GW-7828 (Modbus RTU Slave to MBus Master Gateway) User Manual
Version 1.00
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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-7828 is
specially designed for M-Bus slave device. It offers Modbus RTU communication by three
kinds of interface, RS-232, RS-422 and RS-485. On hardware the GW-7828 has two rotary
switches for serial port and M-Bus port baud rate. GW-7828 supports Modbus 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.