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G20 - M-Bus to Modbus TCP/RTU Gateway (Ethernet, RS232/RS485)
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G20 - M-Bus to Modbus TCP/RTU Gateway (Ethernet, RS232/RS485)
- Intelligent gateway converting M-Bus meter data into Modbus TCP/RTU protocols.
Product Description
The Redisage G20 is a dedicated gateway designed to integrate utility meters (M-Bus standard) with building automation systems (Modbus TCP). Ideally suited for Energy Management Systems (EMS), it acts as a translator between the complex M-Bus protocol and the universal Modbus standard.
The device independently queries M-Bus meters and maps the retrieved data into Modbus Holding Registers, making them easily accessible to any PLC or SCADA via Ethernet. Key features:
• Input: M-Bus Master (supports heat/water/gas meters)
• Output: Modbus TCP (Ethernet) & Modbus RTU (RS485)
• Function: Automatic data mapping
• Power Supply: 12-30 VDC
• Configuration: Intuitive Web Interface
Technical Documentation
Datasheet (DTR): ⬇ Download G20 Datasheet
Knowledge Base: 🔗 doc.redisage.com
Brand
Symbol
G20
Producer code
5903949781557
Series
Warranty
Main data
Power voltage
12-30 V/DC
Power connector
Screw terminal
Wi-Fi
No
Work temperature range
-40°C to +75°C
Safety measures
ESD 4 kV / 8 kV
Burst
Surge
RF
M-Bus
Number of M-Bus Slave devices
up to 10
Channel capacity
up to 9600 bps
fluent
Isolation
3 kV/DC
Ethernet
Ethernet Interface
1x RJ45
WAN/LAN
2 kV Isolated
Speed
10/100 Base-T
Protocol
Modbus TCP
Modbus RTU
Serial Ports
Number of ports
1
Port type
1x RS232/RS485
Connector type
Screw terminal
Transmission speed
115200 bps
Data bits
7
8
Stop bits
1
2
Controll Bits
none
odd
even
Enclosure
Mounting
DIN Rail
Width in standard modules S (17.5 mm)
2,5 M
Width
40 mm
Height
56.4 mm
Length
98 mm
Ingress Protection Code
IP20
Standards and Certifications
Declarations of Conformity
CE
RoHS
EMC
LVD
Norms
61000-6-2 - Immunity standard for industrial environments
61000-6-4 - Emission standard for industrial environments
About G20
G20 – Bridging the Gap Between M-Bus and Modbus
The G20 M-Bus to Modbus Gateway solves one of the most common problems in building automation: integrating specialized metering devices into the central control system. M-Bus is excellent for reading meters but is rarely supported directly by PLCs. The G20 acts as an interpreter, autonomously polling heat, water, and electricity meters over the M-Bus interface and storing the data in its internal memory.
From the perspective of the BMS or SCADA system, the G20 behaves like a standard Modbus TCP Server (via Ethernet) or Modbus RTU Slave (via RS485). The system simply reads data from registers, without needing to know the complexity of M-Bus frames. The gateway configuration is performed via a user-friendly Web Server, allowing you to scan the M-Bus network, select variables, and assign them to Modbus registers in minutes.
This device handles the physical power supply for the M-Bus network (built-in level converter) and ensures galvanic isolation between the metering section and the Ethernet network.
Technical Specifications:- M-Bus Interface: Master (powers the bus).
- Modbus Interface: TCP (Ethernet) & RTU (RS485).
- Configuration: Web Browser (No external software needed).
- Features: M-Bus Scanner, Automatic Register Mapping.
- Isolation: 1kV Galvanic Isolation.
Simplify your energy monitoring projects with the G20. Detailed mapping guides are available in the manual.
3 Year Warranty
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