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iSMA-B-MG-IP User Manual


The iSMA-B-MG-IP device (meter gateway) has been created to convert data from Modbus RTU/ASCII and M-Bus protocols to corresponding TCP IP protocols (Modbus TCP IP and M-Bus TCP IP) and M-Bus UDP IP protocols. The iSMA-B-MG-IP meter gateway allows to use one type of these conversions or both at the same time, using the same Ethernet connection.

The iSMA-B-MG-IP allows to service up to 128 Modbus RTU/ASCII devices with unique addresses connected to a COM1 port and up to 60 M-Bus meters (with unique addresses) connected to an M-Bus interface. At the same time the iSMA-B-MG-IP can manage up to  2 M-Bus UDP IP clients, 4 M-Bus TCP IP clients, 4 Modbus TCP  IP clients, which means it can effectively manage 10 clients.

The figure below shows an example of a system with iSMA-B-MG-IP.

An example of Modbus TCP/IP to RS485 gateway and M-Bus TCP/IP to M-Bus gateway

Revision History

1.024 Jan 2017First edition
1.114 Dec 2017
  • Added new Modbus registers: HW version, MAC address;
  • Added RS485_BIASING bit in STOP_BITS registers;
  • Added possibility to deactivate RS485_BIASING in hardware version 2.5 and newer
  • Added new elements on built-in web page: HW version, RS485 biasing;
1.226 Oct 2018
  • Corrections of typing errors in the text
  • Added imperial unit of measure
1.315 Nov 2018Added M-Bus extended star and tree topology
1.411 Feb 2019
  • Added MBUS BAUD RATE (32-bits) registers
  • Added MBUS CONNECTION TIMEOUT (32-bits) registers
1.58 Jun 2020
  • Company data update
  • M-Bus UDP IP protocol update
  • Modbus function 0x17 read/write multiple registers
  • Modbus function 0x2B to read the VENDOR_NAME, MODEL_NAME, FW_VERSION, HOMEPAGE
  • Supporting Modbus address 0xFF for communication with gateway (IP module)
1.625 May 2022Rebranded
Revision history
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