METZ Connect MR-F-GW Modbus RTU/Modbus TCP gateway (1108300170)

Automation engineers integrating legacy Modbus RTU devices—sensors, meters, drives—into modern Ethernet-based control systems need a reliable bridge. The METZ Connect MR-F-GW Modbus Gateway converts Modbus RTU (RS-232/RS-485) to Modbus TCP, enabling seamless communication between field devices and PLCs, SCADA, or building management systems. Its compact DIN-rail housing and wide operating temperature range make it suitable for industrial cabinets, machine rooms, and distributed installations.

Key specifications

• Protocol conversion: Modbus RTU (Master/Slave) to Modbus TCP (Client/Server)
• 1x Ethernet port: 10/100Base-T(X), RJ45
• 1x serial port: RS-232/RS-485 selectable, 3-pin terminal block
• Serial baud rate: 1200 bps to 115.2 kbps
• Supports up to 32 Modbus RTU devices, 16 TCP client and 16 TCP server connections
• Power supply: 12-48 V DC, redundant input possible, max. 2.5 W
• DIN rail mount (35 mm), plastic housing, IP30
• Operating temperature: -40 °C to +75 °C
• Galvanic isolation: 1.5 kV between Ethernet and serial
• Web-based configuration

Why choose it

The MR-F-GW offers robust protocol conversion with galvanic isolation, protecting your network from ground loops and surges. Its wide power input range and redundant supply option ensure high availability in critical applications. The web interface simplifies setup, and the compact plastic housing saves space on the DIN rail.

Ideal use cases

• Retrofitting legacy Modbus RTU devices into Ethernet-based industrial networks
• Connecting energy meters, sensors, and actuators to building management systems
• Remote monitoring and control of distributed Modbus devices over TCP/IP
• Protocol bridging in machine building, process automation, and infrastructure

Good to know

The gateway operates as a Modbus RTU master or slave and Modbus TCP client or server, providing flexible integration. It supports up to 32 RTU devices, making it suitable for medium-sized networks. The device is designed for harsh environments with a temperature range of -40 °C to +75 °C and IP30 protection. Configuration is done via a web browser, eliminating the need for proprietary software.