OPTOMA OP-H4v4 DIN Rail M-Bus Level Converter with RS-232/RS-485, 24V AC/DC, up to 20 M-Bus Slaves

M-Bus level converter that galvanically isolates and bridges up to 20 M-Bus slave devices to RS-232 or RS-485 control systems, all from a compact DIN rail module. The OPTOMA OP-H4v4 delivers reliable data exchange between energy meters and building management platforms with a wide 24V AC/DC supply and DIP-switch configuration for effortless setup.

Advantages

This module simplifies the connection of M-Bus meters to modern control networks. Its DIN rail form factor allows for quick installation in electrical cabinets, while the wide input voltage range and low power consumption ensure reliable operation in various environments. The inclusion of DIP switches for baud rate and termination configuration makes setup straightforward without additional software.

Suitable for

• M-Bus based energy metering (heat, water, gas, electricity)
• Building automation and smart metering projects
• Integration of M-Bus devices with RS-232 or RS-485 controllers
• Industrial and commercial facility management

Key specifications

• M-Bus slave capacity: up to 20 devices
• Interfaces: M-Bus master, RS-232, RS-485
• Power supply: 24 V AC/DC
• Power consumption: less than 3 W
• Galvanic isolation between M-Bus, serial and power lines
• DIN rail mounting (35 mm)
• Operating temperature: -20°C to +55°C
• Storage temperature: -25°C to +70°C
• LED indicators for power and data activity

Recommendations

When integrating the OP-H4v4, ensure the M-Bus polarity is correct and that the total cable length and number of slaves do not exceed the specified limits. Use the DIP switches to match the baud rate of the connected M-Bus and serial devices, and enable RS-485 termination only if the converter is at the end of the bus.