    
  • telnet_port status
        Print current Telnet port.
    
        Example:
        telnet_port status
        A current telnet port is 23

Changing username or password

To change username or password, use user command. Available commands:

• user help
  Print the help message.
  
  
• user mod_name USER_NAME NEW_NAME
  Change the user name to NEW_NAME. It fails if the name is used by another user.
  
  Example:
  user mod_name admin NEW_NAME
  
  
• user passwd USER_NAME
  Change USER_NAME's password.
  
  Example:
  user passwd admin
  ****** <- here is entered password, but '*' appears instead
  
  Note: Everyone can change the password for themselves.

  

Additional notes

After some time of inactivity, session will be disconnected automatically.

In order to avoid issues like connecting to host, type “help” to get more information.

To get more details about every particular command, append “help” after each commands (example: "ipconfig help").

Factory reset is not available from the Telnet Console level.

Configuration by the Serial Console

Modbus TCP/RTU Gateways (G20, G30)

Another way to configure the device is via a serial console. In case of the G11 - G13 Modbus gateways an additional USB/UART converter is needed.

Procedure to enter serial console mode

• Turn off the power of the device.
• Connect Ethernet converter to the dedicated USB/UART converter via the microUSB port (for example our C38 converter).
• Connect the USB/UART converter to the PC.
• Open the serial console (default baud rate is 115200 bps).
• Short the FG and GND ports.
• Turn on the power.
• Wait until the ST indicator (orange LED) lights up (it should light up after red light - service mode).
• Open the the FG and GND ports.
• Login using user’s personal credentials or default login details.
• If the process is successful, configuration command can be typed into the terminal.

List of all commands

Command	Description
help	Print the help.
conn	Print active TCP connections.
net_stat	Print lwIP statistics.
eth_mac	Print or change MAC address.
wifi_mac	Print or change Wi-Fi MAC address
ipconfig	Print or change the network configuration.
http_port	Print or change default http port.
telnet_port	Print or change default telnet port.
modbus	Print or changes modbus settings.
ping	Check internet connection with the desired host.
defaults	Reset application variables to defaults
restart	Restart the system.
user	Print or change user configuration.
sys_heap_usage	Print current heap usage.
mbus	Print or changes M-Bus ports settings.
wificonf	Wi-Fi interface configuration
exit	Exit console.

Modbus ports configuration commands

• modbus
  • modbus help
    Print command help.
    
    
  • modbus tcp_port PORT_NUMBER
        Set modbus port to PORT_NUMBER. A PORT_NUMBER value must be in range:
          1-65535
        Example: modbus tcp_port 502
    
    
  • modbus tcp_port PORT_NUMBER
        Set modbus port to PORT_NUMBER. A PORT_NUMBER value must be in range:
          1-65535
        Example: modbus tcp_port 502
    
    
  • modbus idle_time TIME
        Set the timeout when waiting for the client's data [in miliseconds].
        A TIME value must be in range:
          0-4294967295
        Example: modbus idle_time 50000
    
    
  • modbus status
        Print current modbus tcp_port as well as idle_time.
        Example: modbus status
        A current tcp port is 502.
        A current idle time is 50000 [ms].

M-Bus ports configuration commands

• mbus {com_number} {subcommand} [arguments]
    Print or change mbus_ports configuration
    com_number - COM port number, as labeled in device's manual, to which mbus applies. This field is ignored for the                       subcommands 'period', 'availability' and 'help'
    subcommand - subcommand to execute
    arguments - subcommand parameters
  
  
  • mbus help
        Print current modbus tcp_port as well as idle_time
    
    
  • mbus mode [MBUS/MODBUS/DISABLED]
        Sets port mode.
        MBUS - Operates as an M-Bus master polling slave devices.
        MODBUS - Acts as a Modbus slave, providing access to MBUS register data.
    
