+ 44 1223 422345 info@amiho.co.uk

What is Wireless M-Bus?

The Wireless Meter-Bus (WM-Bus) communication protocol was developed to enable the wireless reading of gas and electricity meters, but is also applicable to any devices or things. Wireless M-Bus is a European Communication Standard based under EN 13757.

  • Metering Bus has been established as the basis for new Advanced Metering Infrastructures installations (AMI), allowing the two way communication between meters and data concentrators.
  • Wireless Meter Bus as such defines the wireless communication aspect of the interaction between meters and concentrators.
  • WM-Bus uses ISM license-free bands in the EU in the Sub-1-GHz spectrum and has been adopted for several Smart Metering roll-outs already, positioning it as cost effective, standardised and attractive solution. It uses primarily 868 MHz with the 433 and 169 MHz bands added in 2013.
Wireless Meter Bus Logo

IoT and Smart Meters

Smart meters are a prime example of a WM-Bus IoT Application. Smart Meters are electronic device which record the consumption of water, gas, electricity and heating, and communicate that information in regular intervals back to the utility (e.g. every hour or less) for monitoring and billing purpose.

Smart Meters offer various advantages to consumers and utility companies alike such as more accurate consumption reporting and billing, and the reduction of planned manual readings. Smart meters enable two-way communication, the main difference between Advanced Metering Infrastructure (AMI) and traditional automatic meter reading (AMR) allowing more complex interaction between meter and utility. Smart meters usually also send information to an in-house display so consumers can track their consumption.

Wireless M-Bus is also suitable for other applications where bi-directional communications is required.

OMS

The Open Metering System (OMS) is a cross-European initiative, with the mission to standardise Meter-Bus related types of communication between smart-meters and data concentrators and guarantee interoperability and future proof communication interface.

AMIHO technology is a dedicated member of the OMS Group and all the Wireless M-Bus products we currently offer are OMS compatible.

Communication Modes

The Wireless M-Bus standard offers a wide choice of communication modes between end-device and concentrator which will depend on the applications requirement. Each of these specific modes individually defines the communication flow and the configuration of the radio channel.

Primary Communication Modes

Mode

 

Typical Application

 

Meter

 

Concentrator

 

S1

Stationary Mode

Transmit only meter for stationary receiving readout

S2

All meter Types, Stationary Readout

T1

Frequent Transmit Mode

Frequent Transmission (Short Frame meters)

T2

Frequent transmission (short frame meter with two way capability)

R2

Frequent Receive Mode

Frequent Reception

(Long Range)

C1

Compact Mode

Frequent Transmit Only meter for mobile or stationary readout

C2

Frequent transmit meter for mobile or stationary readout

N1a-f

Long Range Mode

Long range transmit for stationary readout

N2a-f

Long Range two way communication for stationary  readout