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 mm 2  wire 

 

 

 RS485 

 3-pin terminal block max. 2.5 mm 2  wire 

 

 

 Power 

 3-pin terminal block max. 2.5 mm 2  wire 

 

 

 M-Bus 

 3-pin terminal block max. 2.5 mm 2  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