Instructions

Intesis

Modbus Server – M-Bus User Manual r1.4 EN

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2 M-Bus System

In this chapter, a brief description of functionality and features of M-Bus is provided.

Description

The M-Bus ("Meter-Bus") is a European standard for remote reading of heat meters and it is also usable for all other

types of consumption meters as well as for various sensors and actuators.

M-Bus standards are:

• EN 13757-2 (physical and link layer).

• EN 13757-3 (application layer).

Many manufacturers of energy meters, pulse counters, water meters, electricity meters, etc. add to their devices an

M-Bus interface, enabling them to be interconnected and remote measured through a 2-wire bus based on the

standards of M-Bus. There are many manufacturers of these measurement devices incorporating M-Bus interface

and also some other manufacturers of specific communication M-Bus devices like bus repeaters, EIA232/EIA485 to

M-Bus level converters, etc.

M-Bus interface

The gateway connects to the M-Bus system directly without requiring an external level converter.

Connection to the M-Bus is done by EIA485 connection. Notice that the the gateway is also powering the bus, so no

extra hardware is required to connect with M-Bus compatible meters or devices.

M-Bus signals

Intesis Modbus Server - M-Bus can read the following type of signals offered by M-Bus devices:

- Energy meters:

• Energy (kWh or J).

• Volume (m3, feet3, gallon).

• Power (kW or J/h).

• Volume flow (m3/h, m3/min or m3/s, gallon/h, gallon/min, gallon/s).

• Mass flow (kg/h).

• Flow Temperature (°C).

• Return Temperature (°C).

• Temperature difference (K).

• External Temperature (°C).

• Temp. limit (°C).

• Pressure (Bar).

• Vols (volts).

• Amps (amps).

• H.C.A., without units. (Multipurpose signal used, for example, by some energy meters to offer the readings

of auxiliary pulse counter inputs of the device).

• On Time, normally in hours but depends on the meter.

• Operating Time, normally in hours but depends on the meter.

• Averaging Duration, normally in hours but depends on the meter.

• Actuality Duration, normally in hours but depends on the meter.

• And others.