    
  • mbus add_slaves [SLAVE_ADDR ;/- SLAVE_ADDR, *][]
        Sets all addresses of slaves connected to com_port.
        A star in value means fill rest free slaves. It means all slaves that    are not set to other ports will be set to this one.
        Example: mbus 1 add_slaves 124
        Example: mbus 1 add_slaves 12-124
        Example: mbus 1 add_slaves 12;14;18
        Example: mbus 1 add_slaves 12;14-17;150-200
        Example: mbus 1 add_slaves 12;14-17;150-200, *
    
    
  • mbus availability
        Lists the actually reachable slaves
        Example: mbus available
    
    
  • mbus show_slaves
        Show addresses of slaves connected to com_port
        Example: mbus 1 show_slaves
    
    
  • mbus baud [RATE]
        Sets the baudrate to RATE. For a list of acceptable baudrates please
        refer to manual.
        Example: mbus 1 baud 9600
    
    
  • mbus bits [PS]
        Sets parity to P and stop bits to S. Valid values are:
          P: N, E or O
          S: 1 or 2
        Example: mbus 1 bits N1
        Example: mbus 2 bits O2
    
    
  • mbus data
        Show data at desired address. 'com_number' is an address of MBUS slave
        Example: mbus 4 data
    
    
  • mbus period TIME
        Sets the period of readouts from the slaves to TIME [in seconds].
        A TIME value must be in range:
          1-4294967295
        Example: mbus period 30
    
    
  • mbus resp_to TIME
        Sets the response timeout to TIME [in miliseconds].
        A TIME value must be in range:
          0-65535
        Example: mbus 1 resp_to 30
    
    
  • mbus termination [on/off]
        Enable or disable termination on RS485 port
        Example: mbus 1 termination on

If a subcommand which normally sets a value is not given an argument, it will print the current value.
Example:
     #>mbus 2 baud
     Set baudrate is 9600

Network settings

The following commands might be helpful to change network settings according to target LAN parameters, 

• ipconfig
  • ipconfig addr ADDRESS
        Set IP address to ADDRESS.
    
        Example:
        ipconfig addr 192.168.0.10
    
    
  • ipconfig mask NETMASK
        Set subnet mask to NETMASK (in dot-decimal format).
    
        Example:
        ipconfig mask 255.255.255.0
    
    
  • ipconfig mask BIT_COUNT
        Set subnet mask to BIT_COUNT bits.
    
        Example:
        ipconfig mask 24
    
    
  • ipconfig gateway GATEWAY_IP
        Set network gateway to GATEWAY_IP.
    
        Example:
        ipconfig gateway 192.168.0.1
    
    
  • ipconfig dhcp [enable/disable]
        Enable or disable DHCP client.
    
        Example:
        ipconfig dhcp enable
    
  • ipconfig dns<num> ADDRESS
        Set DNS to ADDRESS, disable getting DNS from DHCP if enabled.
    
        Example:
        ipconfig dns1 192.168.100.1
  • ipconfig default_netif [NETIF_NAME]
        Sets interface as a default. If interface name is not given,
        displays current default interface.
        Example: default_netif e02
    

• http_port
  • http_port help
        Print the help message.
    
    
  • http_port PORT_NUMBER
        Set http port to PORT_NUMBER. A PORT_NUMBER value must be in range: 1-65535.
    
        Example:
        http_port 80
    
    
  • http_port status
        Print current http port.
    
        Example:
        http_port status
        A current http port is 80
    
    
• telnet_port
  • telnet_port help
        Print the help message.
    
    
  • telnet_port PORT_NUMBER
        Set Telnet port to PORT_NUMBER. A PORT_NUMBER value must be in range: 1-65535.
    
        Example:
        telnet_port 23
    
    
  • telnet_port status
        Print current Telnet port.
    
        Example:
        telnet_port status
        A current telnet port is 23

Changing username or password

To change username or password, use user command. Available commands:

• user help
  Print the help message.
  
  
• user mod_name USER_NAME NEW_NAME
  Change the user name to NEW_NAME. It fails if the name is used by another user.
  
  Example:
  user mod_name admin NEW_NAME
  
  
• user passwd USER_NAME
  Change USER_NAME's password.
  
  Example:
  user passwd admin
  ****** <- here is entered password, but '*' appears instead
  
  Note: Everyone can change the password for themselves.

  

Additional notes

After some time of inactivity, session will be disconnected automatically.

In order to avoid issues like connecting to host, type “help” to get more information.

To get more details about every particular command, append “help” after each commands (example: "ipconfig help").

Service mode

Entering the service mode is almost the same as entering the serial console. One different is to open FG and GND ports earlier (when the red LED is still blinking).

Available commands in the service mode:

Command	Description
help	Print the help.
credits	Print current credits value for this device.
dev_ident	Print the device identificator value.
restart	Restart the system.
serial_num	Print the serial number of this device.
version	Display the bootloader version.
xmodem	Download image to the internal Flash using xmodem.
defaults	Reset application variables to defaults.
ipconfig	Print or change the network configuration.
flash_read	Read bytes from flash memory.
md	Read bytes from memory address.

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