Metz Connect MR-DI4 Modbus RTU

Installation

1. 1Mount the Metz Connect MR-DI4 on a DIN TH35 rail inside the electrical distribution cabinet.
2. 2Wire the potential-free contacts or voltage inputs to the four digital input terminals of the module.
3. 3Set the Modbus address and baud rate (default 9600) using the two rotary switches on the front panel, or configure them via the Mbus configuration tool.
4. 4Connect the RS-485 A and B lines from the MR-DI4 to the Modbus RTU port on your ModbusCloud gateway (MCG or MLP series).
5. 5Import the Metz Connect MR-DI4 template in the ModbusCloud platform and assign the correct Modbus slave address.
6. 6Verify that all four digital input states appear correctly on the ModbusCloud dashboard before completing the installation.

Things to watch for

01

The gateway cannot communicate with the MR-DI4. What should I check?

Verify that the baud rate on the MR-DI4 matches the gateway setting, which should be 9600 by default. Also confirm the RS-485 A and B wiring is not swapped and that the configured Modbus slave address matches the template.

02

Can I use the MR-F-DI4 variant with this template?

Yes. Both the MR-DI4 and MR-F-DI4 are supported. The register map is identical, so the same template works for both models.

03

How do I change the Modbus address if the rotary switches are not sufficient?

Use the Mbus configuration tool provided by Metz Connect. This software allows you to set the module address, baud rate, parity, and sensor types via the Modbus connection itself.

04

Do I need a termination resistor on the RS-485 bus?

If the MR-DI4 is the last device on the RS-485 bus, a 120 ohm termination resistor should be placed across the A and B lines to prevent signal reflections.

Registers (4)

4 read / 0 write

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