GW-7838-M (Modbus TCP Server to M-Bus Master Gateway) User Manual
Version 1.01
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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-7838-M
is specially designed for M-Bus slave device. It offers Modbus TCP communication by
Ethernet and Modbus RTU communication by RS-232. On hardware the GW-7838-M has a
6-bit dip switch for serial port and M-Bus port baud rate. GW-7838-M supports Modbus
TCP/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.
