Remote data retrieval from M-Bus devices via the RS485 serial communication line in industry and building automation. The most frequently used M-Bus slave devices are heat, water and electricity consumption meters.

The RS485toMBus-4M converter provides a RS485 to M-Bus interface conversion. There is no change in the content of the messages or communication speed during the conversion. The maximum number of M-Bus slave devices that can be connected is five.

M-Bus port

• Connection of 1 to 4 M-Bus slave devices.
• Surge protection guaranteeing superior durability against overvoltage.
• Current protection against overload and short circuit on the communication line with
  LED status indication.

Power supply

• Wide range of DC power supply voltage 7-28V.
• Overvoltage protection.
• LED indication of power supply.

RS485

• Signals: Data+, Data- and GND
• Protections against overvoltage.
• Selectable termination of the line with a 120R resitor.
• Galvanic separation from the M-Bus line.

Mechanical construction

• Plastic box with mounting on 35 mm DIN rail.

• Connection of 4 M-Bus slave devices.
• Smaller width on the DIN rail.
• Less powerful overvoltage protections on the M-Bus line and the power port.
• The power supply port does not have galvanic separation from the RS485 communications port.
• Only DC power supply.
• Less powerful M-Bus line driver. The maximum length of the M-Bus line is in the range of hundreds of meters.
• Smaller operating temperature range.

• Each converter passes through several functional electrical tests during the production.

  Additionally a communication test is performed after final assembly.

• EMC certification in an accredited laboratory for industrial environment.
• Solid design and construction based on many years practical experience.